On March 01, 2017 5:40 AM Johannes Weiner wrote:

246e87a93934 ("memcg: fix get_scan_count() for small targets") sought
to avoid high reclaim priorities for kswapd by forcing it to scan a
minimum amount of pages when lru_pages >> priority yielded nothing.

b95a2f2d486d ("mm: vmscan: convert global reclaim to per-memcg LRU
lists"), due to switching global reclaim to a round-robin scheme over
all cgroups, had to restrict this forceful behavior to unreclaimable
zones in order to prevent massive overreclaim with many cgroups.

The latter patch effectively neutered the behavior completely for all
but extreme memory pressure. But in those situations we might as well
drop the reclaimers to lower priority levels. Remove the check.

Signed-off-by: Johannes Weiner <hannes@cmpxchg.org>
---
 mm/vmscan.c | 19 +++++--------------
 1 file changed, 5 insertions(+), 14 deletions(-)

Acked-by: Hillf Danton <redacted>


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