12:48 a.m.
This patch set is to make changes I found necessary during development
of zram support for crash gcore command.
Here are tiny script and program I made to test the zram feature.
This may help your reviewing.
https://github.com/d-hatayama/some_stuff_for_crash_zram_devel
v2:
- Fix compilation error when without lzo library, which is fixed by
newly added 5-th patch to include zram even without lzo library.
- Add 6-th patch aiming to warn that given crash utility is built
without lzo library when encoutering zram pages.
HATAYAMA Daisuke (7):
diskdump, zram: cleanup try_zram_decompress()
diskdump, zram: initialize zram symbol information when needed
diskname, zram: fix fault error when reading zram disk with no symbol
information
diskname, zram: Notify necessity of loading zram module
zram: include zram code even without lzo library
zram: Add warning message when crash is built without lzo library
memory, zram: introduce and export readswap()
defs.h | 3 +-
diskdump.c | 234 ++++++++++++++++++++++++++++++++++++-------------------------
memory.c | 5 +-
3 files changed, 143 insertions(+), 99 deletions(-)
--
1.8.3.1
12:48 a.m.
New subject: [PATCH v2 1/7] diskdump, zram: cleanup try_zram_decompress()
This clean up makes later commits a bit readable.
Signed-off-by: HATAYAMA Daisuke <d.hatayama(a)fujitsu.com>
---
diskdump.c | 145 ++++++++++++++++++++++++++++++++-----------------------------
1 file changed, 75 insertions(+), 70 deletions(-)
diff --git a/diskdump.c b/diskdump.c
index 4f14596..52a255a 100644
--- a/diskdump.c
+++ b/diskdump.c
@@ -2749,85 +2749,90 @@ try_zram_decompress(ulonglong pte_val, unsigned char *buf, ulong
len, ulonglong
sizeof(void *), "block_device_bd_disk", FAULT_ON_ERROR);
readmem(bd_disk + OFFSET(gendisk_disk_name), KVADDR, name,
strlen("zram"), "gendisk_disk_name", FAULT_ON_ERROR);
- if (!strncmp(name, "zram", strlen("zram"))) {
+
+ if (strncmp(name, "zram", strlen("zram"))) {
if (CRASHDEBUG(2))
- error(WARNING, "this page has swapped to zram\n");
-
- readmem(bd_disk + OFFSET(gendisk_private_data), KVADDR, &zram,
- sizeof(void *), "gendisk_private_data", FAULT_ON_ERROR);
-
- readmem(zram + OFFSET(zram_compressor), KVADDR, name,
- sizeof(name), "zram compressor", FAULT_ON_ERROR);
- if (STREQ(name, "lzo")) {
- if (!(dd->flags & LZO_SUPPORTED)) {
- if (lzo_init() == LZO_E_OK)
- dd->flags |= LZO_SUPPORTED;
- else
- return 0;
- }
- decompressor = (void *)lzo1x_decompress_safe;
- } else {//todo,support more compressor
- error(WARNING, "only the lzo compressor is supported\n");
- return 0;
- }
+ error(WARNING,
+ "this page has been swapped to %s\n",
+ name);
+ return 0;
+ }
- if (THIS_KERNEL_VERSION >= LINUX(2, 6, 0)) {
- swp_offset = (ulonglong)__swp_offset(pte_val);
- } else {
- swp_offset = (ulonglong)SWP_OFFSET(pte_val);
- }
+ if (CRASHDEBUG(2))
+ error(WARNING, "this page has swapped to zram\n");
- zram_buf = (unsigned char *)GETBUF(PAGESIZE());
- /*lookup page from swap cache*/
- obj_addr = lookup_swap_cache(pte_val, zram_buf);
- if (obj_addr != NULL) {
- memcpy(buf, obj_addr + off, len);
- goto out;
- }
+ readmem(bd_disk + OFFSET(gendisk_private_data), KVADDR, &zram,
+ sizeof(void *), "gendisk_private_data", FAULT_ON_ERROR);
- sector = swp_offset << (PAGESHIFT() - 9);
- index = sector >> SECTORS_PER_PAGE_SHIFT;
- readmem(zram, KVADDR, &zram_table_entry,
- sizeof(void *), "zram_table_entry", FAULT_ON_ERROR);
- zram_table_entry += (index * SIZE(zram_table_entry));
- readmem(zram_table_entry, KVADDR, &entry,
- sizeof(void *), "entry of table", FAULT_ON_ERROR);
- readmem(zram_table_entry + OFFSET(zram_table_flag), KVADDR, &flags,
- sizeof(void *), "zram_table_flag", FAULT_ON_ERROR);
- if (!entry || (flags & ZRAM_FLAG_SAME_BIT)) {
- memset(buf, entry, len);
- goto out;
- }
- size = flags & (ZRAM_FLAG_SHIFT -1);
- if (size == 0) {
- len = 0;
- goto out;
+ readmem(zram + OFFSET(zram_compressor), KVADDR, name,
+ sizeof(name), "zram compressor", FAULT_ON_ERROR);
+ if (STREQ(name, "lzo")) {
+ if (!(dd->flags & LZO_SUPPORTED)) {
+ if (lzo_init() == LZO_E_OK)
+ dd->flags |= LZO_SUPPORTED;
+ else
+ return 0;
}
+ decompressor = (void *)lzo1x_decompress_safe;
+ } else {//todo,support more compressor
+ error(WARNING, "only the lzo compressor is supported\n");
+ return 0;
+ }
- readmem(zram + OFFSET(zram_mempoll), KVADDR, &zram,
- sizeof(void *), "zram_mempoll", FAULT_ON_ERROR);
+ if (THIS_KERNEL_VERSION >= LINUX(2, 6, 0)) {
+ swp_offset = (ulonglong)__swp_offset(pte_val);
+ } else {
+ swp_offset = (ulonglong)SWP_OFFSET(pte_val);
+ }
- obj_addr = zram_object_addr(zram, entry, zram_buf);
- if (obj_addr == NULL) {
- len = 0;
- goto out;
- }
+ zram_buf = (unsigned char *)GETBUF(PAGESIZE());
+ /*lookup page from swap cache*/
+ obj_addr = lookup_swap_cache(pte_val, zram_buf);
+ if (obj_addr != NULL) {
+ memcpy(buf, obj_addr + off, len);
+ goto out;
+ }
- if (size == PAGESIZE()) {
- memcpy(buf, obj_addr + off, len);
- } else {
- outbuf = (unsigned char *)GETBUF(PAGESIZE());
- outsize = PAGESIZE();
- if (!decompressor(obj_addr, size, outbuf, &outsize, NULL))
- memcpy(buf, outbuf + off, len);
- else {
- error(WARNING, "zram decompress error\n");
- len = 0;
- }
- FREEBUF(outbuf);
- }
+ sector = swp_offset << (PAGESHIFT() - 9);
+ index = sector >> SECTORS_PER_PAGE_SHIFT;
+ readmem(zram, KVADDR, &zram_table_entry,
+ sizeof(void *), "zram_table_entry", FAULT_ON_ERROR);
+ zram_table_entry += (index * SIZE(zram_table_entry));
+ readmem(zram_table_entry, KVADDR, &entry,
+ sizeof(void *), "entry of table", FAULT_ON_ERROR);
+ readmem(zram_table_entry + OFFSET(zram_table_flag), KVADDR, &flags,
+ sizeof(void *), "zram_table_flag", FAULT_ON_ERROR);
+ if (!entry || (flags & ZRAM_FLAG_SAME_BIT)) {
+ memset(buf, entry, len);
+ goto out;
+ }
+ size = flags & (ZRAM_FLAG_SHIFT -1);
+ if (size == 0) {
+ len = 0;
+ goto out;
+ }
+
+ readmem(zram + OFFSET(zram_mempoll), KVADDR, &zram,
+ sizeof(void *), "zram_mempoll", FAULT_ON_ERROR);
+
+ obj_addr = zram_object_addr(zram, entry, zram_buf);
+ if (obj_addr == NULL) {
+ len = 0;
+ goto out;
+ }
+
+ if (size == PAGESIZE()) {
+ memcpy(buf, obj_addr + off, len);
} else {
- return 0;
+ outbuf = (unsigned char *)GETBUF(PAGESIZE());
+ outsize = PAGESIZE();
+ if (!decompressor(obj_addr, size, outbuf, &outsize, NULL))
+ memcpy(buf, outbuf + off, len);
+ else {
+ error(WARNING, "zram decompress error\n");
+ len = 0;
+ }
+ FREEBUF(outbuf);
}
out:
--
1.8.3.1
12:48 a.m.
New subject: [PATCH v2 2/7] diskdump, zram: initialize zram symbol information when needed
In the current code, symbol information related to zram is initialized
even when a given disk is not zram. It should be done after the disk
turns out to be zram.
Signed-off-by: HATAYAMA Daisuke <d.hatayama(a)fujitsu.com>
---
diskdump.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/diskdump.c b/diskdump.c
index 52a255a..9680629 100644
--- a/diskdump.c
+++ b/diskdump.c
@@ -2725,9 +2725,6 @@ try_zram_decompress(ulonglong pte_val, unsigned char *buf, ulong
len, ulonglong
unsigned char *zram_buf = NULL;
unsigned char *outbuf = NULL;
- if (INVALID_MEMBER(zram_compressor))
- zram_init();
-
off = PAGEOFFSET(vaddr);
if (!symbol_exists("swap_info"))
return 0;
@@ -2758,6 +2755,9 @@ try_zram_decompress(ulonglong pte_val, unsigned char *buf, ulong
len, ulonglong
return 0;
}
+ if (INVALID_MEMBER(zram_compressor))
+ zram_init();
+
if (CRASHDEBUG(2))
error(WARNING, "this page has swapped to zram\n");
--
1.8.3.1
12:48 a.m.
New subject: [PATCH v2 3/7] diskname, zram: fix fault error when reading zram disk with no symbol information
When no zram symbol information is initialized, reading memory swapped
out into zram disk results in fault error as follows:
crash> rd -u 0x00007f1cf6c37000
rd: invalid structure member offset: zram_compressor
FILE: diskdump.c LINE: 2753 FUNCTION: try_zram_decompress()
[./crash] error trace: 47a7b1 => 5766eb => 5401b7 => 540146
540146: OFFSET_verify.part.0+70
5401b7: OFFSET_verify+39
5766eb: try_zram_decompress+635
47a7b1: readmem+273
rd: invalid structure member offset: zram_compressor
FILE: diskdump.c LINE: 2753 FUNCTION: try_zram_decompress()
Before zram support, trying to read memory that is swapped out
resulted in inaccessible error as follows:
crash> rd -u 0x00007f1cf6c37000
rd: invalid user virtual address: 7f1cf6c37000 type: "64-bit UVADDR"
This behavior is problematic for crash gcore command to support zram.
The fault error terminates gcore command and then generating core file
fails; this is regression. On the other hand, in the previous one,
gcore command can continue by writing zero pages.
Signed-off-by: HATAYAMA Daisuke <d.hatayama(a)fujitsu.com>
---
diskdump.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/diskdump.c b/diskdump.c
index 9680629..587b45c 100644
--- a/diskdump.c
+++ b/diskdump.c
@@ -2755,8 +2755,11 @@ try_zram_decompress(ulonglong pte_val, unsigned char *buf, ulong
len, ulonglong
return 0;
}
- if (INVALID_MEMBER(zram_compressor))
+ if (INVALID_MEMBER(zram_compressor)) {
zram_init();
+ if (INVALID_MEMBER(zram_compressor))
+ return 0;
+ }
if (CRASHDEBUG(2))
error(WARNING, "this page has swapped to zram\n");
--
1.8.3.1
12:48 a.m.
New subject: [PATCH v2 4/7] diskname, zram: Notify necessity of loading zram module
By the previous commit, trying to read swapped-out-into-zram-disk
pages results in inaccessible memory error that is apparently
irrelevant to zram and users cannot find it necessary to load zram
module. Thus, let's add a warning message to indicate that as follows:
crash> rd -u 0x7f520626e000
WARNING: Some pages are swapped out to zram. Please run mod -s zram.
rd: invalid user virtual address: 7f520626e000 type: "64-bit UVADDR"
Signed-off-by: HATAYAMA Daisuke <d.hatayama(a)fujitsu.com>
---
diskdump.c | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)
diff --git a/diskdump.c b/diskdump.c
index 587b45c..143ac3c 100644
--- a/diskdump.c
+++ b/diskdump.c
@@ -2757,8 +2757,13 @@ try_zram_decompress(ulonglong pte_val, unsigned char *buf, ulong
len, ulonglong
if (INVALID_MEMBER(zram_compressor)) {
zram_init();
- if (INVALID_MEMBER(zram_compressor))
+ if (INVALID_MEMBER(zram_compressor)) {
+ error(WARNING,
+ "Some pages are swapped out to zram. "
+ "Please run mod -s zram.\n",
+ name);
return 0;
+ }
}
if (CRASHDEBUG(2))
--
1.8.3.1
2:05 a.m.
New subject: [PATCH v2 4/7] diskname, zram: Notify necessity of loading zram module
-----Original Message-----
By the previous commit, trying to read swapped-out-into-zram-disk
pages results in inaccessible memory error that is apparently
irrelevant to zram and users cannot find it necessary to load zram
module. Thus, let's add a warning message to indicate that as follows:
crash> rd -u 0x7f520626e000
WARNING: Some pages are swapped out to zram. Please run mod -s zram.
rd: invalid user virtual address: 7f520626e000 type: "64-bit UVADDR"
Signed-off-by: HATAYAMA Daisuke <d.hatayama(a)fujitsu.com>
---
diskdump.c | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)
diff --git a/diskdump.c b/diskdump.c
index 587b45c..143ac3c 100644
--- a/diskdump.c
+++ b/diskdump.c
@@ -2757,8 +2757,13 @@ try_zram_decompress(ulonglong pte_val, unsigned char *buf, ulong
len, ulonglong
if (INVALID_MEMBER(zram_compressor)) {
zram_init();
- if (INVALID_MEMBER(zram_compressor))
+ if (INVALID_MEMBER(zram_compressor)) {
+ error(WARNING,
+ "Some pages are swapped out to zram. "
+ "Please run mod -s zram.\n",
+ name);
This "name" is not needed, but if this patchset does not need another fix,
no need to resend. We will fix it when merging.
Thanks,
Kazu
return 0;
+ }
}
if (CRASHDEBUG(2))
--
1.8.3.1
--
Crash-utility mailing list
Crash-utility(a)redhat.com
https://www.redhat.com/mailman/listinfo/crash-utility
12:48 a.m.
New subject: [PATCH v2 5/7] zram: include zram code even without lzo library
Currently, zram code is included only when LZO is enabled. However,
more natural implementation is that if users encounter pages swapped
into zram that are compressed with unsupported compression algorithm,
crash notifies that. To do so, let's include zram code by default.
Signed-off-by: HATAYAMA Daisuke <d.hatayama(a)fujitsu.com>
---
defs.h | 2 --
diskdump.c | 11 ++++-------
2 files changed, 4 insertions(+), 9 deletions(-)
diff --git a/defs.h b/defs.h
index e468b1d..e1c837a 100644
--- a/defs.h
+++ b/defs.h
@@ -6538,7 +6538,6 @@ void diskdump_device_dump_info(FILE *);
void diskdump_device_dump_extract(int, char *, FILE *);
/*support for zram*/
ulong try_zram_decompress(ulonglong pte_val, unsigned char *buf, ulong len, ulonglong
vaddr);
-#ifdef LZO
#define OBJ_TAG_BITS 1
#ifndef MAX_POSSIBLE_PHYSMEM_BITS
#define MAX_POSSIBLE_PHYSMEM_BITS (MAX_PHYSMEM_BITS())
@@ -6564,7 +6563,6 @@ struct zspage {
unsigned int inuse;
unsigned int freeobj;
};
-#endif
/*
* makedumpfile.c
diff --git a/diskdump.c b/diskdump.c
index 143ac3c..8603d04 100644
--- a/diskdump.c
+++ b/diskdump.c
@@ -2591,7 +2591,6 @@ diskdump_device_dump_info(FILE *ofp)
}
}
-#ifdef LZO
static void
zram_init(void)
{
@@ -2775,6 +2774,7 @@ try_zram_decompress(ulonglong pte_val, unsigned char *buf, ulong
len, ulonglong
readmem(zram + OFFSET(zram_compressor), KVADDR, name,
sizeof(name), "zram compressor", FAULT_ON_ERROR);
if (STREQ(name, "lzo")) {
+#ifdef LZO
if (!(dd->flags & LZO_SUPPORTED)) {
if (lzo_init() == LZO_E_OK)
dd->flags |= LZO_SUPPORTED;
@@ -2782,6 +2782,9 @@ try_zram_decompress(ulonglong pte_val, unsigned char *buf, ulong
len, ulonglong
return 0;
}
decompressor = (void *)lzo1x_decompress_safe;
+#else
+ return 0;
+#endif
} else {//todo,support more compressor
error(WARNING, "only the lzo compressor is supported\n");
return 0;
@@ -2849,9 +2852,3 @@ out:
FREEBUF(zram_buf);
return len;
}
-#else
-ulong try_zram_decompress(ulonglong pte_val, unsigned char *buf, ulong len, ulonglong
vaddr)
-{
- return 0;
-}
-#endif
--
1.8.3.1
12:48 a.m.
New subject: [PATCH v2 6/7] zram: Add warning message when crash is built without lzo library
Now there is no warning message when we encounter zram pages using
crash utility that is built without lzo library. We need to provide
any hint to users what is going on. Let's add a warning message to
indicate the hint as:
crash> rd -u 0x7f520626e000
WARNING: zram decompress error: this executable needs to be built with lzo library
rd: invalid user virtual address: 7f520626e000 type: "64-bit UVADDR"
Signed-off-by: HATAYAMA Daisuke <d.hatayama(a)fujitsu.com>
---
diskdump.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/diskdump.c b/diskdump.c
index 8603d04..76e5e86 100644
--- a/diskdump.c
+++ b/diskdump.c
@@ -2783,6 +2783,9 @@ try_zram_decompress(ulonglong pte_val, unsigned char *buf, ulong
len, ulonglong
}
decompressor = (void *)lzo1x_decompress_safe;
#else
+ error(WARNING,
+ "zram decompress error: this executable needs to be built"
+ " with lzo library\n");
return 0;
#endif
} else {//todo,support more compressor
--
1.8.3.1
12:48 a.m.
New subject: [PATCH v2 7/7] memory, zram: introduce and export readswap()
try_zram_decompress() is currently exported to extension modules, but
from a viewpoint of author of extension modules, it's better to export
an interface to read memory on swap; difference of decompressor are
then hidden within the interface and there is no need for extension
modules to update accordingly each time new decompressor are added in
the future.
So let's introduce function readswap() as an interface to read memory
on swap.
Signed-off-by: HATAYAMA Daisuke <d.hatayama(a)fujitsu.com>
---
defs.h | 1 +
diskdump.c | 67 ++++++++++++++++++++++++++++++++++++++++++++------------------
memory.c | 5 ++++-
3 files changed, 53 insertions(+), 20 deletions(-)
diff --git a/defs.h b/defs.h
index e1c837a..507d48b 100644
--- a/defs.h
+++ b/defs.h
@@ -6536,6 +6536,7 @@ int diskdump_get_nr_cpus(void);
QEMUCPUState *diskdump_get_qemucpustate(int);
void diskdump_device_dump_info(FILE *);
void diskdump_device_dump_extract(int, char *, FILE *);
+ulong readswap(ulonglong pte_val, char *buf, ulong len, ulonglong vaddr);
/*support for zram*/
ulong try_zram_decompress(ulonglong pte_val, unsigned char *buf, ulong len, ulonglong
vaddr);
#define OBJ_TAG_BITS 1
diff --git a/diskdump.c b/diskdump.c
index 76e5e86..a765c3c 100644
--- a/diskdump.c
+++ b/diskdump.c
@@ -2709,24 +2709,15 @@ lookup_swap_cache(ulonglong pte_val, unsigned char *zram_buf)
return NULL;
}
-ulong (*decompressor)(unsigned char *in_addr, ulong in_size, unsigned char *out_addr,
ulong *out_size, void *other/* NOT USED */);
-/*
- * If userspace address was swapped out to zram, this function is called to decompress
the object.
- * try_zram_decompress returns decompressed page data and data length
- */
-ulong
-try_zram_decompress(ulonglong pte_val, unsigned char *buf, ulong len, ulonglong vaddr)
+static int get_disk_name_private_data(ulonglong pte_val,
+ ulonglong vaddr,
+ char *name,
+ ulong *private_data)
{
- char name[32] = {0};
- ulonglong swp_offset;
- ulong swap_info, bdev, bd_disk, zram, zram_table_entry, sector, index, entry, flags,
size, outsize, off;
- unsigned char *obj_addr = NULL;
- unsigned char *zram_buf = NULL;
- unsigned char *outbuf = NULL;
+ ulong swap_info, bdev, bd_disk;
- off = PAGEOFFSET(vaddr);
if (!symbol_exists("swap_info"))
- return 0;
+ return FALSE;
swap_info = symbol_value("swap_info");
@@ -2743,16 +2734,53 @@ try_zram_decompress(ulonglong pte_val, unsigned char *buf, ulong
len, ulonglong
sizeof(void *), "swap_info_struct_bdev", FAULT_ON_ERROR);
readmem(bdev + OFFSET(block_device_bd_disk), KVADDR, &bd_disk,
sizeof(void *), "block_device_bd_disk", FAULT_ON_ERROR);
- readmem(bd_disk + OFFSET(gendisk_disk_name), KVADDR, name,
+ if (name)
+ readmem(bd_disk + OFFSET(gendisk_disk_name), KVADDR, name,
strlen("zram"), "gendisk_disk_name", FAULT_ON_ERROR);
+ if (private_data)
+ readmem(bd_disk + OFFSET(gendisk_private_data), KVADDR,
+ private_data, sizeof(void *), "gendisk_private_data",
+ FAULT_ON_ERROR);
+
+ return TRUE;
+}
+
+ulong readswap(ulonglong pte_val, char *buf, ulong len, ulonglong vaddr)
+{
+ char name[32] = {0};
- if (strncmp(name, "zram", strlen("zram"))) {
+ if (!get_disk_name_private_data(pte_val, vaddr, name, NULL))
+ return 0;
+
+ if (!strncmp(name, "zram", 4)) {
+ return try_zram_decompress(pte_val,
+ (unsigned char *)buf,
+ len,
+ vaddr);
+ } else {
if (CRASHDEBUG(2))
error(WARNING,
"this page has been swapped to %s\n",
name);
return 0;
}
+}
+
+ulong (*decompressor)(unsigned char *in_addr, ulong in_size, unsigned char *out_addr,
ulong *out_size, void *other/* NOT USED */);
+/*
+ * If userspace address was swapped out to zram, this function is called to decompress
the object.
+ * try_zram_decompress returns decompressed page data and data length
+ */
+ulong
+try_zram_decompress(ulonglong pte_val, unsigned char *buf, ulong len, ulonglong vaddr)
+{
+ char name[32] = {0};
+ ulonglong swp_offset;
+ unsigned char *obj_addr = NULL;
+ unsigned char *zram_buf = NULL;
+ unsigned char *outbuf = NULL;
+ ulong zram, zram_table_entry, sector, index, entry, flags, size,
+ outsize, off;
if (INVALID_MEMBER(zram_compressor)) {
zram_init();
@@ -2768,8 +2796,8 @@ try_zram_decompress(ulonglong pte_val, unsigned char *buf, ulong
len, ulonglong
if (CRASHDEBUG(2))
error(WARNING, "this page has swapped to zram\n");
- readmem(bd_disk + OFFSET(gendisk_private_data), KVADDR, &zram,
- sizeof(void *), "gendisk_private_data", FAULT_ON_ERROR);
+ if (!get_disk_name_private_data(pte_val, vaddr, NULL, &zram))
+ return 0;
readmem(zram + OFFSET(zram_compressor), KVADDR, name,
sizeof(name), "zram compressor", FAULT_ON_ERROR);
@@ -2801,6 +2829,7 @@ try_zram_decompress(ulonglong pte_val, unsigned char *buf, ulong
len, ulonglong
zram_buf = (unsigned char *)GETBUF(PAGESIZE());
/*lookup page from swap cache*/
+ off = PAGEOFFSET(vaddr);
obj_addr = lookup_swap_cache(pte_val, zram_buf);
if (obj_addr != NULL) {
memcpy(buf, obj_addr + off, len);
diff --git a/memory.c b/memory.c
index 0848097..7fed5d6 100644
--- a/memory.c
+++ b/memory.c
@@ -2296,7 +2296,10 @@ readmem(ulonglong addr, int memtype, void *buffer, long size,
if (cnt > size)
cnt = size;
- cnt = try_zram_decompress(paddr, (unsigned char *)bufptr, cnt, addr);
+ cnt = readswap(paddr,
+ bufptr,
+ cnt,
+ addr);
if (cnt) {
bufptr += cnt;
addr += cnt;
--
1.8.3.1
10:45 p.m.
Is there any comment?
Thanks.
HATAYAMA, Daisuke
________________________________________
From: HATAYAMA Daisuke <d.hatayama(a)fujitsu.com>
Sent: Friday, December 25, 2020 15:48
To: crash-utility(a)redhat.com
Cc: zhaoqianli(a)xiaomi.com; Hatayama, Daisuke/畑山 大輔
Subject: [PATCH v2 0/7] zram related changes for zram support of crash gcore command
This patch set is to make changes I found necessary during development
of zram support for crash gcore command.
Here are tiny script and program I made to test the zram feature.
This may help your reviewing.
https://github.com/d-hatayama/some_stuff_for_crash_zram_devel
v2:
- Fix compilation error when without lzo library, which is fixed by
newly added 5-th patch to include zram even without lzo library.
- Add 6-th patch aiming to warn that given crash utility is built
without lzo library when encoutering zram pages.
HATAYAMA Daisuke (7):
diskdump, zram: cleanup try_zram_decompress()
diskdump, zram: initialize zram symbol information when needed
diskname, zram: fix fault error when reading zram disk with no symbol
information
diskname, zram: Notify necessity of loading zram module
zram: include zram code even without lzo library
zram: Add warning message when crash is built without lzo library
memory, zram: introduce and export readswap()
defs.h | 3 +-
diskdump.c | 234 ++++++++++++++++++++++++++++++++++++-------------------------
memory.c | 5 +-
3 files changed, 143 insertions(+), 99 deletions(-)
--
1.8.3.1
2:08 a.m.
New subject: [PATCH v2 0/7] zram related changes for zram support of crash gcore command
----Original Message-----
This patch set is to make changes I found necessary during
development
of zram support for crash gcore command.
Here are tiny script and program I made to test the zram feature.
This may help your reviewing.
https://github.com/d-hatayama/some_stuff_for_crash_zram_devel
v2:
- Fix compilation error when without lzo library, which is fixed by
newly added 5-th patch to include zram even without lzo library.
- Add 6-th patch aiming to warn that given crash utility is built
without lzo library when encoutering zram pages.
HATAYAMA Daisuke (7):
diskdump, zram: cleanup try_zram_decompress()
diskdump, zram: initialize zram symbol information when needed
diskname, zram: fix fault error when reading zram disk with no symbol
information
diskname, zram: Notify necessity of loading zram module
zram: include zram code even without lzo library
zram: Add warning message when crash is built without lzo library
memory, zram: introduce and export readswap()
This v2 series look good to me.
Acked-by: Kazuhito Hagio <k-hagio-ab(a)nec.com>
Recently we accept more than 80 characters in a line, so
will adjust some lines.
Thanks,
Kazu
defs.h | 3 +-
diskdump.c | 234 ++++++++++++++++++++++++++++++++++++-------------------------
memory.c | 5 +-
3 files changed, 143 insertions(+), 99 deletions(-)
--
1.8.3.1
--
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10 comments
3 participants
participants (3)
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d.hatayama＠fujitsu.com -
HAGIO KAZUHITO(萩尾 一仁) -
HATAYAMA Daisuke