Patch for Optimize extensions's compilation
by 高建云
Hello, When I tried to build crash extensions for arm64, I found that the
default compiler is fixed with gcc. I try to optimize it ,so I send this
patch. Looking forward to hearing from you.
Best wishes,Thank u
9 months, 3 weeks
[PATCH RFC][makedumpfile 00/10] btf/kallsyms based eppic extension for mm page filtering
by Tao Liu
A) This patchset will introduce the following features to makedumpfile:
1) Enable eppic script for memory pages filtering.
2) Enable btf and kallsyms for symbol type and address resolving.
3) Port maple tree data structures and functions, primarily used for
vma iteration.
B) The purpose of the features are:
1) Currently makedumpfile filters mm pages based on page flags, because flags
can help to determine one page's usage. But this page-flag-checking method
lacks of flexibility in certain cases, e.g. if we want to filter those mm
pages occupied by GPU during vmcore dumping due to:
a) GPU may be taking a large memory and contains sensitive data;
b) GPU mm pages have no relations to kernel crash and useless for vmcore
analysis.
But there is no GPU mm page specific flags, and apparently we don't need
to create one just for kdump use. A programmable filtering tool is more
suitable for such cases. In addition, different GPU vendors may use
different ways for mm pages allocating, programmable filtering is better
than hard coding these GPU specific logics into makedumpfile in this case.
2) Currently makedumpfile already contains a programmable filtering tool, aka
eppic script, which allows user to write customized code for data erasing.
However it has the following drawbacks:
a) cannot do mm page filtering.
b) need to access to debuginfo of both kernel and modules, which is not
applicable in the 2nd kernel.
c) Poor performance, making vmcore dumping time unacceptable (See
the following performance testing).
makedumpfile need to resolve the dwarf data from debuginfo, to get symbols
types and addresses. In recent kernel there are dwarf alternatives such
as btf/kallsyms which can be used for this purpose. And btf/kallsyms info
are already packed within vmcore, so we can use it directly.
3) Maple tree data structures are used in recent kernels, such as vma
iteration. So maple tree poring is needed.
With these, this patchset introduces an upgraded eppic, which is based on
btf/kallsyms symbol resolving, and is programmable for mm page filtering.
The following info shows its usage and performance, please note the tests
are performed in 1st kernel:
$ time ./makedumpfile -d 31 -l /var/crash/127.0.0.1-2025-06-10-18\:03\:12/vmcore
/tmp/dwarf.out -x /lib/debug/lib/modules/6.11.8-300.fc41.x86_64/vmlinux
--eppic eppic_scripts/filter_amdgpu_mm_pages.c
real 14m6.894s
user 4m16.900s
sys 9m44.695s
$ time ./makedumpfile -d 31 -l /var/crash/127.0.0.1-2025-06-10-18\:03\:12/vmcore
/tmp/btf.out --eppic eppic_scripts/filter_amdgpu_mm_pages.c
real 0m10.672s
user 0m9.270s
sys 0m1.130s
-rw------- 1 root root 367475074 Jun 10 18:06 btf.out
-rw------- 1 root root 367475074 Jun 10 21:05 dwarf.out
-rw-rw-rw- 1 root root 387181418 Jun 10 18:03 /var/crash/127.0.0.1-2025-06-10-18:03:12/vmcore
C) Discussion:
1) GPU types: Currently only tested with amdgpu's mm page filtering, others
are not tested.
2) Code structure: There are some similar code shared by makedumpfile and
crash, such as maple tree data structure, also I planed to port the
btf/kallsyms code to crash as well, so there are code duplications for
crash & makedumpfile. Since I havn't working on crash poring, code change
on btf/kallsyms is expected. How can we share the code, creating a common
library or keep the duplication as it is?
3) OS: The code can work on rhel-10+/rhel9.5+ on x86_64/arm64/s390/ppc64.
Others are not tested.
D) Testing:
1) If you don't want to create your vmcore, you can find a vmcore which I
created with amdgpu mm pages unfiltered [1], the amdgpu mm pages are
allocated by program [2]. You can use the vmcore in 1st kernel to filter
the amdgpu mm pages by the previous performance testing cmdline. To
verify the pages are filtered in crash:
Unfiltered:
crash> search -c "!QAZXSW@#EDC"
ffff96b7fa800000: !QAZXSW@#EDCXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
ffff96b87c800000: !QAZXSW@#EDCXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
crash> rd ffff96b7fa800000
ffff96b7fa800000: 405753585a415121 !QAZXSW@
crash> rd ffff96b87c800000
ffff96b87c800000: 405753585a415121 !QAZXSW@
Filtered:
crash> search -c "!QAZXSW@#EDC"
crash> rd ffff96b7fa800000
rd: page excluded: kernel virtual address: ffff96b7fa800000 type: "64-bit KVADDR"
crash> rd ffff96b87c800000
rd: page excluded: kernel virtual address: ffff96b87c800000 type: "64-bit KVADDR"
2) You can use eppic_scripts/print_all_vma.c against an ordinary vmcore to
test only btf/kallsyms functions by output all VMAs if no amdgpu
vmcores/machine avaliable.
[1]: https://people.redhat.com/~ltao/core/
[2]: https://gist.github.com/liutgnu/a8cbce1c666452f1530e1410d1f352df
Tao Liu (10):
dwarf_info: Support kernel address randomization
dwarf_info: Fix a infinite recursion bug for search_domain
Add page filtering function
Add btf/kallsyms support for symbol type/address resolving
Export necessary btf/kallsyms functions to eppic extension
Port the maple tree data structures and functions
Supporting main() as the entry of eppic script
Enable page filtering for dwarf eppic
Enable page filtering for btf/kallsyms eppic
Introducing 2 eppic scripts to test the dwarf/btf eppic extension
Makefile | 6 +-
btf.c | 919 +++++++++++++++++++++++++
btf.h | 176 +++++
dwarf_info.c | 15 +-
eppic_maple.c | 431 ++++++++++++
eppic_maple.h | 8 +
eppic_scripts/filter_amdgpu_mm_pages.c | 36 +
eppic_scripts/print_all_vma.c | 29 +
erase_info.c | 123 +++-
erase_info.h | 22 +
extension_btf.c | 218 ++++++
extension_eppic.c | 41 +-
extension_eppic.h | 6 +-
kallsyms.c | 371 ++++++++++
kallsyms.h | 42 ++
makedumpfile.c | 21 +-
makedumpfile.h | 11 +
17 files changed, 2448 insertions(+), 27 deletions(-)
create mode 100644 btf.c
create mode 100644 btf.h
create mode 100644 eppic_maple.c
create mode 100644 eppic_maple.h
create mode 100644 eppic_scripts/filter_amdgpu_mm_pages.c
create mode 100644 eppic_scripts/print_all_vma.c
create mode 100644 extension_btf.c
create mode 100644 kallsyms.c
create mode 100644 kallsyms.h
--
2.47.0
9 months, 3 weeks
[PATCH] vtop: Translate IEP flag for s390 region and and segment entries.
by Mikhail Zaslonko
Translate and print the IEP (Instruction Execution Protection) flag for
Region-Third-Table entries and Segment-Table entries of Format
Control 1 for the S390X 'vtop' command like shown below.
STE: 0000000033be8ac0 => 0000000015803503 (flags = 03503)
flags in binary : AV=0; ACC=0011; F=0; FC=1; P=0; IEP=1; I=0; CS=0; TT=0
Signed-off-by: Mikhail Zaslonko <zaslonko(a)linux.ibm.com>
---
s390x.c | 8 ++++++--
1 file changed, 6 insertions(+), 2 deletions(-)
diff --git a/s390x.c b/s390x.c
index 0e8e2b3..4a462e3 100644
--- a/s390x.c
+++ b/s390x.c
@@ -65,6 +65,7 @@
#define S390X_RTE_TF 0xc0ULL
#define S390X_RTE_TF_10 0x80ULL
#define S390X_RTE_TF_01 0x40ULL
+#define S390X_RTE_IEP 0x100ULL
#define S390X_RTE_P 0x200ULL
#define S390X_RTE_FC 0x400ULL
#define S390X_RTE_F 0x800ULL
@@ -82,6 +83,7 @@
#define S390X_STE_TT_01 0x4ULL
#define S390X_STE_CS 0x10ULL
#define S390X_STE_I 0x20ULL
+#define S390X_STE_IEP 0x100ULL
#define S390X_STE_P 0x200ULL
#define S390X_STE_FC 0x400ULL
#define S390X_STE_F 0x800ULL
@@ -979,7 +981,7 @@ static inline int s390x_pte_present(unsigned long x){
/* Print flags of Segment-Table entry with format control = 1 */
static void print_segment_entry_fc1(ulong val)
{
- fprintf(fp, "AV=%u; ACC=%u%u%u%u; F=%u; FC=%u; P=%u; I=%u; CS=%u; TT=%u%u\n",
+ fprintf(fp, "AV=%u; ACC=%u%u%u%u; F=%u; FC=%u; P=%u; IEP=%u; I=%u; CS=%u; TT=%u%u\n",
!!(val & S390X_STE_AV),
!!(val & S390X_STE_ACC_1000),
!!(val & S390X_STE_ACC_0100),
@@ -988,6 +990,7 @@ static void print_segment_entry_fc1(ulong val)
!!(val & S390X_STE_F),
!!(val & S390X_STE_FC),
!!(val & S390X_STE_P),
+ !!(val & S390X_STE_IEP),
!!(val & S390X_STE_I),
!!(val & S390X_STE_CS),
!!(val & S390X_STE_TT_10),
@@ -1009,7 +1012,7 @@ static void print_segment_entry_fc0(ulong val)
/* Print flags of Region-Third-Table entry with format control = 1 */
static void print_region_third_entry_fc1(ulong val)
{
- fprintf(fp, "AV=%u; ACC=%u%u%u%u; F=%u; FC=%u; P=%u; I=%u; CR=%u; TT=%u%u\n",
+ fprintf(fp, "AV=%u; ACC=%u%u%u%u; F=%u; FC=%u; P=%u; IEP=%u; I=%u; CR=%u; TT=%u%u\n",
!!(val & S390X_RTE_AV),
!!(val & S390X_RTE_ACC_1000),
!!(val & S390X_RTE_ACC_0100),
@@ -1018,6 +1021,7 @@ static void print_region_third_entry_fc1(ulong val)
!!(val & S390X_RTE_F),
!!(val & S390X_RTE_FC),
!!(val & S390X_RTE_P),
+ !!(val & S390X_RTE_IEP),
!!(val & S390X_RTE_I),
!!(val & S390X_RTE_CR),
!!(val & S390X_RTE_TT_10),
--
2.49.0
9 months, 3 weeks
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10 months
[PATCH] help: Add 'help -l' to show memory layout
by Rongwei Wang
From: Rongwei Wang <rongwei.wrw(a)gmail.com>
'help -m' can show most of variables which
relates to memory layout, e.g. userspace_top,
page_offset, vmalloc_start_addr, etc. They
aren't a visual way to show a memory layout
for kernel space.
This patch provides 'help -l' to show memory
layout, usage likes:
crash> help -l
Gap Hole: 0xffffffffff7ff001 - 0xffffffffffffffff Size: 8.0 MB
Fixmap Area: 0xffffffffff578000 - 0xffffffffff7ff000 Size: 2.5 MB
Gap Hole: 0xffffffffff000001 - 0xffffffffff577fff Size: 5.5 MB
Module Area: 0xffffffffa0000000 - 0xffffffffff000000 Size: 1.5 GB
Gap Hole: 0xffffffff84826001 - 0xffffffff9fffffff Size: 439.9 MB
Kernel Image: 0xffffffff81000000 - 0xffffffff84826000 Size: 56.1 MB
Gap Hole: 0xffffeb0000000000 - 0xffffffff80ffffff Size: 21.0 TB
Vmemmap Area: 0xffffea0000000000 - 0xffffeaffffffffff Size: 1.0 TB
Gap Hole: 0xffffe90000000000 - 0xffffe9ffffffffff Size: 1.0 TB
Vmalloc Area: 0xffffc90000000000 - 0xffffe8ffffffffff Size: 32.0 TB
Gap Hole: 0xffffc88000000000 - 0xffffc8ffffffffff Size: 512.0 GB
Linear Mapping: 0xffff888000000000 - 0xffffc87fffffffff Size: 64.0 TB
Linear Gap: 0xffff800000000000 - 0xffff887fffffffff Size: 8.5 TB
Gap Hole: 0x0000800000000000 - 0xffff7fffffffffff Size: 16776960.0 TB
User Space: 0x0000000000000000 - 0x00007fffffffffff Size: 128.0 TB
Signed-off-by: Rongwei Wang <rongwei.wrw(a)gmail.com>
---
defs.h | 14 +++-
help.c | 7 +-
memory.c | 11 +++
x86_64.c | 236 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
4 files changed, 266 insertions(+), 2 deletions(-)
diff --git a/defs.h b/defs.h
index 4fecb83..a3f00d5 100644
--- a/defs.h
+++ b/defs.h
@@ -4100,12 +4100,23 @@ typedef signed int s32;
#define __PHYSICAL_MASK_SHIFT_5LEVEL 52
#define __PHYSICAL_MASK_SHIFT (machdep->machspec->physical_mask_shift)
#define __PHYSICAL_MASK ((1UL << __PHYSICAL_MASK_SHIFT) - 1)
-#define __VIRTUAL_MASK_SHIFT 48
+#define __VIRTUAL_MASK_SHIFT 47
#define __VIRTUAL_MASK ((1UL << __VIRTUAL_MASK_SHIFT) - 1)
#define PAGE_SHIFT 12
#define PAGE_SIZE (1UL << PAGE_SHIFT)
#define PHYSICAL_PAGE_MASK (~(PAGE_SIZE-1) & __PHYSICAL_MASK )
+
+#define KASAN_SHADOW_OFFSET 0xdffffc0000000000
+#define KASAN_SHADOW_SCALE_SHIFT 3
+
+#define KASAN_SHADOW_START (KASAN_SHADOW_OFFSET + \
+ ((-1UL << __VIRTUAL_MASK_SHIFT) >> \
+ KASAN_SHADOW_SCALE_SHIFT))
+#define KASAN_SHADOW_END (KASAN_SHADOW_START + \
+ (1ULL << (__VIRTUAL_MASK_SHIFT - \
+ KASAN_SHADOW_SCALE_SHIFT)))
+
#define _PAGE_BIT_NX 63
#define _PAGE_PRESENT 0x001
#define _PAGE_RW 0x002
@@ -5911,6 +5922,7 @@ int phys_to_page(physaddr_t, ulong *);
int generic_get_kvaddr_ranges(struct vaddr_range *);
int l1_cache_size(void);
int dumpfile_memory(int);
+void dump_memory_layout(void);
#define DUMPFILE_MEM_USED (1)
#define DUMPFILE_FREE_MEM (2)
#define DUMPFILE_MEM_DUMP (3)
diff --git a/help.c b/help.c
index 5d61e0d..cd54744 100644
--- a/help.c
+++ b/help.c
@@ -538,7 +538,7 @@ cmd_help(void)
oflag = 0;
while ((c = getopt(argcnt, args,
- "efNDdmM:ngcaBbHhkKsvVoptTzLOr")) != EOF) {
+ "efNDdmM:ngcaBbHhkKsvVoptTzLOrl")) != EOF) {
switch(c)
{
case 'e':
@@ -666,6 +666,7 @@ cmd_help(void)
fprintf(fp, " -v - vm_table\n");
fprintf(fp, " -V - vm_table (verbose)\n");
fprintf(fp, " -z - help options\n");
+ fprintf(fp, " -l - show memory layout\n");
return;
case 'L':
@@ -676,6 +677,10 @@ cmd_help(void)
dump_registers();
return;
+ case 'l':
+ dump_memory_layout();
+ return;
+
default:
argerrs++;
break;
diff --git a/memory.c b/memory.c
index 400d31a..55ed2f1 100644
--- a/memory.c
+++ b/memory.c
@@ -17657,6 +17657,17 @@ dumpfile_memory(int cmd)
return retval;
}
+#ifdef X86_64
+extern void x86_64_dump_memory_layout(void);
+#endif
+
+void dump_memory_layout(void)
+{
+#ifdef X86_64
+ x86_64_dump_memory_layout();
+#endif
+}
+
/*
* Functions for sparse mem support
*/
diff --git a/x86_64.c b/x86_64.c
index d7da536..bfb53b4 100644
--- a/x86_64.c
+++ b/x86_64.c
@@ -1151,6 +1151,242 @@ x86_64_dump_machdep_table(ulong arg)
fprintf(fp, "excpetion_functions_orig\n");
}
+#define MAX_LAYOUT 32
+struct mem_segment {
+ char name[64];
+ char desc[64];
+ unsigned long start;
+ unsigned long end;
+};
+
+struct mem_layout {
+ int count;
+ struct mem_segment segs[MAX_LAYOUT];
+};
+
+char* format_bytes(unsigned long bytes, char* buffer, int buffer_size)
+{
+ const char* units[] = {"B", "KB", "MB", "GB", "TB"};
+ int i = 0;
+ double readable_size = (double)bytes;
+
+ /* Handle the edge case of zero bytes */
+ if (bytes == 0) {
+ snprintf(buffer, buffer_size, "0 B");
+ return buffer;
+ }
+
+ /* Handle negative values if necessary, though size is typically non-negative */
+ if (bytes < 0) {
+ snprintf(buffer, buffer_size, "Invalid size");
+ return buffer;
+ }
+
+ while (readable_size >= 1024 && i < (sizeof(units) / sizeof(units[0]) - 1)) {
+ readable_size /= 1024;
+ i++;
+ }
+
+ memset(buffer, '\0', buffer_size);
+ snprintf(buffer, buffer_size, "%.1f %s", readable_size, units[i]);
+
+ return buffer;
+}
+
+int compare_segments(const void *a, const void *b)
+{
+ const struct mem_segment *seg_a = (const struct mem_segment *)a;
+ const struct mem_segment *seg_b = (const struct mem_segment *)b;
+
+ if (seg_a->start > seg_b->start) return -1;
+ if (seg_a->start < seg_b->start) return 1;
+ return 0;
+}
+
+void print_layout(struct mem_layout *layout)
+{
+ struct mem_segment *segs = layout->segs;
+ struct mem_segment seg;
+ int i;
+
+ if (layout == NULL)
+ return;
+
+ for (i=0; i<layout->count; i++) {
+ seg = segs[i];
+
+ fprintf(fp, "%s:\t 0x%016lx - 0x%016lx\t Size: %s\n", seg.name, seg.start,
+ seg.end, seg.desc);
+ }
+}
+
+#define __round_mask(x, y) ((__typeof__(x))((y)-1))
+#define round_up(x, y) ((((x)-1) | __round_mask(x, y))+1)
+#define round_down(x, y) ((x) & ~__round_mask(x, y))
+
+/*
+ * memory layout:
+ *
+ * Gap Area: 0xffffffffff7ff001 - 0xffffffffffffffff Size: 8.0 MB
+ * Fixmap Area: 0xffffffffff578000 - 0xffffffffff7ff000 Size: 2.5 MB
+ * Gap Area: 0xffffffffff000001 - 0xffffffffff577fff Size: 5.5 MB
+ * Module Area: 0xffffffffa0000000 - 0xffffffffff000000 Size: 1.5 GB
+ * Gap Area: 0xffffffff84826001 - 0xffffffff9fffffff Size: 439.9 MB
+ * Kernel Image: 0xffffffff81000000 - 0xffffffff84826000 Size: 56.1 MB
+ * Gap Area: 0xffffeb0000000000 - 0xffffffff80ffffff Size: 21.0 TB
+ * Vmemmap Area: 0xffffea0000000000 - 0xffffeaffffffffff Size: 1.0 TB
+ * Gap Area: 0xffffe90000000000 - 0xffffe9ffffffffff Size: 1.0 TB
+ * Vmalloc Area: 0xffffc90000000000 - 0xffffe8ffffffffff Size: 32.0 TB
+ * Gap Area: 0xffffc88000000000 - 0xffffc8ffffffffff Size: 512.0 GB
+ * Linear Mapping: 0xffff888000000000 - 0xffffc87fffffffff Size: 64.0 TB
+ * Linear Gap: 0xffff800000000000 - 0xffff887fffffffff Size: 8.5 TB
+ * Gap Area: 0x0000800000000000 - 0xffff7fffffffffff Size:16776960.0 TB
+ * User Space: 0x0000000000000000 - 0x00007fffffffffff Size: 128.0 TB
+ *
+ * kernel space:
+ * _end, _text
+ * vmemmap_end: ms->vmemmap_end
+ * vmemmap_vaddr: ms->vmemmap_vaddr
+ * vmalloc_end: ms->vmalloc_end
+ * vmalloc_start_addr: ms->vmalloc_start_addr
+ * page_offset_base: ms->page_offset
+ *
+ * user space:
+ * userspace_top: ms->userspace_top
+ *
+ */
+void x86_64_dump_memory_layout(void)
+{
+ struct mem_layout *layout = NULL;
+ ulong text_start, text_end;
+ struct machine_specific *ms = machdep->machspec;
+ int i, next_idx;
+ char size_buf[20];
+ long value = 0;
+
+ layout = malloc(sizeof(struct mem_layout));
+ if (layout == NULL || layout->count == 0) {
+ printf("Layout is empty, nothing to print.\n");
+ return;
+ }
+
+ /* Create a temporary copy to sort for printing, preserving the original order. */
+ struct mem_segment *segments = layout->segs;
+ if(!segments) {
+ perror("Failed to allocate memory for sorting");
+ return;
+ }
+
+ if (!symbol_exists("_text"))
+ return;
+ else
+ text_start = symbol_value("_text");
+
+ if (!symbol_exists("_end"))
+ return;
+ else
+ text_end = symbol_value("_end");
+
+ snprintf(segments[0].name, 64, "Kernel Image");
+ snprintf(segments[0].desc, 64, "%s",
+ format_bytes(text_end - text_start + 1, size_buf, 20));
+ segments[0].start = text_start;
+ segments[0].end = text_end;
+
+ snprintf(segments[1].name, 64, "Vmemmap Area");
+ snprintf(segments[1].desc, 64, "%s",
+ format_bytes(ms->vmemmap_end - ms->vmemmap_vaddr + 1, size_buf, 20));
+ segments[1].start = (ulong)ms->vmemmap_vaddr;
+ segments[1].end = (ulong)ms->vmemmap_end;
+
+ snprintf(segments[2].name, 64, "Module Area");
+ snprintf(segments[2].desc, 64, "%s",
+ format_bytes(ms->modules_end - ms->modules_vaddr + 1, size_buf, 20));
+ segments[2].start = (ulong)ms->modules_vaddr;
+ segments[2].end = (ulong)ms->modules_end;
+
+ snprintf(segments[3].name, 64, "Vmalloc Area");
+ snprintf(segments[3].desc, 64, "%s",
+ format_bytes(ms->vmalloc_end - ms->vmalloc_start_addr + 1, size_buf, 20));
+ segments[3].start = (ulong)ms->vmalloc_start_addr;
+ segments[3].end = (ulong)ms->vmalloc_end;
+
+ snprintf(segments[4].name, 64, "Linear Mapping");
+ segments[4].start = (ulong)ms->page_offset;
+ segments[4].end = (ulong)ms->page_offset + (1UL << machdep->max_physmem_bits) - 1;
+ snprintf(segments[4].desc, 64, "%s",
+ format_bytes(1UL << machdep->max_physmem_bits, size_buf, 20));
+
+ snprintf(segments[5].name, 64, "User Space");
+ snprintf(segments[5].desc, 64, "%s",
+ format_bytes((ulong)ms->userspace_top, size_buf, 20));
+ segments[5].start = 0UL;
+ segments[5].end = (ulong)ms->userspace_top - 1;
+
+ snprintf(segments[6].name, 64, "Linear Gap");
+ segments[6].start = -1UL - (1UL << __VIRTUAL_MASK_SHIFT) + 1;
+ segments[6].end = (ulong)ms->page_offset - 1;
+ snprintf(segments[6].desc, 64, "%s",
+ format_bytes(segments[6].end - segments[6].start + 1, size_buf, 20));
+
+ layout->count = 7;
+ if (kernel_symbol_exists("kasan_init")) {
+ snprintf(segments[7].name, 64, "KASAN");
+ segments[7].start = KASAN_SHADOW_START;
+ segments[7].end = KASAN_SHADOW_END;
+ snprintf(segments[7].desc, 64, "%s",
+ format_bytes(segments[7].end - segments[7].start + 1, size_buf, 20));
+ layout->count++;
+ }
+
+ if (enumerator_value("__end_of_permanent_fixed_addresses", &value)) {
+ unsigned fixaddr_size = 0;
+ int idx = layout->count;
+
+ fixaddr_size = value << PAGE_SHIFT;
+
+ snprintf(segments[7].name, 64, "Fixmap Area");
+ segments[idx].end = round_up(VSYSCALL_START + PAGE_SIZE, 1 << PMD_SHIFT) - PAGE_SIZE;
+ segments[idx].start = segments[idx].end - fixaddr_size;
+
+ snprintf(segments[idx].desc, 64, "%s",
+ format_bytes(segments[idx].end - segments[idx].start + 1, size_buf, 20));
+ layout->count++;
+ }
+
+ /* Sort segments from highest address to lowest. */
+ qsort(segments, layout->count, sizeof(struct mem_segment), compare_segments);
+
+ next_idx = layout->count;
+ /* Insert gap area */
+ for (i=0; i<layout->count; i++) {
+ unsigned long prev_start;
+ unsigned long end = segments[i].end;
+
+ if (i == 0)
+ prev_start = -1UL;
+ else
+ prev_start = segments[i-1].start;
+
+ if (prev_start == (end + 1))
+ continue;
+
+ snprintf(segments[next_idx].name, 64, "Gap Hole");
+ segments[next_idx].start = end + 1;
+ segments[next_idx].end = (i == 0) ? prev_start : prev_start - 1;
+ snprintf(segments[next_idx].desc, 64, "%s",
+ format_bytes(segments[next_idx].end - segments[next_idx].start + 1, size_buf, 20));
+
+ next_idx++;
+ }
+
+ layout->count = next_idx;
+ qsort(segments, layout->count, sizeof(struct mem_segment), compare_segments);
+
+ print_layout(layout);
+ free(layout);
+}
+
/*
* Gather the cpu_pda array info, updating any smp-related items that
* were possibly bypassed or improperly initialized in kernel_init().
--
2.43.5
10 months
