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authorYixuan Cao <caoyixuan2019@email.szu.edu.cn>2022-08-12 18:55:15 +0300
committerAndrew Morton <akpm@linux-foundation.org>2022-09-12 06:25:51 +0300
commit57eb60c04d2c7b0de91eac2bc5d0331f8fe72fd7 (patch)
treecdb859cc89869bd7ae9057dde1b63787631d5e0a
parent2fd86a07c9ac50dfbc5eef3c69ef6e5d370f3b28 (diff)
downloadlinux-57eb60c04d2c7b0de91eac2bc5d0331f8fe72fd7.tar.xz
tools/vm/page_owner_sort: fix -f option
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@email.szu.edu.cn Signed-off-by: Yixuan Cao <caoyixuan2019@email.szu.edu.cn> Cc: Chongxi Zhao <zhaochongxi2019@email.szu.edu.cn> Cc: Jiajian Ye <yejiajian2018@email.szu.edu.cn> Cc: Yuhong Feng <yuhongf@szu.edu.cn> Cc: Liam Mark <lmark@codeaurora.org> Cc: Georgi Djakov <georgi.djakov@linaro.org> Cc: Vlastimil Babka <vbabka@suse.cz> Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
-rw-r--r--tools/vm/page_owner_sort.c7
1 files changed, 6 insertions, 1 deletions
diff --git a/tools/vm/page_owner_sort.c b/tools/vm/page_owner_sort.c
index ec2e67c85b84..ce860ab94162 100644
--- a/tools/vm/page_owner_sort.c
+++ b/tools/vm/page_owner_sort.c
@@ -470,7 +470,12 @@ static bool match_str_list(const char *str, char **list, int list_size)
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;