linux-kernel - [PATCH] tools/vm/page_owner_sort: filter out unneeded line

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Date:   Wed, 29 Apr 2020 14:29:40 +0900
From:   Changhee Han <ch0.han@....com>
To:     akpm@...ux-foundation.org
Cc:     vbabka@...e.cz, iamjoonsoo.kim@....com,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        linux-doc@...r.kernel.org, corbet@....net, ch0.han@....com
Subject: [PATCH] tools/vm/page_owner_sort: filter out unneeded line

To see a sorted result from page owner, it needs a tiresome
preprocessing work before running page_owner_sort. This patch simply
filters out a line which starts with "PFN" while reading page owner
report.

Signed-off-by: Changhee Han <ch0.han@....com>
---
 Documentation/vm/page_owner.rst | 3 +--
 tools/vm/page_owner_sort.c      | 5 +++--
 2 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/Documentation/vm/page_owner.rst b/Documentation/vm/page_owner.rst
index 0ed5ab8c7ab4..079f3f8c4784 100644
--- a/Documentation/vm/page_owner.rst
+++ b/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``.
diff --git a/tools/vm/page_owner_sort.c b/tools/vm/page_owner_sort.c
index d3a8755c039c..85eb65ea16d3 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 @@ 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);
 	}
 
-- 
2.17.1