The patch titled
Subject: mm, memcg: save some atomic ops when flush is already true
has been added to the -mm tree. Its filename is
mm-memcg-save-some-atomic-ops-when-flush-is-already-true.patch
This patch should soon appear at
https://ozlabs.org/~akpm/mmots/broken-out/mm-memcg-save-some-atomic-ops-when-flush-is-already-true.patch
and later at
https://ozlabs.org/~akpm/mmotm/broken-out/mm-memcg-save-some-atomic-ops-when-flush-is-already-true.patch
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------------------------------------------------------
From: Miaohe Lin <linmiaohe@xxxxxxxxxx>
Subject: mm, memcg: save some atomic ops when flush is already true
Add 'else' to save some atomic ops in obj_stock_flush_required() when
flush is already true. No functional change intended here.
Link: https://lkml.kernel.org/r/20210807082835.61281-3-linmiaohe@xxxxxxxxxx
Signed-off-by: Miaohe Lin <linmiaohe@xxxxxxxxxx>
Reviewed-by: Shakeel Butt <shakeelb@xxxxxxxxxx>
Reviewed-by: Muchun Song <songmuchun@xxxxxxxxxxxxx>
Acked-by: Roman Gushchin <guro@xxxxxx>
Acked-by: Michal Hocko <mhocko@xxxxxxxx>
Cc: Vladimir Davydov <vdavydov.dev@xxxxxxxxx>
Cc: Muchun Song <songmuchun@xxxxxxxxxxxxx>
Cc: Matthew Wilcox (Oracle) <willy@xxxxxxxxxxxxx>
Cc: Alex Shi <alexs@xxxxxxxxxx>
Cc: Wei Yang <richard.weiyang@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/memcontrol.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/mm/memcontrol.c~mm-memcg-save-some-atomic-ops-when-flush-is-already-true
+++ a/mm/memcontrol.c
@@ -2246,7 +2246,7 @@ static void drain_all_stock(struct mem_c
if (memcg && stock->nr_pages &&
mem_cgroup_is_descendant(memcg, root_memcg))
flush = true;
- if (obj_stock_flush_required(stock, root_memcg))
+ else if (obj_stock_flush_required(stock, root_memcg))
flush = true;
rcu_read_unlock();
_
Patches currently in -mm which might be from linmiaohe@xxxxxxxxxx are
mm-gup-remove-set-but-unused-local-variable-major.patch
mm-gup-remove-unneed-local-variable-orig_refs.patch
mm-gup-remove-useless-bug_on-in-__get_user_pages.patch
mm-gup-fix-potential-pgmap-refcnt-leak-in-__gup_device_huge.patch
mm-gup-use-helper-page_aligned-in-populate_vma_page_range.patch
mm-memcg-remove-unused-functions.patch
mm-memcg-save-some-atomic-ops-when-flush-is-already-true.patch
mm-vmscan-remove-the-pagedirty-check-after-madv_free-pages-are-page_ref_freezed.patch
mm-vmscan-remove-misleading-setting-to-sc-priority.patch
mm-vmscan-remove-unneeded-return-value-of-kswapd_run.patch
mm-vmscan-add-else-to-remove-check_pending-label.patch
mm-vmstat-correct-some-wrong-comments.patch
mm-vmstat-simplify-the-array-size-calculation.patch
mm-vmstat-remove-unneeded-return-value.patch
mm-zsmallocc-close-race-window-between-zs_pool_dec_isolated-and-zs_unregister_migration.patch
mm-zsmallocc-combine-two-atomic-ops-in-zs_pool_dec_isolated.patch
