The patch titled
Subject: mm/vmscan: remove redundant current_may_throttle() check
has been added to the -mm tree. Its filename is
mm-vmscan-remove-redundant-current_may_throttle-check.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mm-vmscan-remove-redundant-current_may_throttle-check.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mm-vmscan-remove-redundant-current_may_throttle-check.patch
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------------------------------------------------------
From: Andrey Ryabinin <aryabinin@xxxxxxxxxxxxx>
Subject: mm/vmscan: remove redundant current_may_throttle() check
Only kswapd can have non-zero nr_immediate, and current_may_throttle() is
always true for kswapd (PF_LESS_THROTTLE bit is never set) thus it's
enough to check stat.nr_immediate only.
Link: http://lkml.kernel.org/r/20180315164553.17856-4-aryabinin@xxxxxxxxxxxxx
Signed-off-by: Andrey Ryabinin <aryabinin@xxxxxxxxxxxxx>
Cc: Shakeel Butt <shakeelb@xxxxxxxxxx>
Cc: Mel Gorman <mgorman@xxxxxxxxxxxxxxxxxxx>
Cc: Tejun Heo <tj@xxxxxxxxxx>
Cc: Johannes Weiner <hannes@xxxxxxxxxxx>
Cc: Michal Hocko <mhocko@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
diff -puN mm/vmscan.c~mm-vmscan-remove-redundant-current_may_throttle-check mm/vmscan.c
--- a/mm/vmscan.c~mm-vmscan-remove-redundant-current_may_throttle-check
+++ a/mm/vmscan.c
@@ -1806,7 +1806,7 @@ shrink_inactive_list(unsigned long nr_to
* that pages are cycling through the LRU faster than
* they are written so also forcibly stall.
*/
- if (stat.nr_immediate && current_may_throttle())
+ if (stat.nr_immediate)
congestion_wait(BLK_RW_ASYNC, HZ/10);
}
_
Patches currently in -mm which might be from aryabinin@xxxxxxxxxxxxx are
mm-vmscan-wake-up-flushers-for-legacy-cgroups-too.patch
mm-vmscan-update-stale-comments.patch
mm-vmscan-replace-mm_vmscan_lru_shrink_inactive-with-shrink_page_list-tracepoint.patch
mm-vmscan-remove-redundant-current_may_throttle-check.patch
mm-vmscan-dont-change-pgdat-state-on-base-of-a-single-lru-list-state.patch
mm-vmscan-dont-mess-with-pgdat-flags-in-memcg-reclaim.patch
mm-kasan-dont-vfree-nonexistent-vm_area.patch
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