[119/131] tools/vm/page_owner_sort.c: filter out unneeded line

Commit Message

Andrew Morton June 3, 2020, 11:03 p.m. UTC

From: Changhee Han <[e-mail]>
Subject: 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.

Link: http://lkml.kernel.org/r/[e-mail]
Signed-off-by: Changhee Han <[e-mail]>
Reviewed-by: Andrew Morton <[e-mail]>
Cc: Vlastimil Babka <[e-mail]>
Cc: Joonsoo Kim <[e-mail]>
Cc: Jonathan Corbet <[e-mail]>
Signed-off-by: Andrew Morton <[e-mail]>
---

 Documentation/vm/page_owner.rst |    3 +--
 tools/vm/page_owner_sort.c      |    5 +++--
 2 files changed, 4 insertions(+), 4 deletions(-)

Patch

--- a/Documentation/vm/page_owner.rst~tools-vm-page_owner_sort-filter-out-unneeded-line
+++ a/Documentation/vm/page_owner.rst
@@ -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``.
--- a/tools/vm/page_owner_sort.c~tools-vm-page_owner_sort-filter-out-unneeded-line
+++ a/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 @@  int read_block(char *buf, int buf_size,
 	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);
 	}