[merged mm-stable] vmscan-memcg-sleep-when-flushing-stats-during-reclaim.patch removed from -mm tree

[merged mm-stable] vmscan-memcg-sleep-when-flushing-stats-during-reclaim.patch removed from -mm tree

[Andrew Morton]

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The quilt patch titled
     Subject: vmscan: memcg: sleep when flushing stats during reclaim
has been removed from the -mm tree.  Its filename was
     vmscan-memcg-sleep-when-flushing-stats-during-reclaim.patch

This patch was dropped because it was merged into the mm-stable branch
of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

------------------------------------------------------
From: Yosry Ahmed <yosryahmed@google.com>
Subject: vmscan: memcg: sleep when flushing stats during reclaim
Date: Thu, 30 Mar 2023 19:18:00 +0000

Memory reclaim is a sleepable context.  Flushing is an expensive operaiton
that scales with the number of cpus and the number of cgroups in the
system, so avoid doing it atomically unnecessarily.  This can slow down
reclaim code if flushing stats is taking too long, but there is already
multiple cond_resched()'s in reclaim code.

Link: https://lkml.kernel.org/r/20230330191801.1967435-8-yosryahmed@google.com
Signed-off-by: Yosry Ahmed <yosryahmed@google.com>
Acked-by: Shakeel Butt <shakeelb@google.com>
Acked-by: Johannes Weiner <hannes@cmpxchg.org>
Acked-by: Michal Hocko <mhocko@suse.com>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: Josef Bacik <josef@toxicpanda.com>
Cc: Michal Hocko <mhocko@kernel.org>
Cc: Michal Koutný <mkoutny@suse.com>
Cc: Muchun Song <muchun.song@linux.dev>
Cc: Roman Gushchin <roman.gushchin@linux.dev>
Cc: Tejun Heo <tj@kernel.org>
Cc: Vasily Averin <vasily.averin@linux.dev>
Cc: Zefan Li <lizefan.x@bytedance.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 mm/vmscan.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/mm/vmscan.c~vmscan-memcg-sleep-when-flushing-stats-during-reclaim
+++ a/mm/vmscan.c
@@ -2861,7 +2861,7 @@ static void prepare_scan_count(pg_data_t
 	 * Flush the memory cgroup stats, so that we read accurate per-memcg
 	 * lruvec stats for heuristics.
 	 */
-	mem_cgroup_flush_stats_atomic();
+	mem_cgroup_flush_stats();
 
 	/*
 	 * Determine the scan balance between anon and file LRUs.
_

Patches currently in -mm which might be from yosryahmed@google.com are

memcg-do-not-modify-rstat-tree-for-zero-updates.patch
memcg-page_cgroup_ino-get-memcg-from-the-pages-folio.patch
mm-vmscan-ignore-non-lru-based-reclaim-in-memcg-reclaim.patch
mm-vmscan-move-set_task_reclaim_state-near-flush_reclaim_state.patch
mm-vmscan-refactor-updating-current-reclaim_state.patch