The patch titled
Subject: mm/memcg: move generation assignment and comparison together
has been added to the -mm tree. Its filename is
mm-memcg-move-generation-assignment-and-comparison-together.patch
This patch should soon appear at
https://ozlabs.org/~akpm/mmots/broken-out/mm-memcg-move-generation-assignment-and-comparison-together.patch
and later at
https://ozlabs.org/~akpm/mmotm/broken-out/mm-memcg-move-generation-assignment-and-comparison-together.patch
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------------------------------------------------------
From: Wei Yang <richard.weiyang@xxxxxxxxx>
Subject: mm/memcg: move generation assignment and comparison together
For each round-trip, we assign generation on first invocation and compare
it on subsequent invocations.
Let's move them together to make it more self-explaining. Also this
reduces a check on prev.
Link: https://lkml.kernel.org/r/20220225003437.12620-4-richard.weiyang@xxxxxxxxx
Signed-off-by: Wei Yang <richard.weiyang@xxxxxxxxx>
Cc: Johannes Weiner <hannes@xxxxxxxxxxx>
Cc: Michal Hocko <mhocko@xxxxxxxx>
Cc: Roman Gushchin <roman.gushchin@xxxxxxxxx>
Cc: Shakeel Butt <shakeelb@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/memcontrol.c | 11 ++++++++---
1 file changed, 8 insertions(+), 3 deletions(-)
--- a/mm/memcontrol.c~mm-memcg-move-generation-assignment-and-comparison-together
+++ a/mm/memcontrol.c
@@ -1045,7 +1045,14 @@ struct mem_cgroup *mem_cgroup_iter(struc
mz = root->nodeinfo[reclaim->pgdat->node_id];
iter = &mz->iter;
- if (prev && reclaim->generation != iter->generation)
+ /*
+ * On first invocation, assign iter->generation to
+ * reclaim->generation.
+ * On subsequent invocations, make sure no one else jump in.
+ */
+ if (!prev)
+ reclaim->generation = iter->generation;
+ else if (reclaim->generation != iter->generation)
goto out_unlock;
while (1) {
@@ -1105,8 +1112,6 @@ struct mem_cgroup *mem_cgroup_iter(struc
if (!memcg)
iter->generation++;
- else if (!prev)
- reclaim->generation = iter->generation;
}
out_unlock:
_
Patches currently in -mm which might be from richard.weiyang@xxxxxxxxx are
mm-memcg-mem_cgroup_per_node-is-already-set-to-0-on-allocation.patch
mm-memcg-retrieve-parent-memcg-from-cssparent.patch
mm-memcg-set-memcg-after-css-verified-and-got-reference.patch
mm-memcg-set-pos-to-prev-unconditionally.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-page_alloc-add-penalty-to-local_node.patch
memcg-do-not-tweak-node-in-alloc_mem_cgroup_per_node_info.patch
