The patch titled
Subject: mm/page_owner.c: remove redudant drain_all_pages
has been added to the -mm mm-unstable branch. Its filename is
mm-page_ownerc-remove-redudant-drain_all_pages.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-page_ownerc-remove-redudant-drain_all_pages.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: Zhenhua Huang <quic_zhenhuah@xxxxxxxxxxx>
Subject: mm/page_owner.c: remove redudant drain_all_pages
Date: Wed, 7 Sep 2022 16:01:13 +0800
Page owner info of pages in pcp list has already been reset:
free_unref_page
-> free_unref_page_prepare
-> free_pcp_prepare
-> free_pages_prepare which does page owner
reset
-> free_unref_page_commit which add pages into pcp list
It can also be confirmed from dump that page owner info of pcp pages are
correct. Hence there is no more need to drain when reading.
Link: https://lkml.kernel.org/r/1662537673-9392-1-git-send-email-quic_zhenhuah@xxxxxxxxxxx
Signed-off-by: Zhenhua Huang <quic_zhenhuah@xxxxxxxxxxx>
Cc: Mel Gorman <mgorman@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/page_owner.c | 2 --
1 file changed, 2 deletions(-)
--- a/mm/page_owner.c~mm-page_ownerc-remove-redudant-drain_all_pages
+++ a/mm/page_owner.c
@@ -524,8 +524,6 @@ read_page_owner(struct file *file, char
while (!pfn_valid(pfn) && (pfn & (MAX_ORDER_NR_PAGES - 1)) != 0)
pfn++;
- drain_all_pages(NULL);
-
/* Find an allocated page */
for (; pfn < max_pfn; pfn++) {
/*
_
Patches currently in -mm which might be from quic_zhenhuah@xxxxxxxxxxx are
mm-page_ownerc-remove-redudant-drain_all_pages.patch
