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tools/vm/page_owner_sort.c: filter out unneeded line

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To see a sorted result from page_owner, there must be a tiresome
preprocessing step before running page_owner_sort.  This patch simply
filters out lines which start with "PFN" while reading the page owner
report.

Signed-off-by: Changhee Han <ch0.han@lge.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Reviewed-by: Andrew Morton <akpm@linux-foundation.org>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Cc: Jonathan Corbet <corbet@lwn.net>
Link: http://lkml.kernel.org/r/20200429052940.16968-1-ch0.han@lge.com
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Changhee Han 2020-06-03 16:03:22 -07:00 committed by Linus Torvalds
parent 21e330fc63
commit 5b94ce2fca
2 changed files with 4 additions and 4 deletions
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3
Documentation/vm/page_owner.rst
View File

@ -83,8 +83,7 @@ Usage
4) Analyze information from page owner::
cat /sys/kernel/debug/page_owner > page_owner_full.txt
grep -v ^PFN page_owner_full.txt > page_owner.txt
./page_owner_sort page_owner.txt sorted_page_owner.txt
./page_owner_sort page_owner_full.txt sorted_page_owner.txt
See the result about who allocated each page
in the ``sorted_page_owner.txt``.

5
tools/vm/page_owner_sort.c
View File

@ -4,8 +4,7 @@
*
* Example use:
* cat /sys/kernel/debug/page_owner > page_owner_full.txt
* grep -v ^PFN page_owner_full.txt > page_owner.txt
* ./page_owner_sort page_owner.txt sorted_page_owner.txt
* ./page_owner_sort page_owner_full.txt sorted_page_owner.txt
*
* See Documentation/vm/page_owner.rst
*/
@ -38,6 +37,8 @@ int read_block(char *buf, int buf_size, FILE *fin)
while (buf_end - curr > 1 && fgets(curr, buf_end - curr, fin)) {
if (*curr == '\n') /* empty line */
return curr - buf;
if (!strncmp(curr, "PFN", 3))
continue;
curr += strlen(curr);
}