tools/vm/page_owner_sort.c: filter out unneeded line (5b94ce2f) · Commits · 戴 / test

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>

Documentation/vm/page_owner.rst

+1 −2

Original line number	Diff line number	Diff line
		@@ -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``.

tools/vm/page_owner_sort.c

+3 −2

Original line number	Diff line number	Diff line
		@@ -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);
		}

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