tools/vm/page_owner_sort.c: filter out unneeded line
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>
diff --git a/Documentation/vm/page_owner.rst b/Documentation/vm/page_owner.rst
index 0ed5ab8..079f3f8 100644
--- a/Documentation/vm/page_owner.rst
+++ b/Documentation/vm/page_owner.rst
@@ -83,8 +83,7 @@
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``.
diff --git a/tools/vm/page_owner_sort.c b/tools/vm/page_owner_sort.c
index d3a8755..85eb65e 100644
--- a/tools/vm/page_owner_sort.c
+++ b/tools/vm/page_owner_sort.c
@@ -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 @@
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);
}
