On Thu, Oct 03, 2019 at 01:38:46PM +0200, gregkh@xxxxxxxxxxxxxxxxxxx wrote:
The patch below does not apply to the 4.19-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable@xxxxxxxxxxxxxxx>.
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
From a94b525241c0fff3598809131d7cfcfe1d572d8c Mon Sep 17 00:00:00 2001
From: Yafang Shao <laoar.shao@xxxxxxxxx>
Date: Mon, 23 Sep 2019 15:36:54 -0700
Subject: [PATCH] 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.
[laoar.shao@xxxxxxxxx: introduce a helper compact_zone_counters_init()]
Link: http://lkml.kernel.org/r/1563869295-25748-1-git-send-email-laoar.shao@xxxxxxxxx
[akpm@xxxxxxxxxxxxxxxxxxxx: expand compact_zone_counters_init() into its single callsite, per mhocko]
[vbabka@xxxxxxx: squash compact_zone() list_head init as well]
Link: http://lkml.kernel.org/r/1fb6f7da-f776-9e42-22f8-bbb79b030b98@xxxxxxx
[akpm@xxxxxxxxxxxxxxxxxxxx: kcompactd_do_work(): avoid unnecessary initialization of cc.zone]
Link: http://lkml.kernel.org/r/1563789275-9639-1-git-send-email-laoar.shao@xxxxxxxxx
Fixes: 7f354a548d1c ("mm, compaction: add vmstats for kcompactd work")
Signed-off-by: Yafang Shao <laoar.shao@xxxxxxxxx>
Signed-off-by: Vlastimil Babka <vbabka@xxxxxxx>
Reviewed-by: Vlastimil Babka <vbabka@xxxxxxx>
Cc: David Rientjes <rientjes@xxxxxxxxxx>
Cc: Yafang Shao <shaoyafang@xxxxxxxxxxxxxx>
Cc: Mel Gorman <mgorman@xxxxxxxxxxxxxxxxxxx>
Cc: Michal Hocko <mhocko@xxxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
This was mostly due to unrelated code cleanups. I've queued up a
backport for 4.19 and 4.14, it's not needed on older kernels.
--
Thanks,
Sasha
