]> www.infradead.org Git - users/jedix/linux-maple.git/commit
mm/page_owner: record and dump free_pid and free_tgid
authorBarry Song <21cnbao@gmail.com>
Tue, 14 Nov 2023 03:42:02 +0000 (16:42 +1300)
committerAndrew Morton <akpm@linux-foundation.org>
Mon, 20 Nov 2023 21:16:33 +0000 (13:16 -0800)
commitd92b134dd1e407b9c59cd1053497caf5b5ee9f0a
treef8935eb334a4e94fac03cdc99e0cbb04ea4133ea
parent11a9b3bf197ae5f24f6d5f5ebe00881f0983a4b7
mm/page_owner: record and dump free_pid and free_tgid

While investigating some complex memory allocation and free bugs
especially in multi-processes and multi-threads cases, from time to time,
I feel the free stack isn't sufficient as a page can be freed by processes
or threads other than the one allocating it.  And other processes and
threads which free the page often have the exactly same free stack with
the one allocating the page.  We can't know who free the page only through
the free stack though the current page_owner does tell us the pid and tgid
of the one allocating the page.  This makes the bug investigation often
hard.

So this patch adds free pid and tgid in page_owner, so that we can easily
figure out if the freeing is crossing processes or threads.

Link: https://lkml.kernel.org/r/20231114034202.73098-1-v-songbaohua@oppo.com
Signed-off-by: Barry Song <v-songbaohua@oppo.com>
Cc: Audra Mitchell <audra@redhat.com>
Cc: Hyeonggon Yoo <42.hyeyoo@gmail.com>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Cc: Kassey Li <quic_yingangl@quicinc.com>
Cc: Kemeng Shi <shikemeng@huaweicloud.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
mm/page_owner.c