The patch titled Subject: mm/compaction.c: clear total_{migrate,free}_scanned before scanning a new zone has been added to the -mm tree. Its filename is mm-compaction-clear-total_migratefree_scanned-before-scanning-a-new-zone.patch

This patch should soon appear at http://ozlabs.org/~akpm/mmots/broken-out/mm-compaction-clear-total_migratefr... and later at http://ozlabs.org/~akpm/mmotm/broken-out/mm-compaction-clear-total_migratefr...

Before you just go and hit "reply", please: a) Consider who else should be cc'ed b) Prefer to cc a suitable mailing list as well c) Ideally: find the original patch on the mailing list and do a reply-to-all to that, adding suitable additional cc's

*** Remember to use Documentation/process/submit-checklist.rst when testing your code ***

The -mm tree is included into linux-next and is updated there every 3-4 working days

------------------------------------------------------ From: Yafang Shao laoar.shao@gmail.com Subject: mm/compaction.c: clear total_{migrate,free}_scanned before scanning a new zone

total_{migrate,free}_scanned will be added to COMPACTMIGRATE_SCANNED and COMPACTFREE_SCANNED in compact_zone(). We should clear them before scanning a new zone. In the proc triggered compaction, we forgot clearing them.

Link: http://lkml.kernel.org/r/1563789275-9639-1-git-send-email-laoar.shao@gmail.c... Fixes: 7f354a548d1c ("mm, compaction: add vmstats for kcompactd work") Signed-off-by: Yafang Shao laoar.shao@gmail.com Cc: David Rientjes rientjes@google.com Cc: Vlastimil Babka vbabka@suse.cz Cc: Yafang Shao shaoyafang@didiglobal.com Cc: Mel Gorman mgorman@techsingularity.net Cc: stable@vger.kernel.org Signed-off-by: Andrew Morton akpm@linux-foundation.org ---

mm/compaction.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/mm/compaction.c~mm-compaction-clear-total_migratefree_scanned-before-scanning-a-new-zone +++ a/mm/compaction.c @@ -2408,8 +2408,6 @@ static void compact_node(int nid) struct zone *zone; struct compact_control cc = { .order = -1, - .total_migrate_scanned = 0, - .total_free_scanned = 0, .mode = MIGRATE_SYNC, .ignore_skip_hint = true, .whole_zone = true, @@ -2425,6 +2423,8 @@ static void compact_node(int nid)

cc.nr_freepages = 0; cc.nr_migratepages = 0; + cc.total_migrate_scanned = 0; + cc.total_free_scanned = 0; cc.zone = zone; INIT_LIST_HEAD(&cc.freepages); INIT_LIST_HEAD(&cc.migratepages); _

Patches currently in -mm which might be from laoar.shao@gmail.com are

mm-vmscan-expose-cgroup_ino-for-memcg-reclaim-tracepoints.patch mm-compaction-clear-total_migratefree_scanned-before-scanning-a-new-zone.patch