The patch titled
Subject: mm/memcg: set pos explicitly for reclaim and !reclaim
has been added to the -mm tree. Its filename is
mm-memcg-set-pos-explicitly-for-reclaim-and-reclaim.patch
This patch should soon appear at
https://ozlabs.org/~akpm/mmots/broken-out/mm-memcg-set-pos-explicitly-for-reclaim-and-reclaim.patch
and later at
https://ozlabs.org/~akpm/mmotm/broken-out/mm-memcg-set-pos-explicitly-for-reclaim-and-reclaim.patch
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------------------------------------------------------
From: Wei Yang <richard.weiyang@xxxxxxxxx>
Subject: mm/memcg: set pos explicitly for reclaim and !reclaim
During mem_cgroup_iter, there are two ways to get iteration position:
reclaim vs non-reclaim mode.
Let's do it explicitly for reclaim vs non-reclaim mode.
Link: https://lkml.kernel.org/r/20220330234719.18340-3-richard.weiyang@xxxxxxxxx
Signed-off-by: Wei Yang <richard.weiyang@xxxxxxxxx>
Reviewed-by: Roman Gushchin <roman.gushchin@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/memcontrol.c | 5 ++---
1 file changed, 2 insertions(+), 3 deletions(-)
--- a/mm/memcontrol.c~mm-memcg-set-pos-explicitly-for-reclaim-and-reclaim
+++ a/mm/memcontrol.c
@@ -1013,9 +1013,6 @@ struct mem_cgroup *mem_cgroup_iter(struc
if (!root)
root = root_mem_cgroup;
- if (prev && !reclaim)
- pos = prev;
-
rcu_read_lock();
if (reclaim) {
@@ -1041,6 +1038,8 @@ struct mem_cgroup *mem_cgroup_iter(struc
*/
(void)cmpxchg(&iter->position, pos, NULL);
}
+ } else if (prev) {
+ pos = prev;
}
if (pos)
_
Patches currently in -mm which might be from richard.weiyang@xxxxxxxxx are
mm-memcg-mz-already-removed-from-rb_tree-if-not-null.patch
mm-memcg-set-memcg-after-css-verified-and-got-reference.patch
mm-memcg-set-pos-explicitly-for-reclaim-and-reclaim.patch
mm-memcg-move-generation-assignment-and-comparison-together.patch
mm-page_alloc-add-same-penalty-is-enough-to-get-round-robin-order.patch
mm-vmscan-reclaim-only-affects-managed_zones.patch
mm-vmscan-make-sure-wakeup_kswapd-with-managed-zone.patch
mm-vmscan-sc-reclaim_idx-must-be-a-valid-zone-index.patch
