The patch titled
Subject: tools/vm/page_owner_sort: fix -f option
has been added to the -mm mm-unstable branch. Its filename is
tools-vm-page_owner_sort-fix-f-option.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/tools-vm-page_owner_sort-fix-f-option.patch
This patch will later appear in the mm-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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------------------------------------------------------
From: Yixuan Cao <caoyixuan2019@xxxxxxxxxxxxxxxx>
Subject: tools/vm/page_owner_sort: fix -f option
Date: Fri, 12 Aug 2022 23:55:15 +0800
The -f option is to filter out the information of blocks whose memory has
not been released, I noticed some blocks should not be filtered out.
Commit 9cc7e96aa846 ("mm/page_owner: record timestamp and pid") records
the allocation timestamp (ts_nsec) of all pages.
Commit 866b48526217 ("mm/page_owner: record the timestamp of all pages
during free") records the free timestamp (free_ts_nsec) of all pages.
When the page is allocated for the first time, the initial value of
free_ts_nsec is 0, and the corresponding time will be obtained when the
page is released. But during reallocation the free_ts_nsec will not reset
to 0 again. In particular, when page migration occurs, these two
timestamps will be the same.
Now page_owner_sort removes all text blocks whose free_ts_nsec is not 0
when using -f option. However, this way can only select pages allocated
for the first time. If a freed page is reallocated, free_ts_nsec will be
less than ts_nsec; if page migration occurs, the two timestamps will be
equal. These cases should be considered as pages are not released.
So I fix the function is_need() to keep text blocks that meet the above
two conditions when using -f option.
Link: https://lkml.kernel.org/r/20220812155515.30846-1-caoyixuan2019@xxxxxxxxxxxxxxxx
Signed-off-by: Yixuan Cao <caoyixuan2019@xxxxxxxxxxxxxxxx>
Cc: Chongxi Zhao <zhaochongxi2019@xxxxxxxxxxxxxxxx>
Cc: Jiajian Ye <yejiajian2018@xxxxxxxxxxxxxxxx>
Cc: Yuhong Feng <yuhongf@xxxxxxxxxx>
Cc: Liam Mark <lmark@xxxxxxxxxxxxxx>
Cc: Georgi Djakov <georgi.djakov@xxxxxxxxxx>
Cc: Vlastimil Babka <vbabka@xxxxxxx>
Cc: Joonsoo Kim <iamjoonsoo.kim@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
tools/vm/page_owner_sort.c | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)
--- a/tools/vm/page_owner_sort.c~tools-vm-page_owner_sort-fix-f-option
+++ a/tools/vm/page_owner_sort.c
@@ -470,7 +470,12 @@ static bool match_str_list(const char *s
static bool is_need(char *buf)
{
- if ((filter & FILTER_UNRELEASE) && get_free_ts_nsec(buf) != 0)
+ __u64 ts_nsec, free_ts_nsec;
+
+ ts_nsec = get_ts_nsec(buf);
+ free_ts_nsec = get_free_ts_nsec(buf);
+
+ if ((filter & FILTER_UNRELEASE) && free_ts_nsec != 0 && ts_nsec < free_ts_nsec)
return false;
if ((filter & FILTER_PID) && !match_num_list(get_pid(buf), fc.pids, fc.pids_size))
return false;
_
Patches currently in -mm which might be from caoyixuan2019@xxxxxxxxxxxxxxxx are
tools-vm-page_owner_sort-fix-f-option.patch
