From: Zhaoyang Huang Nowadays, ANDROID system replaces madivse with memory.reclaim to implement user space memory management which desires to reclaim a certain amount of memcg's memory. However, oversized reclaiming and high latency are observed as there is no limitation over nr_reclaimed inside try_to_shrink_lruvec when MGLRU enabled. Besides, this could also affect all none root_reclaim such as reclaim_high etc. The commit 'b82b530740b9' ("mm: vmscan: restore incremental cgroup iteration") introduces sc->memcg_full_walk to limit the walk range of mem_cgroup_iter. This commit would like to make single memcg's scanning more precised by judging if nr_reclaimed reached when sc->memcg_full_walk not set. Signed-off-by: Zhaoyang Huang --- mm/vmscan.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/mm/vmscan.c b/mm/vmscan.c index 670fe9fae5ba..03bda1094621 100644 --- a/mm/vmscan.c +++ b/mm/vmscan.c @@ -4832,8 +4832,8 @@ static bool should_abort_scan(struct lruvec *lruvec, struct scan_control *sc) int i; enum zone_watermarks mark; - /* don't abort memcg reclaim to ensure fairness */ - if (!root_reclaim(sc)) + /* don't abort full walk memcg reclaim to ensure fairness */ + if (!root_reclaim(sc) && sc->memcg_full_walk) return false; if (sc->nr_reclaimed >= max(sc->nr_to_reclaim, compact_gap(sc->order))) -- 2.25.1