9:08 p.m.
For those who don't care about the removed cpu, data of offline cpu is
bothering. This patchset is trying to hide data of offline cpu. Please
check each patch to see what is hiden.
The last version is here:
https://www.redhat.com/archives/crash-utility/2014-September/msg00000.html
Changelog:
v1->v2:
1. patch 1: add environment variable and its argument to hide/show
data of offline cpu.
2. add description of environment variable to crash.8
3. remove the restrict of x86_64
4. add "<OFFLINE>" to indicate those hiden data.
5. patch 22/23: addd "<OFFLINE>" to indicate idle task on offline
cpu
Qiao Nuohan (25):
add a flag to display/hide data of offline cpus
add an API to check whether to hide a cpus' data
x86_64: modify help -m/-M to hide offline cpus' data
x86_64: modify bt -E to hide offline cpus' data
x86_64: modify mach to hide offline cpus' data
x86_64: modify mach -c to hide offline cpus' data
modify help -r to hide offline cpus' registers
modify bt -c to hide offline cpus' data
modify display_sys_stats() to hide cpus' number
modify help -k to hide offline cpus' number
modify set -c to hide offline cpu
modify irq -s to hide offline cpus' data
modify irq -a to hide offline cpus' data
modify timer -r to hide offline cpus' data
modify timer to hide offline cpus' data
modify ptov offset:cpuspec to hide offline cpus' data
fix max_cpudata_limit() when offlined cpu exists
modify kmem -o to hide offline cpus' data
modify kmem -S(SLUB) to hide offline cpus' data
modify struct/union/* [:cpuspec] to hide offline cpus' data
modify command p to hide offline cpus' data
modify ps to indicate idle task on offline cpu
modify print_task_header() to indicate idle task on offline cpu
modify ps -l/-m -C cpu to hide offline cpus' data
modify runq to hide offline cpus' data
crash.8 | 4 +++
defs.h | 3 ++
diskdump.c | 6 +++-
help.c | 6 ++++
kernel.c | 83 +++++++++++++++++++++++++++++++++++++++++++++++++----
main.c | 15 +++++++++-
memory.c | 30 +++++++++++++++----
netdump.c | 25 ++++++++++++++--
symbols.c | 15 +++++++++-
task.c | 97 ++++++++++++++++++++++++++++++++++++++++++++++++++++----------
tools.c | 15 ++++++++++
x86_64.c | 74 +++++++++++++++++++++++++++++++++++++++--------
12 files changed, 331 insertions(+), 42 deletions(-)
--
1.8.5.3
9:08 p.m.
New subject: [PATCH v2 01/25] add a flag to display/hide data of offline cpus
Add a field to pc->flags2 to display/hide data related to offline cpu. This
flag can be changed by the following 2 ways:
1. start crash with "--offline [show|hide]"
2. execute crash command "set offline show|hide"
The default set is "show". This flag can be used by later patches to hide
date related to offline cpus. And set can be checked by using command "set -v"
Signed-off-by: Qiao Nuohan <qiaonuohan(a)cn.fujitsu.com>
---
crash.8 | 4 ++++
defs.h | 1 +
help.c | 6 ++++++
main.c | 15 ++++++++++++++-
tools.c | 15 +++++++++++++++
5 files changed, 40 insertions(+), 1 deletion(-)
diff --git a/crash.8 b/crash.8
index 1223aeb..bebffba 100644
--- a/crash.8
+++ b/crash.8
@@ -503,6 +503,10 @@ determined value.
.TP
.BI --kvmio \ <size>
override the automatically-calculated KVM guest I/O hole size.
+.TP
+.BI --offline \ [show|hide]
+Display/hide data related to offline cpu. Crash command "set offline
+[on|off]" can be used to override the set here.
.SH COMMANDS
Each
.B crash
diff --git a/defs.h b/defs.h
index cbdaa47..32c9d4d 100755
--- a/defs.h
+++ b/defs.h
@@ -505,6 +505,7 @@ struct program_context {
#define REM_PAUSED_F (0x1000ULL)
#define RAMDUMP (0x2000ULL)
#define REMOTE_PAUSED() (pc->flags2 & REM_PAUSED_F)
+#define OFFLINE_HIDE (0x4000ULL)
char *cleanup;
char *namelist_orig;
char *namelist_debug_orig;
diff --git a/help.c b/help.c
index 30d7759..a6f834d 100755
--- a/help.c
+++ b/help.c
@@ -339,6 +339,10 @@ char *program_usage_info[] = {
" --kvmio <size>",
" override the automatically-calculated KVM guest I/O hole size.",
"",
+ " --offline [show|hide]",
+ " Display/hide data related to offline cpu. Crash command \"set
offline",
+ " [show|hide]\" can be used to override the set here",
+ "",
"FILES:",
"",
" .crashrc",
@@ -1054,6 +1058,8 @@ char *help_set[] = {
" must be a kernel or module text address,
which",
" may be expressed symbolically or as a
hexadecimal",
" value.",
+" offline show | hide set crash to display or hide data related to",
+" offline cpu.",
" ",
" Internal variables may be set in four manners:\n",
" 1. entering the set command in $HOME/.%src.",
diff --git a/main.c b/main.c
index ad66058..8917f0f 100755
--- a/main.c
+++ b/main.c
@@ -70,6 +70,7 @@ static struct option long_options[] = {
{"dec", 0, 0, 0},
{"no_strip", 0, 0, 0},
{"hash", required_argument, 0, 0},
+ {"offline", required_argument, 0, 0},
{0, 0, 0, 0}
};
@@ -279,7 +280,17 @@ main(int argc, char **argv)
pc->flags2 |= RADIX_OVERRIDE;
pc->output_radix = 10;
}
-
+
+ else if (STREQ(long_options[option_index].name, "offline")) {
+ if (STREQ(optarg, "show"))
+ pc->flags2 &= ~OFFLINE_HIDE;
+ else if (STREQ(optarg, "hide"))
+ pc->flags2 |= OFFLINE_HIDE;
+ else {
+ error(INFO, "invalid --offline argument: %s\n", optarg);
+ program_usage(SHORT_FORM);
+ }
+ }
else {
error(INFO, "internal error: option %s unhandled\n",
@@ -1393,6 +1404,8 @@ dump_program_context(void)
fprintf(fp, "%sALLOW_FP", others++ ? "|" : "");
if (pc->flags2 & RAMDUMP)
fprintf(fp, "%sRAMDUMP", others++ ? "|" : "");
+ if (pc->flags2 & OFFLINE_HIDE)
+ fprintf(fp, "%sOFFLINE_HIDE", others++ ? "|" : "");
fprintf(fp, ")\n");
fprintf(fp, " namelist: %s\n", pc->namelist);
diff --git a/tools.c b/tools.c
index a5f514f..f9c97a4 100755
--- a/tools.c
+++ b/tools.c
@@ -2365,6 +2365,20 @@ cmd_set(void)
"on" : "off");
return;
+ } else if (STREQ(args[optind], "offline")) {
+
+ if (args[optind+1]) {
+ optind++;
+ if (STREQ(args[optind], "show"))
+ pc->flags2 &= ~OFFLINE_HIDE;
+ else if(STREQ(args[optind], "hide"))
+ pc->flags2 |= OFFLINE_HIDE;
+ else
+ goto invalid_set_command;
+ }
+
+ return;
+
} else if (XEN_HYPER_MODE()) {
error(FATAL, "invalid argument for the Xen hypervisor\n");
} else if (pc->flags & MINIMAL_MODE) {
@@ -2467,6 +2481,7 @@ show_options(void)
fprintf(fp, "(%s)\n", value_to_symstr(pc->scope, buf, 0));
else
fprintf(fp, "(not set)\n");
+ fprintf(fp, " offline: %s\n", pc->flags2 & OFFLINE_HIDE ?
"hide" : "show");
}
--
1.8.5.3
9:09 p.m.
New subject: [PATCH v2 02/25] add an API to check whether to hide a cpus' data
check_offline_cpu() is used to check whether a cpu is offline.
hide_offline_cpu() is based on check_offline_cpu() and used to check
whether the data related to the specified cpu should be hiden.
---
defs.h | 2 ++
kernel.c | 27 +++++++++++++++++++++++++++
2 files changed, 29 insertions(+)
diff --git a/defs.h b/defs.h
index 32c9d4d..0cf4f31 100755
--- a/defs.h
+++ b/defs.h
@@ -4894,6 +4894,8 @@ int get_cpus_online(void);
int get_cpus_active(void);
int get_cpus_present(void);
int get_cpus_possible(void);
+int check_offline_cpu(int);
+int hide_offline_cpu(int);
int get_highest_cpu_online(void);
int get_highest_cpu_present(void);
int get_cpus_to_display(void);
diff --git a/kernel.c b/kernel.c
index 87a0b75..8948c84 100755
--- a/kernel.c
+++ b/kernel.c
@@ -7989,6 +7989,33 @@ get_cpus_online()
}
/*
+ * check to see whether a cpu is offline
+ */
+int
+check_offline_cpu(int cpu)
+{
+ if (!cpu_map_addr("online"))
+ return FALSE;
+
+ if (in_cpu_map(ONLINE_MAP, cpu))
+ return FALSE;
+
+ return TRUE;
+}
+
+/*
+ * check to see whether the data related to the specified cpu should be hide
+ */
+int
+hide_offline_cpu(int cpu)
+{
+ if (!(pc->flags2 & OFFLINE_HIDE))
+ return FALSE;
+
+ return check_offline_cpu(cpu);
+}
+
+/*
* If it exists, return the highest cpu number in the cpu_online_map.
*/
int
--
1.8.5.3
9:09 p.m.
New subject: [PATCH v2 03/25] x86_64: modify help -m/-M to hide offline cpus' data
help -m/-M will display current task address/crash nmi rsp/exception
stack/irq stack on x86_64, and these data of offline cpu can be hide
with this patch.
The original display is like below:
<cut>
crash> help -m
...
current[4]:
ffffffff818d5440 ffff88003dad4fa0 ffff88003dad5b00 ffff88003dad6660
crash_nmi_rsp[4]:
0000000000000000 0000000000000000 0000000000000000 0000000000000000
...
ebase[cpus][7]:
[0]: ffff88003fc04000 ffff88003fc05000 ffff88003fc06000 ffff88003fc07000
ffff88003fc09000 0000000000000000 0000000000000000
[1]: ffff88003fc84000 ffff88003fc85000 ffff88003fc86000 ffff88003fc87000
ffff88003fc89000 0000000000000000 0000000000000000
[2]: ffff88003fd04000 ffff88003fd05000 ffff88003fd06000 ffff88003fd07000
ffff88003fd09000 0000000000000000 0000000000000000
[3]: ffff88003fd84000 ffff88003fd85000 ffff88003fd86000 ffff88003fd87000
ffff88003fd89000 0000000000000000 0000000000000000
ibase[cpus]:
ffff88003fc00000 ffff88003fc80000 ffff88003fd00000 ffff88003fd80000
<cut>
And with data of offline cpu hiden, the display will be like below:
<cut>
crash> help -m
...
current[4]:
ffffffff818d5440 ffff88003dad4fa0 <OFFLINE> ffff88003dad6660
crash_nmi_rsp[4]:
0000000000000000 0000000000000000 <OFFLINE> 0000000000000000
...
ebase[cpus][7]:
[0]: ffff88003fc04000 ffff88003fc05000 ffff88003fc06000 ffff88003fc07000
ffff88003fc09000 0000000000000000 0000000000000000
[1]: ffff88003fc84000 ffff88003fc85000 ffff88003fc86000 ffff88003fc87000
ffff88003fc89000 0000000000000000 0000000000000000
[2]: <OFFLINE>
[3]: ffff88003fd84000 ffff88003fd85000 ffff88003fd86000 ffff88003fd87000
ffff88003fd89000 0000000000000000 0000000000000000
ibase[cpus]:
ffff88003fc00000 ffff88003fc80000 <OFFLINE> ffff88003fd80000
<cut>
Signed-off-by: Qiao Nuohan <qiaonuohan(a)cn.fujitsu.com>
---
x86_64.c | 29 ++++++++++++++++++++++++++---
1 file changed, 26 insertions(+), 3 deletions(-)
diff --git a/x86_64.c b/x86_64.c
index a2e4636..9aa6432 100755
--- a/x86_64.c
+++ b/x86_64.c
@@ -764,10 +764,16 @@ x86_64_dump_machdep_table(ulong arg)
fprintf(fp, "%s current[%d]:%s",
space(CPU_SPACES(kt->cpus)), kt->cpus,
ms->current ? "\n " : " (unused)\n");
+
for (c = 0; ms->current && (c < kt->cpus); c++) {
if (c && !(c%4))
fprintf(fp, "\n ");
- fprintf(fp, "%016lx ", ms->current[c]);
+
+ if (hide_offline_cpu(c))
+ fprintf(fp, " <OFFLINE> ");
+ else
+ fprintf(fp, "%016lx ", ms->current[c]);
+
}
if (ms->current)
fprintf(fp, "\n");
@@ -775,10 +781,15 @@ x86_64_dump_machdep_table(ulong arg)
fprintf(fp, "%s crash_nmi_rsp[%d]:%s",
space(CPU_SPACES(kt->cpus)), kt->cpus,
ms->crash_nmi_rsp ? "\n " : " (unused)\n");
+
for (c = 0; ms->crash_nmi_rsp && (c < kt->cpus); c++) {
if (c && !(c%4))
fprintf(fp, "\n ");
- fprintf(fp, "%016lx ", ms->crash_nmi_rsp[c]);
+
+ if (hide_offline_cpu(c))
+ fprintf(fp, " <OFFLINE> ");
+ else
+ fprintf(fp, "%016lx ", ms->crash_nmi_rsp[c]);
}
if (ms->crash_nmi_rsp)
fprintf(fp, "\n");
@@ -803,6 +814,12 @@ x86_64_dump_machdep_table(ulong arg)
cpus = arg ? NR_CPUS : kt->cpus;
for (c = 0; c < cpus; c++) {
fprintf(fp, "\n %s[%d]: ", c < 10 ? " " : "", c);
+
+ if (!arg && hide_offline_cpu(c)) {
+ fprintf(fp, "<OFFLINE>");
+ continue;
+ }
+
for (i = 0; i < MAX_EXCEPTION_STACKS; i++) {
fprintf(fp, "%016lx ", ms->stkinfo.ebase[c][i]);
if (i == 3)
@@ -811,10 +828,16 @@ x86_64_dump_machdep_table(ulong arg)
}
fprintf(fp, "\n ibase[%s]:\n ",
arg ? "NR_CPUS" : "cpus");
+
for (c = 0; c < cpus; c++) {
if (c && !(c%4))
fprintf(fp, "\n ");
- fprintf(fp, "%016lx ", ms->stkinfo.ibase[c]);
+
+ if (!arg && hide_offline_cpu(c))
+ fprintf(fp, " <OFFLINE> ");
+ else
+ fprintf(fp, "%016lx ", ms->stkinfo.ibase[c]);
+
}
fprintf(fp, "\n");
}
--
1.8.5.3
9:09 p.m.
New subject: [PATCH v2 04/25] x86_64: modify bt -E to hide offline cpus' data
bt -E will search all irq stacks and exception stacks for possible
exception frames. With this patch offline cpus will be hiden.
The original output will be like:
<cut>
crash> bt -E
CPU 0 IRQ STACK:
(none found)
CPU 1 IRQ STACK:
(none found)
CPU 2 IRQ STACK:
(none found)
CPU 3 IRQ STACK:
(none found)
...
CPU 2 STACKFAULT EXCEPTION STACK:
(none found)
CPU 2 DOUBLEFAULT EXCEPTION STACK:
(none found)
CPU 2 NMI EXCEPTION STACK:
(none found)
CPU 2 DEBUG EXCEPTION STACK:
(none found)
CPU 2 MCE EXCEPTION STACK:
(none found)
...
<cut>
With data of offline cpu hiden, the output is like:
<cut>
crash> bt -E
CPU 0 IRQ STACK:
(none found)
CPU 1 IRQ STACK:
(none found)
CPU 2 IRQ STACK: <OFFLINE>
CPU 3 IRQ STACK:
(none found)
...
CPU 2 STACKFAULT EXCEPTION STACK: <OFFLINE>
CPU 2 DOUBLEFAULT EXCEPTION STACK: <OFFLINE>
CPU 2 NMI EXCEPTION STACK: <OFFLINE>
CPU 2 DEBUG EXCEPTION STACK: <OFFLINE>
CPU 2 MCE EXCEPTION STACK: <OFFLINE>
...
<cut>
Signed-off-by: Qiao Nuohan <qiaonuohan(a)cn.fujitsu.com>
---
x86_64.c | 18 ++++++++++++++++--
1 file changed, 16 insertions(+), 2 deletions(-)
diff --git a/x86_64.c b/x86_64.c
index 9aa6432..19f2d48 100755
--- a/x86_64.c
+++ b/x86_64.c
@@ -2348,7 +2348,14 @@ x86_64_eframe_search(struct bt_info *bt)
if (ms->stkinfo.ibase[c] == 0)
break;
bt->hp->esp = ms->stkinfo.ibase[c];
- fprintf(fp, "CPU %d IRQ STACK:\n", c);
+ fprintf(fp, "CPU %d IRQ STACK:", c);
+
+ if (hide_offline_cpu(c)) {
+ fprintf(fp, " <OFFLINE>\n\n");
+ continue;
+ } else
+ fprintf(fp, "\n");
+
if ((cnt = x86_64_eframe_search(bt)))
fprintf(fp, "\n");
else
@@ -2360,8 +2367,15 @@ x86_64_eframe_search(struct bt_info *bt)
if (ms->stkinfo.ebase[c][i] == 0)
break;
bt->hp->esp = ms->stkinfo.ebase[c][i];
- fprintf(fp, "CPU %d %s EXCEPTION STACK:\n",
+ fprintf(fp, "CPU %d %s EXCEPTION STACK:",
c, x86_64_exception_stacks[i]);
+
+ if (hide_offline_cpu(c)) {
+ fprintf(fp, " <OFFLINE>\n\n");
+ continue;
+ } else
+ fprintf(fp, "\n");
+
if ((cnt = x86_64_eframe_search(bt)))
fprintf(fp, "\n");
else
--
1.8.5.3
9:09 p.m.
New subject: [PATCH v2 05/25] x86_64: modify mach to hide offline cpus' data
mach will display number of cpus and cpus' irq stacks and exception
stacks. This patch can hide offline cpus.
The original output is like below:
<cut>
crash> mach
MACHINE TYPE: x86_64
MEMORY SIZE: 1 GB
CPUS: 4
...
IRQ STACKS:
CPU 0: ffff88003fc00000
CPU 1: ffff88003fc80000
CPU 2: ffff88003fd00000
CPU 3: ffff88003fd80000
STACKFAULT STACK SIZE: 4096
STACKFAULT STACKS:
CPU 0: ffff88003fc04000
CPU 1: ffff88003fc84000
CPU 2: ffff88003fd04000
CPU 3: ffff88003fd84000
..
<cut>
With data of offline cpu hiden, the output is like below:
<cut>
crash> mach
MACHINE TYPE: x86_64
MEMORY SIZE: 1 GB
CPUS: 3
...
IRQ STACKS:
CPU 0: ffff88003fc00000
CPU 1: ffff88003fc80000
CPU 2: <OFFLINE>
CPU 3: ffff88003fd80000
STACKFAULT STACK SIZE: 4096
STACKFAULT STACKS:
CPU 0: ffff88003fc04000
CPU 1: ffff88003fc84000
CPU 2: <OFFLINE>
CPU 3: ffff88003fd84000
...
<cut>
Signed-off-by: Qiao Nuohan <qiaonuohan(a)cn.fujitsu.com>
---
x86_64.c | 18 +++++++++++++-----
1 file changed, 13 insertions(+), 5 deletions(-)
diff --git a/x86_64.c b/x86_64.c
index 19f2d48..69d7ea8 100755
--- a/x86_64.c
+++ b/x86_64.c
@@ -5070,7 +5070,7 @@ x86_64_display_machine_stats(void)
fprintf(fp, " MACHINE TYPE: %s\n", uts->machine);
fprintf(fp, " MEMORY SIZE: %s\n", get_memory_size(buf));
- fprintf(fp, " CPUS: %d\n", kt->cpus);
+ fprintf(fp, " CPUS: %d\n", get_cpus_to_display());
if (!STREQ(kt->hypervisor, "(undetermined)") &&
!STREQ(kt->hypervisor, "bare hardware"))
fprintf(fp, " HYPERVISOR: %s\n", kt->hypervisor);
@@ -5094,8 +5094,12 @@ x86_64_display_machine_stats(void)
fprintf(fp, " IRQ STACKS:\n");
for (c = 0; c < kt->cpus; c++) {
sprintf(buf, "CPU %d", c);
- fprintf(fp, "%22s: %016lx\n",
- buf, machdep->machspec->stkinfo.ibase[c]);
+
+ if (hide_offline_cpu(c))
+ fprintf(fp, "%22s: <OFFLINE>\n", buf);
+ else
+ fprintf(fp, "%22s: %016lx\n",
+ buf, machdep->machspec->stkinfo.ibase[c]);
}
for (i = 0; i < MAX_EXCEPTION_STACKS; i++) {
@@ -5110,8 +5114,12 @@ x86_64_display_machine_stats(void)
if (machdep->machspec->stkinfo.ebase[c][i] == 0)
break;
sprintf(buf, "CPU %d", c);
- fprintf(fp, "%22s: %016lx\n",
- buf, machdep->machspec->stkinfo.ebase[c][i]);
+
+ if (hide_offline_cpu(c))
+ fprintf(fp, "%22s: <OFFLINE>\n", buf);
+ else
+ fprintf(fp, "%22s: %016lx\n",
+ buf, machdep->machspec->stkinfo.ebase[c][i]);
}
}
}
--
1.8.5.3
9:09 p.m.
New subject: [PATCH v2 06/25] x86_64: modify mach -c to hide offline cpus' data
mach -c will display some per-cpu structures. This patch will hide
offline cpus' structures.
The original output is like below:
<cut>
crash> mach -c
...
cpu_index = 1,
microcode = 1
}
CPU 2:
struct cpuinfo_x86 {
x86 = 6 '\006',
x86_vendor = 0 '\000',
x86_model = 2 '\002',
x86_mask = 3 '\003',
x86_tlbsize = 0,
x86_virt_bits = 48 '0',
x86_phys_bits = 40 '(',
...
<cut>
With data of offline cpu(cpu #2) hiden, the output is like below:
<cut>
crash> mach -c
...
cpu_index = 1,
microcode = 1
}
CPU 2: <OFFLINE>
CPU 3:
struct cpuinfo_x86 {
struct cpuinfo_x86 {
x86 = 6 '\006',
x86_vendor = 0 '\000',
x86_model = 2 '\002',
x86_mask = 3 '\003',
x86_tlbsize = 0,
...
<cut>
Signed-off-by: Qiao Nuohan <qiaonuohan(a)cn.fujitsu.com>
---
x86_64.c | 9 +++++++--
1 file changed, 7 insertions(+), 2 deletions(-)
diff --git a/x86_64.c b/x86_64.c
index 69d7ea8..473ea8b 100755
--- a/x86_64.c
+++ b/x86_64.c
@@ -5163,8 +5163,13 @@ x86_64_display_cpu_data(unsigned int radix)
for (cpu = 0; cpu < cpus; cpu++) {
if (boot_cpu)
fprintf(fp, "BOOT CPU:\n");
- else
- fprintf(fp, "%sCPU %d:\n", cpu ? "\n" :
"", cpu);
+ else {
+ if (hide_offline_cpu(cpu)) {
+ fprintf(fp, "%sCPU %d: <OFFLINE>\n", cpu ? "\n" :
"", cpu);
+ continue;
+ } else
+ fprintf(fp, "%sCPU %d:\n", cpu ? "\n" : "", cpu);
+ }
if (per_cpu)
cpu_data = per_cpu->value + kt->__per_cpu_offset[cpu];
--
1.8.5.3
9:09 p.m.
New subject: [PATCH v2 07/25] modify help -r to hide offline cpus' registers
help -r can display registers on three types of vmcore:
1. qemu memoly-only dump
2. kdump(kdump-compressed format)
3. kdump(elf format)
This patch will hide the offline cpus' registers.
With data of offline cpu hiden, the output is like below
1. qemu memory-only dump, cpu#1 and cpu#2 are offline
<cut>
...
idt:
selector:00000000 limit:00000fff flags:00000000
pad:00000000 base:ffffffffff529000
cr[0]:000000008005003b cr[1]:0000000000000000 cr[2]:00007f6885fa3000
cr[3]:000000003b481000 cr[4]:00000000000006f0
CPU 1: <OFFLINE>
CPU 2: <OFFLINE>
CPU 3:
rax:00000000ffffffed rbx:ffff88003daeffd8 rcx:0100000000000000
rdx:0000000000000000 rsi:0000000000000000 rdi:0000000000000046
rsp:ffff88003daefe98 rbp:ffff88003daefe98 r8:0000000000000000
r9:0000000000000000 r10:0000000000000013 r11:ffff88003db45028
r12:0000000000000003 r13:ffff88003daeffd8 r14:0000000000000000
r15:ffff88003daeffd8 rip:ffffffff81046346 rflags:00000286
...
<cut>
2. kdump(kdump-compressed format), cpu#2 is offline
<cut>
...
CPU 1:
RIP: ffffffff8134b6c6 RSP: ffff88003df25e18 RFLAGS: 00010096
RAX: 0000000000000010 RBX: 0000000000000063 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000063
RBP: ffff88003df25e18 R8: 0000000000000000 R9: ffffffff81645da0
R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000000
R13: ffffffff81b01a40 R14: 0000000000000286 R15: 0000000000000004
CS: 0010 SS: 0018
CPU 2: <OFFLINE>
CPU 3:
RIP: ffffffff81015670 RSP: ffff88003f3fdca0 RFLAGS: 00000097
RAX: 0000000000000000 RBX: 000000000000001f RCX: 0000000000000000
RDX: 00000000000003d5 RSI: 000000000000001f RDI: ffffffff81fdd2a8
...
<cut>
3. kdump(elf format), cpu #1 is offline
<cut>
...
RBP: ffffffff818c3e98 R8: 0000000000000000 R9: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: ffffffff818c3fd8 R14: ffff88003ff54780 R15: ffffffff818c3fd8
CS: 0010 SS: 0018
CPU 1: <OFFLINE>
CPU 2:
RIP: ffffffff81046346 RSP: ffff88003daede98 RFLAGS: 00000286
RAX: 00000000ffffffed RBX: ffff88003daedfd8 RCX: 0100000000000000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000046
RBP: ffff88003daede98 R8: 0000000000000000 R9: 0000000000000000
...
<cut>
Signed-off-by: Qiao Nuohan <qiaonuohan(a)cn.fujitsu.com>
---
diskdump.c | 6 +++++-
netdump.c | 25 +++++++++++++++++++++++--
2 files changed, 28 insertions(+), 3 deletions(-)
diff --git a/diskdump.c b/diskdump.c
index 7639e32..08216ab 100644
--- a/diskdump.c
+++ b/diskdump.c
@@ -2057,7 +2057,11 @@ dump_registers_for_compressed_kdump(void)
error(FATAL, "-r option not supported for this dumpfile\n");
for (c = 0; c < kt->cpus; c++) {
- fprintf(fp, "%sCPU %d:\n", c ? "\n" : "", c);
+ if (hide_offline_cpu(c)) {
+ fprintf(fp, "%sCPU %d: <OFFLINE>\n", c ? "\n" :
"", c);
+ continue;
+ } else
+ fprintf(fp, "%sCPU %d:\n", c ? "\n" : "", c);
diskdump_display_regs(c, fp);
}
}
diff --git a/netdump.c b/netdump.c
index e946b45..9cce479 100644
--- a/netdump.c
+++ b/netdump.c
@@ -2380,8 +2380,19 @@ display_regs_from_elf_notes(int cpu)
Elf64_Nhdr *note64;
size_t len;
char *user_regs;
+ int c, skipped_count;
- if (cpu >= nd->num_prstatus_notes) {
+ /*
+ * NT_PRSTATUS notes are only related to online cpus, offline cpus
+ * should be skipped.
+ */
+ skipped_count = 0;
+ for (c = 0; c < cpu; c++) {
+ if (check_offline_cpu(c))
+ skipped_count++;
+ }
+
+ if ((cpu - skipped_count) >= nd->num_prstatus_notes) {
error(INFO, "registers not collected for cpu %d\n", cpu);
return;
}
@@ -2488,6 +2499,11 @@ dump_registers_for_elf_dumpfiles(void)
}
for (c = 0; c < kt->cpus; c++) {
+ if (check_offline_cpu(c)) {
+ fprintf(fp, "%sCPU %d: <OFFLINE>\n", c ? "\n" :
"", c);
+ continue;
+ }
+
fprintf(fp, "%sCPU %d:\n", c ? "\n" : "",
c);
display_regs_from_elf_notes(c);
}
@@ -3786,7 +3802,12 @@ dump_registers_for_qemu_mem_dump(void)
if (i)
netdump_print("\n");
- netdump_print("CPU %d:\n", i);
+
+ if (hide_offline_cpu(i)) {
+ netdump_print("CPU %d: <OFFLINE>\n", i);
+ continue;
+ } else
+ netdump_print("CPU %d:\n", i);
if (CRASHDEBUG(1))
netdump_print(" version:%08lx size:%08lx\n",
--
1.8.5.3
9:09 p.m.
New subject: [PATCH v2 08/25] modify bt -c to hide offline cpus' data
bt -c will display the stack trace of the active task on specified cpus.
This patch will hide offline cpus' data and print a message like "bt:
CPU xx is offline" to indicate the hide(xx is the id of the offline cpu).
The original output is like below:
<cut>
crash> bt -c 2,3
PID: 0 TASK: ffff88003f380040 CPU: 2 COMMAND: "swapper"
#0 [ffff88003f3adf00] cpu_idle at ffffffff8100a00b
PID: 22 TASK: ffff88003f3fb500 CPU: 3 COMMAND: "events/3"
#0 [ffff880002387e90] crash_nmi_callback at ffffffff8102fee6
#1 [ffff880002387ea0] notifier_call_chain at ffffffff8152d515
#2 [ffff880002387ee0] atomic_notifier_call_chain at ffffffff8152d57a
#3 [ffff880002387ef0] notify_die at ffffffff810a154e
#4 [ffff880002387f20] do_nmi at ffffffff8152b1db
#5 [ffff880002387f50] nmi at ffffffff8152aaa0
...
<cut>
With data of offline cpu(cpu #2) hiden, the output is like below:
<cut>
crash> bt -c 2,3
bt: CPU 2 is OFFLINE.
PID: 22 TASK: ffff88003f3fb500 CPU: 3 COMMAND: "events/3"
#0 [ffff880002387e90] crash_nmi_callback at ffffffff8102fee6
#1 [ffff880002387ea0] notifier_call_chain at ffffffff8152d515
#2 [ffff880002387ee0] atomic_notifier_call_chain at ffffffff8152d57a
#3 [ffff880002387ef0] notify_die at ffffffff810a154e
#4 [ffff880002387f20] do_nmi at ffffffff8152b1db
...
<cut>
Signed-off-by: Qiao Nuohan <qiaonuohan(a)cn.fujitsu.com>
---
kernel.c | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/kernel.c b/kernel.c
index 8948c84..f5f98ca 100755
--- a/kernel.c
+++ b/kernel.c
@@ -2261,6 +2261,12 @@ cmd_bt(void)
for (i = 0; i < kt->cpus; i++) {
if (NUM_IN_BITMAP(cpus, i)) {
+ if (hide_offline_cpu(i)) {
+ error(INFO, "%sCPU %d is OFFLINE.\n",
+ subsequent++ ? "\n" : "", i);
+ continue;
+ }
+
if ((task = get_active_task(i)))
tc = task_to_context(task);
else
--
1.8.5.3
9:09 p.m.
New subject: [PATCH v2 09/25] modify display_sys_stats() to hide cpus' number
function display_sys_stats will display the cpus' total number at initiation
when crash is executed or when command sys is called. With this patch, only
the total number of online cpus will be displayed.
The has 4 cpus and cpu#2 is offline. The original display is like below:
<cut>
KERNEL: ../kdump/vmlinux
DUMPFILE: ../kdump/vmcore [PARTIAL DUMP]
CPUS: 4
DATE: Tue Sep 23 14:54:26 2014
UPTIME: 00:02:45
...
<cut>
With this patch, the output is like below:
<cut>
KERNEL: ../kdump/vmlinux
DUMPFILE: ../kdump/vmcore [PARTIAL DUMP]
CPUS: 3
DATE: Tue Sep 23 14:54:26 2014
UPTIME: 00:02:45
...
<cut>
Signed-off-by: Qiao Nuohan <qiaonuohan(a)cn.fujitsu.com>
---
kernel.c | 3 +--
1 file changed, 1 insertion(+), 2 deletions(-)
diff --git a/kernel.c b/kernel.c
index f5f98ca..8f34a3e 100755
--- a/kernel.c
+++ b/kernel.c
@@ -4796,8 +4796,7 @@ display_sys_stats(void)
pc->kvmdump_mapfile);
}
- fprintf(fp, " CPUS: %d\n",
- machine_type("PPC64") ? get_cpus_to_display() : kt->cpus);
+ fprintf(fp, " CPUS: %d\n", get_cpus_to_display());
if (ACTIVE())
get_xtime(&kt->date);
fprintf(fp, " DATE: %s\n",
--
1.8.5.3
9:09 p.m.
New subject: [PATCH v2 10/25] modify help -k to hide offline cpus' number
help -k will display total number of cpus. This patch skips offline
cpu and only calculates online cpus' number.
The original output is like below:
<cut>
crash> help -k
...
cpus: 4
...
<cut>
With data of offline cpu(cpu #2) hiden, the output like below:
<cut>
crash> help -k
...
cpus: 3
...
<cut>
Signed-off-by: Qiao Nuohan <qiaonuohan(a)cn.fujitsu.com>
---
kernel.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/kernel.c b/kernel.c
index 8f34a3e..f5bf011 100755
--- a/kernel.c
+++ b/kernel.c
@@ -5243,7 +5243,7 @@ dump_kernel_table(int verbose)
fprintf(fp, " init_begin: %lx\n", kt->init_begin);
fprintf(fp, " init_end: %lx\n", kt->init_end);
fprintf(fp, " end: %lx\n", kt->end);
- fprintf(fp, " cpus: %d\n", kt->cpus);
+ fprintf(fp, " cpus: %d\n", get_cpus_to_display());
fprintf(fp, " cpus_override: %s\n", kt->cpus_override);
fprintf(fp, " NR_CPUS: %d (compiled-in to this version of
%s)\n",
NR_CPUS, pc->program_name);
--
1.8.5.3
9:09 p.m.
New subject: [PATCH v2 11/25] modify set -c to hide offline cpu
With this patch and crash variable "offline" is hide(check command "set
-v"),
"set -c" is not able to set to an offline cpu and message like below will be
printed.
<cut>
crash> set -c 2
set invalid cpu number: cpu 2 is OFFLINE
<cut>
Signed-off-by: Qiao Nuohan <qiaonuohan(a)cn.fujitsu.com>
---
kernel.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/kernel.c b/kernel.c
index f5bf011..560b292 100755
--- a/kernel.c
+++ b/kernel.c
@@ -5482,6 +5482,10 @@ set_cpu(int cpu)
if (cpu >= kt->cpus)
error(FATAL, "invalid cpu number: system has only %d cpu%s\n",
kt->cpus, kt->cpus > 1 ? "s" : "");
+
+ if (hide_offline_cpu(cpu))
+ error(FATAL, "invalid cpu number: cpu %d is OFFLINE\n", cpu);
+
if ((task = get_active_task(cpu)))
set_context(task, NO_PID);
else
--
1.8.5.3
9:09 p.m.
New subject: [PATCH v2 12/25] modify irq -s to hide offline cpus' data
irq -s will display kernel irq stats. This patch will hide data of
offline cpus
The original output is like below:
<cut>
crash> irq -s
CPU0 CPU1 CPU2 CPU3
0: 111 1 0 0 IO-APIC-edge timer
1: 71 149 140 155 IO-APIC-edge i8042
8: 0 0 0 1 IO-APIC-edge rtc0
9: 0 0 0 0 IO-APIC-fasteoi acpi
...
<cut>
With data of offline cpu(cpu#2) hiden, the output is like below:
<cut>
crash> irq -s
irq: CPU2 is OFFLINE.
CPU0 CPU1 CPU3
0: 111 1 0 IO-APIC-edge timer
1: 71 149 155 IO-APIC-edge i8042
8: 0 0 1 IO-APIC-edge rtc0
9: 0 0 0 IO-APIC-fasteoi acpi
...
<cut>
Signed-off-by: Qiao Nuohan <qiaonuohan(a)cn.fujitsu.com>
---
kernel.c | 12 ++++++++++++
1 file changed, 12 insertions(+)
diff --git a/kernel.c b/kernel.c
index 560b292..758edcf 100755
--- a/kernel.c
+++ b/kernel.c
@@ -5622,9 +5622,18 @@ cmd_irq(void)
SET_BIT(cpus, i);
}
+ for (i = 0; i < kt->cpus; i++) {
+ if (NUM_IN_BITMAP(cpus, i) && hide_offline_cpu(i))
+ error(INFO, "CPU%d is OFFLINE.\n", i);
+ }
+
fprintf(fp, " ");
BZERO(buf, 10);
+
for (i = 0; i < kt->cpus; i++) {
+ if (hide_offline_cpu(i))
+ continue;
+
if (NUM_IN_BITMAP(cpus, i)) {
sprintf(buf, "CPU%d", i);
fprintf(fp, "%10s ", buf);
@@ -6422,6 +6431,9 @@ generic_show_interrupts(int irq, ulong *cpus)
fprintf(fp, "%3d: ", irq);
for (i = 0; i < kt->cpus; i++) {
+ if (hide_offline_cpu(i))
+ continue;
+
if (NUM_IN_BITMAP(cpus, i))
fprintf(fp, "%10u ", kstat_irqs[i]);
}
--
1.8.5.3
9:09 p.m.
New subject: [PATCH v2 13/25] modify irq -a to hide offline cpus' data
irq -a will dump cpu affinity for irqs. This patch will hide offline
cpus.
The original output is like below:
<cut>
crash> irq -a
IRQ NAME AFFINITY
0 timer 0-3
1 i8042 0
6 floppy 0-3
8 rtc0 0-3
...
<cut>
With data of offline cpu(cpu #2) hiden, the output is like below:
<cut>
crash> irq -a
IRQ NAME AFFINITY
0 timer 0-1,3
1 i8042 0
6 floppy 0-1,3
8 rtc0 0-1,3
...
<cut>
Signed-off-by: Qiao Nuohan <qiaonuohan(a)cn.fujitsu.com>
---
kernel.c | 12 ++++++++++--
1 file changed, 10 insertions(+), 2 deletions(-)
diff --git a/kernel.c b/kernel.c
index 758edcf..8063d61 100755
--- a/kernel.c
+++ b/kernel.c
@@ -5733,14 +5733,19 @@ get_irq_desc_addr(int irq)
static void
display_cpu_affinity(ulong *mask)
{
- int cpu, seq, start, count;
+ int cpu, seq, start, count, cpu_exist;
seq = FALSE;
start = 0;
count = 0;
for (cpu = 0; cpu < kt->cpus; ++cpu) {
- if (NUM_IN_BITMAP(mask, cpu)) {
+ /*
+ * on X86_64, offline cpu should not be displayed.
+ */
+ cpu_exist = !hide_offline_cpu(cpu) && NUM_IN_BITMAP(mask, cpu);
+
+ if (cpu_exist) {
if (seq)
continue;
start = cpu;
@@ -5757,6 +5762,9 @@ display_cpu_affinity(ulong *mask)
}
}
+ /*
+ * when seq is TRUE, the following cpus cannot be offline.
+ */
if (seq) {
if (count)
fprintf(fp, ",");
--
1.8.5.3
9:09 p.m.
New subject: [PATCH v2 14/25] modify timer -r to hide offline cpus' data
timer -r will display hrtimer. This patch will hide offline cpus.
The original output is like below:
<cut>
crash> timer -r
...
CLOCK: 2 HRTIMER_CLOCK_BASE: ffff88003fc8e800 [ktime_get_boottime]
(empty)
CPU: 2 HRTIMER_CPU_BASE: ffff88003fd0e740
CLOCK: 0 HRTIMER_CLOCK_BASE: ffff88003fd0e780 [ktime_get]
(empty)
CLOCK: 1 HRTIMER_CLOCK_BASE: ffff88003fd0e7c0 [ktime_get_real]
(empty)
CLOCK: 2 HRTIMER_CLOCK_BASE: ffff88003fd0e800 [ktime_get_boottime]
(empty)
CPU: 3 HRTIMER_CPU_BASE: ffff88003fd8e740
...
<cut>
With data of offline cpu(cpu #2) hiden, the output is like below:
<cut>
crash> timer -r
...
CLOCK: 2 HRTIMER_CLOCK_BASE: ffff88003fc8e800 [ktime_get_boottime]
(empty)
CPU: 2 <OFFLINE>
CPU: 3 HRTIMER_CPU_BASE: ffff88003fd8e740
...
<cut>
Signed-off-by: Qiao Nuohan <qiaonuohan(a)cn.fujitsu.com>
---
kernel.c | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/kernel.c b/kernel.c
index 8063d61..0665ada 100755
--- a/kernel.c
+++ b/kernel.c
@@ -6765,9 +6765,16 @@ dump_hrtimer_data(void)
option_not_supported('r');
hrtimer_bases = per_cpu_symbol_search("hrtimer_bases");
+
for (i = 0; i < kt->cpus; i++) {
if (i)
fprintf(fp, "\n");
+
+ if (hide_offline_cpu(i)) {
+ fprintf(fp, "CPU: %d <OFFLINE>\n", i);
+ continue;
+ }
+
fprintf(fp, "CPU: %d ", i);
if (VALID_STRUCT(hrtimer_clock_base)) {
fprintf(fp, "HRTIMER_CPU_BASE: %lx\n",
--
1.8.5.3
9:09 p.m.
New subject: [PATCH v2 15/25] modify timer to hide offline cpus' data
This patch will hide timer data of offline cpus.
The original output is like below:
<cut>
crash> timer
...
4310933504 ffffffffa0311750 ffffffff8154f790 <inet_frag_secret_rebuild>
4380688384 ffff880036dae568 ffffffff8157ed30 <ipv6_regen_rndid>
TVEC_BASES[2]: ffff88003db20000
JIFFIES
4310640297
EXPIRES TIMER_LIST FUNCTION
TVEC_BASES[3]: ffff88003db44000
JIFFIES
4310640297
...
<cut>
With data of offline cpu(cpu #2) hiden, the output is like below:
<cut>
crash> timer
...
4310933504 ffffffffa0311750 ffffffff8154f790 <inet_frag_secret_rebuild>
4380688384 ffff880036dae568 ffffffff8157ed30 <ipv6_regen_rndid>
TVEC_BASES[2]: <OFFLINE>
TVEC_BASES[3]: ffff88003db44000
JIFFIES
4310640297
...
<cut>
Signed-off-by: Qiao Nuohan <qiaonuohan(a)cn.fujitsu.com>
---
kernel.c | 10 ++++++++++
1 file changed, 10 insertions(+)
diff --git a/kernel.c b/kernel.c
index 0665ada..6da669e 100755
--- a/kernel.c
+++ b/kernel.c
@@ -7435,6 +7435,16 @@ dump_timer_data_tvec_bases_v2(void)
cpu = 0;
next_cpu:
+ /*
+ * hide data of offline cpu and goto next cpu
+ */
+
+ if (hide_offline_cpu(cpu)) {
+ fprintf(fp, "TVEC_BASES[%d]: <OFFLINE>\n", cpu);
+ if (++cpu < kt->cpus)
+ goto next_cpu;
+ }
+
count = 0;
td = (struct timer_data *)NULL;
--
1.8.5.3
9:09 p.m.
New subject: [PATCH v2 16/25] modify ptov offset:cpuspec to hide offline cpus' data
ptov offset:cpuspec can be used to translate per-cpu offset to kernel
virtual address. This patch will hide data of offline cpu.
The original output is like below:
<cut>
crash> ptov bfa0:a
PER-CPU OFFSET: bfa0
CPU VIRTUAL
[0] ffff88003fc0bfa0
[1] ffff88003fc8bfa0
[2] ffff88003fd0bfa0
[3] ffff88003fd8bfa0
<cut>
With data of offline cpu(cpu #2) hiden, the output is like below:
<cut>
crash> ptov bfa0:a
PER-CPU OFFSET: bfa0
CPU VIRTUAL
[0] ffff88003fc0bfa0
[1] ffff88003fc8bfa0
[2] <OFFLINE>
[3] ffff88003fd8bfa0
<cut>
Signed-off-by: Qiao Nuohan <qiaonuohan(a)cn.fujitsu.com>
---
memory.c | 10 +++++++---
1 file changed, 7 insertions(+), 3 deletions(-)
diff --git a/memory.c b/memory.c
index 518c917..fbbd01d 100755
--- a/memory.c
+++ b/memory.c
@@ -3192,9 +3192,13 @@ cmd_ptov(void)
continue;
vaddr = paddr + kt->__per_cpu_offset[c];
sprintf(buf1, "[%d]", c);
- fprintf(fp, " %s%lx\n",
- mkstring(buf2, len, LJUST, buf1),
- vaddr);
+
+ fprintf(fp, " %s",
+ mkstring(buf2, len, LJUST, buf1));
+ if (hide_offline_cpu(c))
+ fprintf(fp, "<OFFLINE>\n");
+ else
+ fprintf(fp, "%lx\n", vaddr);
}
FREEBUF(cpus);
} else {
--
1.8.5.3
9:09 p.m.
New subject: [PATCH v2 17/25] fix max_cpudata_limit() when offlined cpu exists
When determining the largest cpudata limit for kmem_cache, the member,
limit, of kmem_cache.array[NR_CPUS] is needed, and the process will
stop when kmem_cache.array[cpu] equals to NULL. However, when offline
cpus exist, kmem_cache.array[cpu] of offline cpus are alse NULL. Then
the process of determining the largest cpudata limit will ignore the
cpus after the offlined cpu.
This patch is used to fix the above problem.
Signed-off-by: Qiao Nuohan <qiaonuohan(a)cn.fujitsu.com>
---
memory.c | 8 +++++++-
1 file changed, 7 insertions(+), 1 deletion(-)
diff --git a/memory.c b/memory.c
index fbbd01d..6c7f495 100755
--- a/memory.c
+++ b/memory.c
@@ -9181,7 +9181,13 @@ kmem_cache_s_array_nodes:
"array cache array", RETURN_ON_ERROR))
goto bail_out;
- for (i = max_limit = 0; (i < kt->cpus) && cpudata[i]; i++) {
+ for (i = max_limit = 0; i < kt->cpus; i++) {
+ if (check_offline_cpu(i))
+ continue;
+
+ if (!cpudata[i])
+ break;
+
if (!readmem(cpudata[i]+OFFSET(array_cache_limit),
KVADDR, &limit, sizeof(int),
"array cache limit", RETURN_ON_ERROR)) {
--
1.8.5.3
9:09 p.m.
New subject: [PATCH v2 18/25] modify kmem -o to hide offline cpus' data
kmem -o is used to display each cpu's offset value that is added
to per-cpu symbol values to translate them into kernel virtual
addresses. This patch will hide data of offline cpus.
The original output is like below:
<cut>
crash> kmem -o
PER-CPU OFFSET VALUES:
CPU 0: ffff88003fc00000
CPU 1: ffff88003fc80000
CPU 2: ffff88003fd00000
CPU 3: ffff88003fd80000
<cut>
With data of offline cpu(cpu #2) hiden, the output is like below:
<cut>
crash> kmem -o
PER-CPU OFFSET VALUES:
CPU 0: ffff88003fc00000
CPU 1: ffff88003fc80000
CPU 2: <OFFLINE>
CPU 3: ffff88003fd80000
<cut>
Signed-off-by: Qiao Nuohan <qiaonuohan(a)cn.fujitsu.com>
---
memory.c | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)
diff --git a/memory.c b/memory.c
index 6c7f495..6b7289b 100755
--- a/memory.c
+++ b/memory.c
@@ -17016,7 +17016,12 @@ dump_per_cpu_offsets(void)
for (c = 0; c < kt->cpus; c++) {
sprintf(buf, "CPU %d", c);
- fprintf(fp, "%7s: %lx\n", buf, kt->__per_cpu_offset[c]);
+
+ fprintf(fp, "%7s: ", buf);
+ if (hide_offline_cpu(c))
+ fprintf(fp, "<OFFLINE>\n");
+ else
+ fprintf(fp, "%lx\n", kt->__per_cpu_offset[c]);
}
}
--
1.8.5.3
9:09 p.m.
New subject: [PATCH v2 19/25] modify kmem -S(SLUB) to hide offline cpus' data
if SLUB is configured, kmem -S will display per-cpu data. This patch
will hide data of offline cpu.
The original output is like below:
<cut>
crash> kmem -S
...
CPU 1 KMEM_CACHE_CPU:
ffff88003fc97360
CPU 1 SLAB:
SLAB MEMORY NODE TOTAL ALLOCATED FREE
ffffea0000dc0d40 ffff880037035000 0 16 11 5
FREE / [ALLOCATED]
[ffff880037035000]
[ffff880037035100]
...
[ffff88003c6e0f00]
CPU 2 KMEM_CACHE_CPU:
ffff88003fd17360
CPU 2 SLAB:
(empty)
CPU 2 PARTIAL:
(empty)
CPU 3 KMEM_CACHE_CPU:
ffff88003fd97360
CPU 3 SLAB:
SLAB MEMORY NODE TOTAL ALLOCATED FREE
ffffea0000ed8f80 ffff88003b63e000 0 16 13 3
FREE / [ALLOCATED]
[ffff88003b63e000]
...
<cut>
With data of offline cpu(cpu #2) hiden, the output is like below:
<cut>
crash> kmem -S
...
CPU 1 KMEM_CACHE_CPU:
ffff88003fc97360
CPU 1 SLAB:
SLAB MEMORY NODE TOTAL ALLOCATED FREE
ffffea0000dc0d40 ffff880037035000 0 16 11 5
FREE / [ALLOCATED]
[ffff880037035000]
[ffff880037035100]
...
[ffff88003c6e0f00]
CPU 2 <OFFLINE>
CPU 3 KMEM_CACHE_CPU:
ffff88003fd97360
CPU 3 SLAB:
SLAB MEMORY NODE TOTAL ALLOCATED FREE
ffffea0000ed8f80 ffff88003b63e000 0 16 13 3
FREE / [ALLOCATED]
[ffff88003b63e000]
...
<cut>
Signed-off-by: Qiao Nuohan <qiaonuohan(a)cn.fujitsu.com>
---
memory.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/memory.c b/memory.c
index 6b7289b..10fa273 100755
--- a/memory.c
+++ b/memory.c
@@ -17466,6 +17466,11 @@ do_kmem_cache_slub(struct meminfo *si)
per_cpu = (ulong *)GETBUF(sizeof(ulong) * vt->numnodes);
for (i = 0; i < kt->cpus; i++) {
+ if (hide_offline_cpu(i)) {
+ fprintf(fp, "CPU %d <OFFLINE>\n", i);
+ continue;
+ }
+
cpu_slab_ptr = ULONG(si->cache_buf + OFFSET(kmem_cache_cpu_slab)) +
kt->__per_cpu_offset[i];
fprintf(fp, "CPU %d KMEM_CACHE_CPU:\n %lx\n", i, cpu_slab_ptr);
--
1.8.5.3
9:09 p.m.
New subject: [PATCH v2 20/25] modify struct/union/* [:cpuspec] to hide offline cpus' data
with [:cpuspec] struct/union/* will display per-cpu structure/union of the
specified cpus. This patch will hide data of offline cpus.
The original output is like below:
<cut>
crash> call_function_data 15080:a
[0]: ffff88003fc15080
struct call_function_data {
csd = 0x177e8,
...
cpumask = 0xffff88003daf4000,
cpumask_ipi = 0xffff88003daf4400
}
[2]: ffff88003fd15080
struct call_function_data {
csd = 0x18248,
cpumask = 0xffff88003daf4800,
cpumask_ipi = 0xffff88003daf4c00
}
[3]: ffff88003fd95080
...
<cut>
With data of offline cpu(cpu #2) hiden, the output is like below:
<cut>
crash> call_function_data 15080:a
[0]: ffff88003fc15080
struct call_function_data {
csd = 0x177e8,
...
cpumask = 0xffff88003daf4000,
cpumask_ipi = 0xffff88003daf4400
}
[2]: <OFFLINE>
[3]: ffff88003fd95080
...
<cut>
Signed-off-by: Qiao Nuohan <qiaonuohan(a)cn.fujitsu.com>
---
symbols.c | 10 +++++++++-
1 file changed, 9 insertions(+), 1 deletion(-)
diff --git a/symbols.c b/symbols.c
index a0f256e..11bae02 100755
--- a/symbols.c
+++ b/symbols.c
@@ -6147,7 +6147,15 @@ cmd_datatype_common(ulong flags)
continue;
cpuaddr = addr + kt->__per_cpu_offset[c];
- fprintf(fp, "[%d]: %lx\n", c, cpuaddr);
+
+ fprintf(fp, "[%d]: ", c);
+
+ if (hide_offline_cpu(c)) {
+ fprintf(fp, "<OFFLINE>\n");
+ continue;
+ }
+
+ fprintf(fp, "%lx\n", cpuaddr);
do_datatype_addr(dm, cpuaddr , count,
flags, memberlist, argc_members);
}
--
1.8.5.3
9:09 p.m.
New subject: [PATCH v2 21/25] modify command p to hide offline cpus' data
command p can be used to display data of per-cpu symbol. This patch is
used to hide data of offline cpus.
The original output is like below:
<cut>
crash> p cpu_number:a
per_cpu(cpu_number, 0) = $1 = 0
per_cpu(cpu_number, 1) = $2 = 1
per_cpu(cpu_number, 2) = $3 = 2
per_cpu(cpu_number, 3) = $4 = 3
<cut>
With data of offline cpu(cpu #2) hiden, the output is like below:
<cut>
crash> p cpu_number:a
per_cpu(cpu_number, 0) = $1 = 0
per_cpu(cpu_number, 1) = $2 = 1
cpu 2 is OFFLINE.
per_cpu(cpu_number, 3) = $3 = 3
<cut>
Signed-off-by: Qiao Nuohan <qiaonuohan(a)cn.fujitsu.com>
---
symbols.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/symbols.c b/symbols.c
index 11bae02..36031c6 100755
--- a/symbols.c
+++ b/symbols.c
@@ -6847,6 +6847,11 @@ display_per_cpu_info(struct syment *sp, int radix, char *cpuspec)
module_symbol(sp->value, NULL, NULL, NULL, *gdb_output_radix);
for (c = 0; c < kt->cpus; c++) {
+ if (hide_offline_cpu(c)) {
+ fprintf(fp, "cpu %d is OFFLINE.\n", c);
+ continue;
+ }
+
if (cpus && !NUM_IN_BITMAP(cpus, c))
continue;
addr = sp->value + kt->__per_cpu_offset[c];
--
1.8.5.3
9:09 p.m.
New subject: [PATCH v2 22/25] modify ps to indicate idle task on offline cpu
this patch will fix ps command not to display ">" before idle task on
offline cpu and add an "<OFFLINE>" at the end of the line.
The original output is like below:
<cut>
PID PPID CPU TASK ST %MEM VSZ RSS COMM
0 0 0 ffffffff818d5440 RU 0.0 0 0
[swapper/0]
0 0 1 ffff88003dad4fa0 RU 0.0 0 0 [swapper/1]
0 0 2 ffff88003dad5b00 RU 0.0 0 0 [swapper/2]
0 0 3 ffff88003dad6660 RU 0.0 0 0 [swapper/3]
1
0 1 ffff88003da98000 IN 0.7 50792 7056 systemd
2 0 3 ffff88003da98b60 IN 0.0 0 0 [kthreadd]
...
<cut>
With this patch, the idle task on offline cpu(cpu #2) will be changed like
below:
<cut>
PID PPID CPU TASK ST %MEM VSZ RSS COMM
0 0 0 ffffffff818d5440 RU 0.0 0 0
[swapper/0]
0 0 1 ffff88003dad4fa0 RU 0.0 0 0 [swapper/1]
0
0 2 ffff88003dad5b00 RU 0.0 0 0 [swapper/2] <OFFLINE>
0 0 3 ffff88003dad6660 RU 0.0 0 0
[swapper/3]
1 0 1 ffff88003da98000 IN 0.7 50792 7056 systemd
2 0 3 ffff88003da98b60 IN 0.0 0 0 [kthreadd]
...
<cut>
Signed-off-by: Qiao Nuohan <qiaonuohan(a)cn.fujitsu.com>
---
task.c | 22 +++++++++++++++++++---
1 file changed, 19 insertions(+), 3 deletions(-)
diff --git a/task.c b/task.c
index 53fc060..27c3aa4 100755
--- a/task.c
+++ b/task.c
@@ -3093,6 +3093,7 @@ show_ps_data(ulong flag, struct task_context *tc, struct psinfo
*psi)
char buf2[BUFSIZE];
char buf3[BUFSIZE];
ulong tgid;
+ int task_active, task_offline;
if ((flag & PS_USER) && is_kernel_thread(tc->task))
return;
@@ -3153,7 +3154,17 @@ show_ps_data(ulong flag, struct task_context *tc, struct psinfo
*psi)
tm = &task_mem_usage;
get_task_mem_usage(tc->task, tm);
- fprintf(fp, "%s", is_task_active(tc->task) ? "> " : "
");
+
+ task_offline = FALSE;
+ task_active = is_task_active(tc->task);
+
+ /* check whether the task is "active" on an offline cpu */
+ if (task_active && check_offline_cpu(tc->processor)) {
+ task_active = FALSE;
+ task_offline = TRUE;
+ }
+
+ fprintf(fp, "%s", task_active ? "> " : " ");
fprintf(fp, "%5ld %5ld %2s %s %3s",
tc->pid, task_to_pid(tc->ptask),
task_cpu(tc->processor, buf2, !VERBOSE),
@@ -3167,9 +3178,14 @@ show_ps_data(ulong flag, struct task_context *tc, struct psinfo
*psi)
fprintf(fp, "%7ld ", (tm->total_vm * PAGESIZE())/1024);
fprintf(fp, "%6ld ", (tm->rss * PAGESIZE())/1024);
if (is_kernel_thread(tc->task))
- fprintf(fp, "[%s]\n", tc->comm);
+ fprintf(fp, "[%s]", tc->comm);
else
- fprintf(fp, "%s\n", tc->comm);
+ fprintf(fp, "%s", tc->comm);
+
+ if (task_offline)
+ fprintf(fp, " <OFFLINE>\n");
+ else
+ fprintf(fp, "\n");
}
static void
--
1.8.5.3
9:09 p.m.
New subject: [PATCH v2 23/25] modify print_task_header() to indicate idle task on offline cpu
Since the offline cpu is halt, the active task(idle task) on offline cpu
is not running actually. Add "<OFFLINE>" at the end of task header to
indicate such tasks.
The offline cpu is #2, and the output is changed from:
<cut>
crash> ps -l
...
[ 0] [RU] PID: 0 TASK: ffffffff818d5440 CPU: 0 COMMAND:
"swapper/0"
[ 0] [RU] PID: 0 TASK: ffff88003dad4fa0 CPU: 1 COMMAND:
"swapper/1"
[ 0] [RU] PID: 0 TASK: ffff88003dad5b00 CPU: 2 COMMAND:
"swapper/2"
[ 0] [RU] PID: 0 TASK: ffff88003dad6660 CPU: 3 COMMAND:
"swapper/3"
<cut>
to:
<cut>
crash> ps -l
...
[ 0] [RU] PID: 0 TASK: ffffffff818d5440 CPU: 0 COMMAND:
"swapper/0"
[ 0] [RU] PID: 0 TASK: ffff88003dad4fa0 CPU: 1 COMMAND:
"swapper/1"
[ 0] [RU] PID: 0 TASK: ffff88003dad5b00 CPU: 2 COMMAND:
"swapper/2" <OFFLINE>
[ 0] [RU] PID: 0 TASK: ffff88003dad6660 CPU: 3 COMMAND:
"swapper/3"
<cut>
Signed-off-by: Qiao Nuohan <qiaonuohan(a)cn.fujitsu.com>
---
task.c | 10 ++++++++--
1 file changed, 8 insertions(+), 2 deletions(-)
diff --git a/task.c b/task.c
index 27c3aa4..2c8c4e4 100755
--- a/task.c
+++ b/task.c
@@ -6609,10 +6609,16 @@ print_task_header(FILE *out, struct task_context *tc, int
newline)
char buf[BUFSIZE];
char buf1[BUFSIZE];
- fprintf(out, "%sPID: %-5ld TASK: %s CPU: %-2s COMMAND:
\"%s\"\n",
+ int task_offline;
+
+ task_offline = is_task_active(tc->task) &&
+ check_offline_cpu(tc->processor);
+
+ fprintf(out, "%sPID: %-5ld TASK: %s CPU: %-2s COMMAND: \"%s\"
%s\n",
newline ? "\n" : "", tc->pid,
mkstring(buf1, VADDR_PRLEN, LJUST|LONG_HEX, MKSTR(tc->task)),
- task_cpu(tc->processor, buf, !VERBOSE), tc->comm);
+ task_cpu(tc->processor, buf, !VERBOSE), tc->comm,
+ task_offline ? "<OFFLINE>" : "");
}
/*
--
1.8.5.3
9:09 p.m.
New subject: [PATCH v2 24/25] modify ps -l/-m -C cpu to hide offline cpus' data
ps -l/-m -C cpu is used to dump most-recently run tasks on specified
cpus. This patch is used to hide data of offline cpus.
The original output is like below:
<cut>
crash> ps -l -C 2
CPU: 2
[ 3443744250246] [??] PID: 25 TASK: ffff88003dafb8e0 CPU: 2 COMMAND:
"migration/2"
[ 3443744209862] [??] PID: 24 TASK: ffff88003dafad80 CPU: 2 COMMAND:
"watchdog/2"
...
[ 501159134] [IN] PID: 52 TASK: ffff88003d4a38e0 CPU: 2 COMMAND:
"crypto"
[ 409792745] [IN] PID: 48 TASK: ffff88003d4a4440 CPU: 2 COMMAND:
"kswapd0"
[ 0] [RU] PID: 0 TASK: ffff88003dad5b00 CPU: 2 COMMAND:
"swapper/2"
<cut>
With data of offline cpu(cpu #2) hiden, the output is like below:
<cut>
crash> ps -l -C 2
CPU: 2 <OFFLINE>
<cut>
Signed-off-by: Qiao Nuohan <qiaonuohan(a)cn.fujitsu.com>
---
task.c | 16 ++++++++++++++--
1 file changed, 14 insertions(+), 2 deletions(-)
diff --git a/task.c b/task.c
index 2c8c4e4..bc11cf3 100755
--- a/task.c
+++ b/task.c
@@ -3348,8 +3348,14 @@ show_last_run(struct task_context *tc, struct psinfo *psi)
for (c = others = 0; c < kt->cpus; c++) {
if (!NUM_IN_BITMAP(psi->cpus, c))
continue;
- fprintf(fp, "%sCPU: %d\n",
+ fprintf(fp, "%sCPU: %d",
others++ ? "\n" : "", c);
+ if (hide_offline_cpu(c)) {
+ fprintf(fp, " <OFFLINE>\n");
+ continue;
+ } else
+ fprintf(fp, "\n");
+
tcp = FIRST_CONTEXT();
for (i = 0; i < RUNNING_TASKS(); i++, tcp++) {
if (tcp->processor != c)
@@ -3431,9 +3437,15 @@ show_milliseconds(struct task_context *tc, struct psinfo *psi)
if (!NUM_IN_BITMAP(psi->cpus, c))
continue;
- fprintf(fp, "%sCPU: %d\n",
+ fprintf(fp, "%sCPU: %d",
others++ ? "\n" : "", c);
+ if (hide_offline_cpu(c)) {
+ fprintf(fp, " <OFFLINE>\n");
+ continue;
+ } else
+ fprintf(fp, "\n");
+
if ((kt->flags & SMP) && (kt->flags & PER_CPU_OFF))
runq = rq_sp->value + kt->__per_cpu_offset[c];
else
--
1.8.5.3
9:09 p.m.
New subject: [PATCH v2 25/25] modify runq to hide offline cpus' data
With the patch, runq [-t/-m/-g/-d] can hide data on offline cpus.
The original output of thest command is like below:
<cut>
crash> runq
CPU 0 RUNQUEUE: ffff88002c216680
CURRENT: PID: 0 TASK: ffffffff81a8d020 COMMAND: "swapper"
RT PRIO_ARRAY: ffff88002c216808
[no tasks queued]
CFS RB_ROOT: ffff88002c216718
[no tasks queued]
...
CPU 3 RUNQUEUE: ffff88002c396680
CURRENT: PID: 0 TASK: ffff880219f9aaa0 COMMAND: "swapper"
RT PRIO_ARRAY: ffff88002c396808
[no tasks queued]
CFS RB_ROOT: ffff88002c396718
[no tasks queued]
crash> runq -t
CPU 0: 107470918732460
000000000000000 PID: 0 TASK: ffffffff81a8d020 COMMAND: "swapper"
CPU 1: 107470922094506
000000000000000 PID: 0 TASK: ffff880219f5b540 COMMAND: "swapper"
CPU 2: 107470921985118
107470921000315 PID: 16905 TASK: ffff88018f6e3500 COMMAND: "crash"
CPU 3: 15082503595357
00000000000000 PID: 0 TASK: ffff880219f9aaa0 COMMAND: "swapper"
crash> runq -m
CPU 0: [1 05:51:25.919] PID: 0 TASK: ffffffff81a8d020 COMMAND:
"swapper"
CPU 1: [0 00:00:00.002] PID: 16905 TASK: ffff88018f6e3500 COMMAND: "crash"
CPU 2: [1 05:51:25.911] PID: 0 TASK: ffff880219f64040 COMMAND:
"swapper"
CPU 3: [0 04:11:22.503] PID: 0 TASK: ffff880219f9aaa0 COMMAND:
"swapper"
crash> runq -g
CPU 0
CURRENT: PID: 0 TASK: ffffffff81a8d020 COMMAND: "swapper"
INIT_TASK_GROUP: ffffffff81e1f780 RT_RQ: ffff88002c216808
[no tasks queued]
INIT_TASK_GROUP: ffffffff81e1f780 CFS_RQ: ffff88002c2166e8
[no tasks queued]
...
CPU 3
CURRENT: PID: 0 TASK: ffff880219f9aaa0 COMMAND: "swapper"
INIT_TASK_GROUP: ffffffff81e1f780 RT_RQ: ffff88002c396808
[no tasks queued]
INIT_TASK_GROUP: ffffffff81e1f780 CFS_RQ: ffff88002c3966e8
[no tasks queued]
crash> runq -d
CPU 0
[no tasks queued]
CPU 1
[120] PID: 2760 TASK: ffff88021305aaa0 COMMAND: "Xorg"
CPU 2
[120] PID: 16905 TASK: ffff88018f6e3500 COMMAND: "crash"
CPU 3
[no tasks queued]
<cut>
With data of offline cpu(cpu #3) hiden, the output is like below:
<cut>
crash> runq
CPU 0 RUNQUEUE: ffff88002c216680
CURRENT: PID: 0 TASK: ffffffff81a8d020 COMMAND: "swapper"
RT PRIO_ARRAY: ffff88002c216808
[no tasks queued]
CFS RB_ROOT: ffff88002c216718
[no tasks queued]
...
CPU 2 RUNQUEUE: ffff88002c316680
CURRENT: PID: 16905 TASK: ffff88018f6e3500 COMMAND: "crash"
RT PRIO_ARRAY: ffff88002c316808
[no tasks queued]
CFS RB_ROOT: ffff88002c316718
[no tasks queued]
CPU 3 <OFFLINE>
crash> runq -t
CPU 0: 107605503006397
107605495037692 PID: 16905 TASK: ffff88018f6e3500 COMMAND: "crash"
CPU 1: 107605503645955
000000000000000 PID: 0 TASK: ffff880219f5b540 COMMAND: "swapper"
CPU 2: 107605500267130
000000000000000 PID: 0 TASK: ffff880219f64040 COMMAND: "swapper"
CPU 3: <OFFLINE>
crash> runq -m
CPU 0: [1 05:53:41.958] PID: 0 TASK: ffffffff81a8d020 COMMAND:
"swapper"
CPU 1: [1 05:53:41.959] PID: 0 TASK: ffff880219f5b540 COMMAND:
"swapper"
CPU 2: [0 00:00:00.000] PID: 16905 TASK: ffff88018f6e3500 COMMAND: "crash"
CPU 3: <OFFLINE>
crash> runq -g
CPU 0
CURRENT: PID: 0 TASK: ffffffff81a8d020 COMMAND: "swapper"
INIT_TASK_GROUP: ffffffff81e1f780 RT_RQ: ffff88002c216808
[no tasks queued]
INIT_TASK_GROUP: ffffffff81e1f780 CFS_RQ: ffff88002c2166e8
[no tasks queued]
...
CPU 2
CURRENT: PID: 0 TASK: ffff880219f64040 COMMAND: "swapper"
INIT_TASK_GROUP: ffffffff81e1f780 RT_RQ: ffff88002c316808
[no tasks queued]
INIT_TASK_GROUP: ffffffff81e1f780 CFS_RQ: ffff88002c3166e8
[no tasks queued]
CPU 3 <OFFLINE>
crash> runq -d
CPU 0
[no tasks queued]
CPU 1
[120] PID: 16905 TASK: ffff88018f6e3500 COMMAND: "crash"
CPU 2
[no tasks queued]
CPU 3 <OFFLINE>
<cut>
Signed-off-by: Qiao Nuohan <qiaonuohan(a)cn.fujitsu.com>
---
task.c | 49 +++++++++++++++++++++++++++++++++++++++++--------
1 file changed, 41 insertions(+), 8 deletions(-)
diff --git a/task.c b/task.c
index bc11cf3..68a52a3 100755
--- a/task.c
+++ b/task.c
@@ -7641,8 +7641,14 @@ dump_on_rq_timestamp(void)
sprintf(buf, pc->output_radix == 10 ? "%llu" :
"%llx",
timestamp);
- fprintf(fp, "%sCPU %d: %s\n", cpu < 10 ? " " : "",
- cpu, buf);
+ fprintf(fp, "%sCPU %d: ", cpu < 10 ? " " : "", cpu);
+
+ if (hide_offline_cpu(cpu)) {
+ fprintf(fp, "<OFFLINE>\n");
+ continue;
+ } else
+ fprintf(fp, "%s\n", buf);
+
len = strlen(buf);
if ((tc = task_to_context(tt->active_set[cpu]))){
@@ -7721,6 +7727,11 @@ dump_on_rq_milliseconds(void)
else
indent = max_indent - 4;
+ if (hide_offline_cpu(cpu)) {
+ fprintf(fp, "%sCPU %d: <OFFLINE>\n", space(indent), cpu);
+ continue;
+ }
+
if ((tc = task_to_context(tt->active_set[cpu])))
task_timestamp = task_last_run(tc->task);
else {
@@ -7848,8 +7859,13 @@ dump_runqueues(void)
runq = rq_sp->value;
}
- fprintf(fp, "%sCPU %d RUNQUEUE: %lx\n", cpu ? "\n" : "",
- cpu, runq);
+ fprintf(fp, "%sCPU %d ", cpu ? "\n" : "", cpu);
+
+ if (hide_offline_cpu(cpu)) {
+ fprintf(fp, "<OFFLINE>\n");
+ continue;
+ } else
+ fprintf(fp, "RUNQUEUE: %lx\n", runq);
fprintf(fp, " CURRENT: ");
if ((tc = task_to_context(tt->active_set[cpu])))
@@ -8303,8 +8319,13 @@ dump_on_rq_tasks(void)
}
for (cpu = 0; cpu < kt->cpus; cpu++) {
+ fprintf(fp, "%sCPU %d", cpu ? "\n" : "",
cpu);
- fprintf(fp, "%sCPU %d\n", cpu ? "\n" : "",
cpu);
+ if (hide_offline_cpu(cpu)) {
+ fprintf(fp, " <OFFLINE>\n");
+ continue;
+ } else
+ fprintf(fp, "\n");
tc = FIRST_CONTEXT();
tot = 0;
@@ -8437,8 +8458,13 @@ dump_CFS_runqueues(void)
else
runq = rq_sp->value;
- fprintf(fp, "%sCPU %d RUNQUEUE: %lx\n", cpu ? "\n" :
"",
- cpu, runq);
+ fprintf(fp, "%sCPU %d ", cpu ? "\n" : "",
cpu);
+
+ if (hide_offline_cpu(cpu)) {
+ fprintf(fp, "<OFFLINE>\n");
+ continue;
+ } else
+ fprintf(fp, "RUNQUEUE: %lx\n", runq);
fprintf(fp, " CURRENT: ");
if ((tc = task_to_context(tt->active_set[cpu])))
@@ -8930,7 +8956,14 @@ dump_tasks_by_task_group(void)
sizeof(ulong), "task_group rt_rq", FAULT_ON_ERROR);
readmem(cfs_rq + cpu * sizeof(ulong), KVADDR, &cfs_rq_p,
sizeof(ulong), "task_group cfs_rq", FAULT_ON_ERROR);
- fprintf(fp, "%sCPU %d\n", cpu ? "\n" : "", cpu);
+ fprintf(fp, "%sCPU %d", cpu ? "\n" : "", cpu);
+
+ if (hide_offline_cpu(cpu)) {
+ fprintf(fp, " <OFFLINE>\n");
+ continue;
+ } else
+ fprintf(fp, "\n");
+
fprintf(fp, " CURRENT: ");
if ((tc = task_to_context(tt->active_set[cpu])))
fprintf(fp, "PID: %-5ld TASK: %lx COMMAND: \"%s\"\n",
--
1.8.5.3
3 p.m.
----- Original Message -----
For those who don't care about the removed cpu, data of offline
cpu is
bothering. This patchset is trying to hide data of offline cpu. Please
check each patch to see what is hiden.
The last version is here:
https://www.redhat.com/archives/crash-utility/2014-September/msg00000.html
Changelog:
v1->v2:
1. patch 1: add environment variable and its argument to hide/show
data of offline cpu.
2. add description of environment variable to crash.8
3. remove the restrict of x86_64
4. add "<OFFLINE>" to indicate those hiden data.
5. patch 22/23: addd "<OFFLINE>" to indicate idle task on offline
cpu
Qiao Nuohan (25):
add a flag to display/hide data of offline cpus
add an API to check whether to hide a cpus' data
x86_64: modify help -m/-M to hide offline cpus' data
x86_64: modify bt -E to hide offline cpus' data
x86_64: modify mach to hide offline cpus' data
x86_64: modify mach -c to hide offline cpus' data
modify help -r to hide offline cpus' registers
modify bt -c to hide offline cpus' data
modify display_sys_stats() to hide cpus' number
modify help -k to hide offline cpus' number
modify set -c to hide offline cpu
modify irq -s to hide offline cpus' data
modify irq -a to hide offline cpus' data
modify timer -r to hide offline cpus' data
modify timer to hide offline cpus' data
modify ptov offset:cpuspec to hide offline cpus' data
fix max_cpudata_limit() when offlined cpu exists
modify kmem -o to hide offline cpus' data
modify kmem -S(SLUB) to hide offline cpus' data
modify struct/union/* [:cpuspec] to hide offline cpus' data
modify command p to hide offline cpus' data
modify ps to indicate idle task on offline cpu
modify print_task_header() to indicate idle task on offline cpu
modify ps -l/-m -C cpu to hide offline cpus' data
modify runq to hide offline cpus' data
crash.8 | 4 +++
defs.h | 3 ++
diskdump.c | 6 +++-
help.c | 6 ++++
kernel.c | 83 +++++++++++++++++++++++++++++++++++++++++++++++++----
main.c | 15 +++++++++-
memory.c | 30 +++++++++++++++----
netdump.c | 25 ++++++++++++++--
symbols.c | 15 +++++++++-
task.c | 97
++++++++++++++++++++++++++++++++++++++++++++++++++++----------
tools.c | 15 ++++++++++
x86_64.c | 74 +++++++++++++++++++++++++++++++++++++++--------
12 files changed, 331 insertions(+), 42 deletions(-)
--
1.8.5.3
Hello Qiao,
In the future, can you please post the patches as attachments?
Unfortunately my Zimbra email web interface replace tabs with spaces,
so I have to manually cut-and-paste each patch from the crash-utility
mailing list archives.
I have a problem with a number of the patches, some of which
I have NAK'd completely, and others I would suggest changing
the output slightly.
As I recall, one of your arguments for doing this is to avoid
verbose display of offline cpu data. But in a few of your
patches, it simply replaces a one-line per-cpu piece of data
with the <OFFLINE> string. To me it makes more sense to
continue to display the data with an "[OFFLINE]" tag appended
to the end of the output line.
Also, I had asked that there be *no* behavioral changes
unless the "offline" environment variable was set to "hide".
But there are a few patches that change things regardless of
the setting. So for the most part, if any of the individual
patches do *not* use your hide_offline_cpu() function, then
it's highly likely that it has been NAK'd.
Lastly, can you make your output show "[OFFLINE]" instead
of "<OFFLINE>"? I'd prefer to keep the usage of "[ brackets
]"
as "informational" in nature, whereas "< braces >" are
typically
used to surround symbol names.
Here are the patches that I have NAK'd or would like changed:
[PATCH v2 03/25] x86_64: modify help -m/-M to hide offline cpus' data
NAK. This patch makes no sense to me. It's a debug command that
shows the contents of the crash-internal machdep and machine_specific
data structures. What possible benefit would there be to hide the
legitimate addresses/contents? Please leave them as they are.
[PATCH v2 05/25] x86_64: modify mach to hide offline cpus' data
Please continue to display the stack addresses, but *followed by*
"[OFFLINE]".
[PATCH v2 09/25] modify display_sys_stats() to hide cpus' number
Here you are changing crash behavior regardless of the "offline"
setting. While it is true that you are now mimicking the PPC64
behaviour, that is because I typically allow IBM to do their own
thing with respect to the PPC64 (and S390/S390X) architectures.
What I would suggest you do is this: for all architectures except
PPC64, continue to show kt->cpus, but append the number of offlined
cpus after it, i.e., something like this:
KERNEL: ../kdump/vmlinux
DUMPFILE: ../kdump/vmcore [PARTIAL DUMP]
CPUS: 4 [1 OFFLINE]
DATE: Tue Sep 23 14:54:26 2014
UPTIME: 00:02:45
[PATCH v2 10/25] modify help -k to hide offline cpus' number
NAK. "help -k" is a debug option whose purpose is to dump the
contents of the crash-internal kernel_table; accordingly, the
"cpus" output should show the contents of the kt->cpus member
regardless whether there are offline cpus.
[PATCH v2 13/25] modify irq -a to hide offline cpus' data
NAK. This command essentially shows the contents of a
cpu mask in a kernel data structure -- regardless whether
the cpu is offline.
[PATCH v2 16/25] modify ptov offset:cpuspec to hide offline cpus' data
There is no reason to *not* show the per-cpu VIRTUAL address, and
you're not saving any space. Instead please show the virtual address
*followed by* "[OFFLINE]".
[PATCH v2 18/25] modify kmem -o to hide offline cpus' data
There is no reason to *not* show the per-cpu OFFSET values, and
you're not saving any space. Instead please show the offset value
*followed by* "[OFFLINE]".
[PATCH v2 22/25] modify ps to indicate idle task on offline cpu
NAK. This patch changes behavior regardless of the "offline" setting.
The swapper task *does* exist, and it actually is the active task on
that (offline) cpu. Plus you're doing it only for the active task
on the offline cpu -- but there would still be several other kernel
tasks shown for that cpu even when it is offline.
[PATCH v2 23/25] modify print_task_header() to indicate idle task on offline cpu
NAK. This patches changes behavior regardless of the "offline" setting.
The print_task_header() function is called by 53 different functions, and
I'm not going to even bother checking each one for relevancy.
Thanks,
Dave
9:59 p.m.
On 09/30/2014 04:00 AM, Dave Anderson wrote:
----- Original Message -----
> For those who don't care about the removed cpu, data of offline cpu is
> bothering. This patchset is trying to hide data of offline cpu. Please
> check each patch to see what is hiden.
>
> The last version is here:
> https://www.redhat.com/archives/crash-utility/2014-September/msg00000.html
>
> Changelog:
> v1->v2:
> 1. patch 1: add environment variable and its argument to hide/show
> data of offline cpu.
> 2. add description of environment variable to crash.8
> 3. remove the restrict of x86_64
> 4. add "<OFFLINE>" to indicate those hiden data.
> 5. patch 22/23: addd "<OFFLINE>" to indicate idle task on offline
> cpu
>
> Qiao Nuohan (25):
> add a flag to display/hide data of offline cpus
> add an API to check whether to hide a cpus' data
> x86_64: modify help -m/-M to hide offline cpus' data
> x86_64: modify bt -E to hide offline cpus' data
> x86_64: modify mach to hide offline cpus' data
> x86_64: modify mach -c to hide offline cpus' data
> modify help -r to hide offline cpus' registers
> modify bt -c to hide offline cpus' data
> modify display_sys_stats() to hide cpus' number
> modify help -k to hide offline cpus' number
> modify set -c to hide offline cpu
> modify irq -s to hide offline cpus' data
> modify irq -a to hide offline cpus' data
> modify timer -r to hide offline cpus' data
> modify timer to hide offline cpus' data
> modify ptov offset:cpuspec to hide offline cpus' data
> fix max_cpudata_limit() when offlined cpu exists
> modify kmem -o to hide offline cpus' data
> modify kmem -S(SLUB) to hide offline cpus' data
> modify struct/union/* [:cpuspec] to hide offline cpus' data
> modify command p to hide offline cpus' data
> modify ps to indicate idle task on offline cpu
> modify print_task_header() to indicate idle task on offline cpu
> modify ps -l/-m -C cpu to hide offline cpus' data
> modify runq to hide offline cpus' data
>
> crash.8 | 4 +++
> defs.h | 3 ++
> diskdump.c | 6 +++-
> help.c | 6 ++++
> kernel.c | 83 +++++++++++++++++++++++++++++++++++++++++++++++++----
> main.c | 15 +++++++++-
> memory.c | 30 +++++++++++++++----
> netdump.c | 25 ++++++++++++++--
> symbols.c | 15 +++++++++-
> task.c | 97
> ++++++++++++++++++++++++++++++++++++++++++++++++++++----------
> tools.c | 15 ++++++++++
> x86_64.c | 74 +++++++++++++++++++++++++++++++++++++++--------
> 12 files changed, 331 insertions(+), 42 deletions(-)
>
> --
> 1.8.5.3
Hello Qiao,
In the future, can you please post the patches as attachments?
Unfortunately my Zimbra email web interface replace tabs with spaces,
so I have to manually cut-and-paste each patch from the crash-utility
mailing list archives.
I see.
I have a problem with a number of the patches, some of which
I have NAK'd completely, and others I would suggest changing
the output slightly.
As I recall, one of your arguments for doing this is to avoid
verbose display of offline cpu data. But in a few of your
patches, it simply replaces a one-line per-cpu piece of data
with the<OFFLINE> string. To me it makes more sense to
continue to display the data with an "[OFFLINE]" tag appended
to the end of the output line.
Also, I had asked that there be *no* behavioral changes
unless the "offline" environment variable was set to "hide".
But there are a few patches that change things regardless of
the setting. So for the most part, if any of the individual
patches do *not* use your hide_offline_cpu() function, then
it's highly likely that it has been NAK'd.
Lastly, can you make your output show "[OFFLINE]" instead
of "<OFFLINE>"? I'd prefer to keep the usage of "[ brackets
]"
as "informational" in nature, whereas "< braces>" are
typically
used to surround symbol names.
I would change it.
Here are the patches that I have NAK'd or would like changed:
[PATCH v2 03/25] x86_64: modify help -m/-M to hide offline cpus' data
NAK. This patch makes no sense to me. It's a debug command that
shows the contents of the crash-internal machdep and machine_specific
data structures. What possible benefit would there be to hide the
legitimate addresses/contents? Please leave them as they are.
[PATCH v2 05/25] x86_64: modify mach to hide offline cpus' data
Please continue to display the stack addresses, but *followed by*
"[OFFLINE]".
[PATCH v2 09/25] modify display_sys_stats() to hide cpus' number
Here you are changing crash behavior regardless of the "offline"
setting. While it is true that you are now mimicking the PPC64
behaviour, that is because I typically allow IBM to do their own
thing with respect to the PPC64 (and S390/S390X) architectures.
What I would suggest you do is this: for all architectures except
PPC64, continue to show kt->cpus, but append the number of offlined
cpus after it, i.e., something like this:
KERNEL: ../kdump/vmlinux
DUMPFILE: ../kdump/vmcore [PARTIAL DUMP]
CPUS: 4 [1 OFFLINE]
DATE: Tue Sep 23 14:54:26 2014
UPTIME: 00:02:45
I see. ppc64 bothers me.
[PATCH v2 10/25] modify help -k to hide offline cpus' number
NAK. "help -k" is a debug option whose purpose is to dump the
contents of the crash-internal kernel_table; accordingly, the
"cpus" output should show the contents of the kt->cpus member
regardless whether there are offline cpus.
[PATCH v2 13/25] modify irq -a to hide offline cpus' data
NAK. This command essentially shows the contents of a
cpu mask in a kernel data structure -- regardless whether
the cpu is offline.
[PATCH v2 16/25] modify ptov offset:cpuspec to hide offline cpus' data
There is no reason to *not* show the per-cpu VIRTUAL address, and
you're not saving any space. Instead please show the virtual address
*followed by* "[OFFLINE]".
[PATCH v2 18/25] modify kmem -o to hide offline cpus' data
There is no reason to *not* show the per-cpu OFFSET values, and
you're not saving any space. Instead please show the offset value
*followed by* "[OFFLINE]".
[PATCH v2 22/25] modify ps to indicate idle task on offline cpu
NAK. This patch changes behavior regardless of the "offline" setting.
The swapper task *does* exist, and it actually is the active task on
that (offline) cpu. Plus you're doing it only for the active task
on the offline cpu -- but there would still be several other kernel
tasks shown for that cpu even when it is offline.
The swapper task of offline cpu showed by ps command is strange to me.
It shows the task is still running, with ">" at the start of the line
and "ST" is "RU", but the cpu is halt. So I think it is needed to
change
the display of these tasks.
I will change the display when "offline" is "hide". And if you
don't
like add "OFFLINE" at the end, What about change "RU" to other(like
"OF")
and delete ">", just like:
<cut>
PID PPID CPU TASK ST %MEM VSZ RSS COMM
...
0 0 2 ffff88003dad5b00 OF 0.0 0 0 [swapper/2]
<OFFLINE>
...
<cut>
[PATCH v2 23/25] modify print_task_header() to indicate idle task on offline cpu
NAK. This patches changes behavior regardless of the "offline" setting.
The print_task_header() function is called by 53 different functions, and
I'm not going to even bother checking each one for relevancy.
Same as 22/25, change "ST" to "OF"?
Thanks,
Dave
--
Crash-utility mailing list
Crash-utility(a)redhat.com
https://www.redhat.com/mailman/listinfo/crash-utility
.
--
Regards
Qiao Nuohan
10:21 a.m.
----- Original Message -----
On 09/30/2014 04:00 AM, Dave Anderson wrote:
>
>
> ----- Original Message -----
>> For those who don't care about the removed cpu, data of offline cpu is
>> bothering. This patchset is trying to hide data of offline cpu. Please
>> check each patch to see what is hiden.
>>
>> The last version is here:
>> https://www.redhat.com/archives/crash-utility/2014-September/msg00000.html
>>
>> Changelog:
>> v1->v2:
>> 1. patch 1: add environment variable and its argument to hide/show
>> data of offline cpu.
>> 2. add description of environment variable to crash.8
>> 3. remove the restrict of x86_64
>> 4. add "<OFFLINE>" to indicate those hiden data.
>> 5. patch 22/23: addd "<OFFLINE>" to indicate idle task on
offline
>> cpu
>>
>> Qiao Nuohan (25):
>> add a flag to display/hide data of offline cpus
>> add an API to check whether to hide a cpus' data
>> x86_64: modify help -m/-M to hide offline cpus' data
>> x86_64: modify bt -E to hide offline cpus' data
>> x86_64: modify mach to hide offline cpus' data
>> x86_64: modify mach -c to hide offline cpus' data
>> modify help -r to hide offline cpus' registers
>> modify bt -c to hide offline cpus' data
>> modify display_sys_stats() to hide cpus' number
>> modify help -k to hide offline cpus' number
>> modify set -c to hide offline cpu
>> modify irq -s to hide offline cpus' data
>> modify irq -a to hide offline cpus' data
>> modify timer -r to hide offline cpus' data
>> modify timer to hide offline cpus' data
>> modify ptov offset:cpuspec to hide offline cpus' data
>> fix max_cpudata_limit() when offlined cpu exists
>> modify kmem -o to hide offline cpus' data
>> modify kmem -S(SLUB) to hide offline cpus' data
>> modify struct/union/* [:cpuspec] to hide offline cpus' data
>> modify command p to hide offline cpus' data
>> modify ps to indicate idle task on offline cpu
>> modify print_task_header() to indicate idle task on offline cpu
>> modify ps -l/-m -C cpu to hide offline cpus' data
>> modify runq to hide offline cpus' data
>>
>> crash.8 | 4 +++
>> defs.h | 3 ++
>> diskdump.c | 6 +++-
>> help.c | 6 ++++
>> kernel.c | 83 +++++++++++++++++++++++++++++++++++++++++++++++++----
>> main.c | 15 +++++++++-
>> memory.c | 30 +++++++++++++++----
>> netdump.c | 25 ++++++++++++++--
>> symbols.c | 15 +++++++++-
>> task.c | 97
>> ++++++++++++++++++++++++++++++++++++++++++++++++++++----------
>> tools.c | 15 ++++++++++
>> x86_64.c | 74 +++++++++++++++++++++++++++++++++++++++--------
>> 12 files changed, 331 insertions(+), 42 deletions(-)
>>
>> --
>> 1.8.5.3
>
>
> Hello Qiao,
>
> In the future, can you please post the patches as attachments?
> Unfortunately my Zimbra email web interface replace tabs with spaces,
> so I have to manually cut-and-paste each patch from the crash-utility
> mailing list archives.
I see.
>
> I have a problem with a number of the patches, some of which
> I have NAK'd completely, and others I would suggest changing
> the output slightly.
>
> As I recall, one of your arguments for doing this is to avoid
> verbose display of offline cpu data. But in a few of your
> patches, it simply replaces a one-line per-cpu piece of data
> with the<OFFLINE> string. To me it makes more sense to
> continue to display the data with an "[OFFLINE]" tag appended
> to the end of the output line.
>
> Also, I had asked that there be *no* behavioral changes
> unless the "offline" environment variable was set to "hide".
> But there are a few patches that change things regardless of
> the setting. So for the most part, if any of the individual
> patches do *not* use your hide_offline_cpu() function, then
> it's highly likely that it has been NAK'd.
>
> Lastly, can you make your output show "[OFFLINE]" instead
> of "<OFFLINE>"? I'd prefer to keep the usage of "[
brackets ]"
> as "informational" in nature, whereas "< braces>" are
typically
> used to surround symbol names.
I would change it.
>
> Here are the patches that I have NAK'd or would like changed:
>
> [PATCH v2 03/25] x86_64: modify help -m/-M to hide offline cpus' data
>
> NAK. This patch makes no sense to me. It's a debug command that
> shows the contents of the crash-internal machdep and machine_specific
> data structures. What possible benefit would there be to hide the
> legitimate addresses/contents? Please leave them as they are.
>
> [PATCH v2 05/25] x86_64: modify mach to hide offline cpus' data
>
> Please continue to display the stack addresses, but *followed by*
> "[OFFLINE]".
>
> [PATCH v2 09/25] modify display_sys_stats() to hide cpus' number
>
> Here you are changing crash behavior regardless of the "offline"
> setting. While it is true that you are now mimicking the PPC64
> behaviour, that is because I typically allow IBM to do their own
> thing with respect to the PPC64 (and S390/S390X) architectures.
> What I would suggest you do is this: for all architectures except
> PPC64, continue to show kt->cpus, but append the number of offlined
> cpus after it, i.e., something like this:
>
> KERNEL: ../kdump/vmlinux
> DUMPFILE: ../kdump/vmcore [PARTIAL DUMP]
> CPUS: 4 [1 OFFLINE]
> DATE: Tue Sep 23 14:54:26 2014
> UPTIME: 00:02:45
I see. ppc64 bothers me.
>
> [PATCH v2 10/25] modify help -k to hide offline cpus' number
>
> NAK. "help -k" is a debug option whose purpose is to dump the
> contents of the crash-internal kernel_table; accordingly, the
> "cpus" output should show the contents of the kt->cpus member
> regardless whether there are offline cpus.
>
> [PATCH v2 13/25] modify irq -a to hide offline cpus' data
>
> NAK. This command essentially shows the contents of a
> cpu mask in a kernel data structure -- regardless whether
> the cpu is offline.
>
> [PATCH v2 16/25] modify ptov offset:cpuspec to hide offline cpus' data
>
> There is no reason to *not* show the per-cpu VIRTUAL address, and
> you're not saving any space. Instead please show the virtual address
> *followed by* "[OFFLINE]".
>
> [PATCH v2 18/25] modify kmem -o to hide offline cpus' data
>
> There is no reason to *not* show the per-cpu OFFSET values, and
> you're not saving any space. Instead please show the offset value
> *followed by* "[OFFLINE]".
>
> [PATCH v2 22/25] modify ps to indicate idle task on offline cpu
>
> NAK. This patch changes behavior regardless of the "offline" setting.
> The swapper task *does* exist, and it actually is the active task on
> that (offline) cpu. Plus you're doing it only for the active task
> on the offline cpu -- but there would still be several other kernel
> tasks shown for that cpu even when it is offline.
The swapper task of offline cpu showed by ps command is strange to me.
It shows the task is still running, with ">" at the start of the line
and "ST" is "RU", but the cpu is halt. So I think it is needed to
change
the display of these tasks.
I will change the display when "offline" is "hide". And if you
don't
like add "OFFLINE" at the end, What about change "RU" to other(like
"OF")
and delete ">", just like:
<cut>
PID PPID CPU TASK ST %MEM VSZ RSS COMM
...
0 0 2 ffff88003dad5b00 OF 0.0 0 0 [swapper/2]
<OFFLINE>
...
<cut>
Regardless whether the cpu is online or not, the cpu's swapper task exists
and is always runnable, so the output is showing its legitimate state. And
since no other task is queued on the cpu's run queue, then it's essentially
the "active" task on that cpu, waiting for it to come back online. I'm not
sure why this is so bothersome to you?
I don't like the idea of "OF" in the state column, because that field shows
the contents of the task's "task_struct.state" member. The command should
show what's in the kernel data structure, not some "made-up" state.
Interesting that you don't seem to be bothered by the other kernel threads
assigned to an offline'd cpu. For example if I take cpu 2 offline on my machine,
it shows this, where PIDs 17, 18 and 19 have "??" status indicators:
crash> ps
PID PPID CPU TASK ST %MEM VSZ RSS COMM
0 0 0 ffffffff81c13440 RU 0.0 0 0 [swapper/0]
0 0 1 ffff88021282d330 RU 0.0 0 0
[swapper/1]
0 0 2 ffff88021282dac0 RU 0.0 0 0 [swapper/2]
0 0 3 ffff88021282e250 RU 0.0 0 0 [swapper/3]
1
0 3 ffff880212828000 IN 0.0 50252 2836 systemd
2 0 0 ffff880212828790 IN 0.0 0 0 [kthreadd]
3 2 0 ffff880212828f20 IN 0.0 0 0 [ksoftirqd/0]
5 2 0 ffff880212829e40 IN 0.0 0 0 [kworker/0:0H]
7 2 0 ffff88021282ad60 IN 0.0 0 0 [kworker/u:0H]
8 2 0 ffff88021282b4f0 IN 0.0 0 0 [migration/0]
9 2 0 ffff88021282bc80 IN 0.0 0 0 [rcu_bh]
10 2 3 ffff88021282c410 IN 0.0 0 0 [rcu_sched]
11 2 0 ffff88021282cba0 IN 0.0 0 0 [watchdog/0]
12 2 1 ffff8802128e0f20 IN 0.0 0 0 [watchdog/1]
13 2 1 ffff8802128e16b0 IN 0.0 0 0 [migration/1]
14 2 1 ffff8802128e1e40 IN 0.0 0 0 [ksoftirqd/1]
16 2 1 ffff8802128e2d60 IN 0.0 0 0 [kworker/1:0H]
17 2 2 ffff8802128e34f0 ?? 0.0 0 0 [watchdog/2]
18 2 2 ffff8802128e3c80 ?? 0.0 0 0 [migration/2]
19 2 2 ffff8802128e4410 ?? 0.0 0 0 [ksoftirqd/2]
21 2 2 ffff8802128e5330 IN 0.0 0 0 [kworker/2:0H]
22 2 3 ffff8802128e5ac0 IN 0.0 0 0 [watchdog/3]
23 2 3 ffff8802128e6250 IN 0.0 0 0 [migration/3]
24 2 3 ffff8802128e69e0 IN 0.0 0 0 [ksoftirqd/3]
Those 3 threads have states of TASK_PARKED (512), which is currently not
recognized by the crash utility. So I queued this fix for that issue today:
https://github.com/crash-utility/crash/commit/4c0a1b34d47b4d34047a00b021e...
Update the "ps" command's "ST" task state display to recognize
the
TASK_PARKED state in Linux 3.9 and later kernels. Without the patch,
the command's "ST" column entry for parked tasks shows "??".
The
state column will now show "PA", and the foreach command will accept
"PA" as a "state" argument.
(anderson(a)redhat.com)
>
> [PATCH v2 23/25] modify print_task_header() to indicate idle task on
> offline cpu
>
> NAK. This patches changes behavior regardless of the "offline"
setting.
> The print_task_header() function is called by 53 different functions,
> and
> I'm not going to even bother checking each one for relevancy.
Same as 22/25, change "ST" to "OF"?
Why bother? It's in the time-sorted list based upon the last time it was
scheduled as an "RU" process. I would just leave it alone.
Dave
2:46 a.m.
Hello Dave,
On 09/30/2014 11:21 PM, Dave Anderson wrote:
Regardless whether the cpu is online or not, the cpu's swapper
task exists
and is always runnable, so the output is showing its legitimate state. And
since no other task is queued on the cpu's run queue, then it's essentially
the "active" task on that cpu, waiting for it to come back online. I'm
not
sure why this is so bothersome to you?
It bothers me because ps shows swapper task on offline cpu and other active
tasks are in the same style. What I want is to show it is different. I wish
to distinguish the swapper task on offline cpu directly without having to
check which cpu is offline firstly.
I would like omitting ">" of idle task on offline cpu and adding
"[OFFLINE]"
at the end of the line when "offline" set to "hide". And maybe you
would like
adding "[OFFLINE]" at the end of those sleeping tasks of offline cpu as well.
I don't like the idea of "OF" in the state column, because that field
shows
the contents of the task's "task_struct.state" member. The command should
show what's in the kernel data structure, not some "made-up" state.
--
Regards
Qiao Nuohan
7:58 a.m.
----- Original Message -----
Hello Dave,
On 09/30/2014 11:21 PM, Dave Anderson wrote:
> Regardless whether the cpu is online or not, the cpu's swapper task exists
> and is always runnable, so the output is showing its legitimate state. And
> since no other task is queued on the cpu's run queue, then it's essentially
> the "active" task on that cpu, waiting for it to come back online.
I'm not
> sure why this is so bothersome to you?
It bothers me because ps shows swapper task on offline cpu and other active
tasks are in the same style. What I want is to show it is different. I wish
to distinguish the swapper task on offline cpu directly without having to
check which cpu is offline firstly.
I would like omitting ">" of idle task on offline cpu and adding
"[OFFLINE]"
at the end of the line when "offline" set to "hide". And maybe you
would like
adding "[OFFLINE]" at the end of those sleeping tasks of offline cpu as well.
I really don't want to append [OFFLINE] to the line, because the task itself
is not offline, but rather the cpu it is assigned to. How about just changing
the ">" with "-"?
Dave
3628
days inactive
3631
days old
devel@lists.crash-utility.osci.io
30 comments
3 participants
participants (3)
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Dave Anderson -
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qiaonuohan