tjh.dev / kernel
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memcg: fix zone congestion

ZONE_CONGESTED should be a state of global memory reclaim. If not, a busy
memcg sets this and give unnecessary throttoling in wait_iff_congested()
against memory recalim in other contexts. This makes system performance
bad.

I'll think about "memcg is congested!" flag is required or not, later.
But this fix is required first.

Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Reviewed-by: Minchan Kim <minchan.kim@gmail.com>
Cc: Daisuke Nishimura <nishimura@mxp.nes.nec.co.jp>
Acked-by: Ying Han <yinghan@google.com>
Cc: Balbir Singh <balbir@in.ibm.com>
Cc: Johannes Weiner <jweiner@redhat.com>
Cc: Michal Hocko <mhocko@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

authored by

KAMEZAWA Hiroyuki and committed by
Linus Torvalds d6c438b6 d5f33d45

+1 -1
+1 -1
mm/vmscan.c
··· 937 937 * back off and wait for congestion to clear because further reclaim 938 938 * will encounter the same problem 939 939 */ 940 - if (nr_dirty == nr_congested && nr_dirty != 0) 940 + if (nr_dirty && nr_dirty == nr_congested && scanning_global_lru(sc)) 941 941 zone_set_flag(zone, ZONE_CONGESTED); 942 942 943 943 free_page_list(&free_pages);