The patch titled
Subject: mm, memcontrol: avoid duplicated memcg enable check
has been added to the -mm mm-unstable branch. Its filename is
mm-memcontrol-avoid-duplicated-memcg-enable-check.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-memcontrol-avoid-duplicated-memcg-enable-check.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: Kairui Song <kasong@xxxxxxxxxxx>
Subject: mm, memcontrol: avoid duplicated memcg enable check
Date: Wed, 18 Dec 2024 19:46:30 +0800
Patch series "mm/swap_cgroup: remove global swap cgroup lock", v3.
This series removes the global swap cgroup lock. The critical section of
this lock is very short but it's still a bottle neck for mass parallel
swap workloads.
Up to 10% performance gain for tmpfs build kernel test on a 48c96t system
under memory pressure, and no regression for other cases:
This patch (of 3):
mem_cgroup_uncharge_swap() includes a mem_cgroup_disabled() check,
so the caller doesn't need to check that.
Link: https://lkml.kernel.org/r/20241218114633.85196-1-ryncsn@xxxxxxxxx
Link: https://lkml.kernel.org/r/20241218114633.85196-2-ryncsn@xxxxxxxxx
Signed-off-by: Kairui Song <kasong@xxxxxxxxxxx>
Reviewed-by: Yosry Ahmed <yosryahmed@xxxxxxxxxx>
Reviewed-by: Roman Gushchin <roman.gushchin@xxxxxxxxx>
Acked-by: Shakeel Butt <shakeel.butt@xxxxxxxxx>
Acked-by: Chris Li <chrisl@xxxxxxxxxx>
Cc: Barry Song <baohua@xxxxxxxxxx>
Cc: Hugh Dickins <hughd@xxxxxxxxxx>
Cc: Johannes Weiner <hannes@xxxxxxxxxxx>
Cc: Michal Hocko <mhocko@xxxxxxxxxx>
Cc: Yosry Ahmed <yosryahmed@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/memcontrol.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/mm/memcontrol.c~mm-memcontrol-avoid-duplicated-memcg-enable-check
+++ a/mm/memcontrol.c
@@ -4595,7 +4595,7 @@ void mem_cgroup_swapin_uncharge_swap(swp
* correspond 1:1 to page and swap slot lifetimes: we charge the
* page to memory here, and uncharge swap when the slot is freed.
*/
- if (!mem_cgroup_disabled() && do_memsw_account()) {
+ if (do_memsw_account()) {
/*
* The swap entry might not get freed for a long time,
* let's not wait for it. The page already received a
_
Patches currently in -mm which might be from kasong@xxxxxxxxxxx are
zram-refuse-to-use-zero-sized-block-device-as-backing-device.patch
zram-fix-uninitialized-zram-not-releasing-backing-device.patch
mm-memcontrol-avoid-duplicated-memcg-enable-check.patch
mm-swap_cgroup-remove-swap_cgroup_cmpxchg.patch
mm-swap_cgroup-remove-global-swap-cgroup-lock.patch
mm-swap_cgroup-decouple-swap-cgroup-recording-and-clearing.patch
