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Date: Mon, 28 Mar 2022 09:08:34 +0800 From: "Huang, Ying" <ying.huang@...el.com> To: Wei Yang <richard.weiyang@...il.com> Cc: akpm@...ux-foundation.org, linux-mm@...ck.org, linux-kernel@...r.kernel.org, mgorman@...hsingularity.net Subject: Re: [PATCH 2/2] mm/vmscan: make sure wakeup_kswapd with managed zone Hi, Wei, Wei Yang <richard.weiyang@...il.com> writes: > wakeup_kswapd() only wake up kswapd when the zone is managed. > > For two callers of wakeup_kswapd(), they are node perspective. > > * wake_all_kswapds > * numamigrate_isolate_page > > If we picked up a !managed zone, this is not we expected. > > This patch makes sure we pick up a managed zone for wakeup_kswapd(). > > Signed-off-by: Wei Yang <richard.weiyang@...il.com> > --- > mm/migrate.c | 2 +- > mm/page_alloc.c | 2 ++ > 2 files changed, 3 insertions(+), 1 deletion(-) > > diff --git a/mm/migrate.c b/mm/migrate.c > index 3d60823afd2d..c4b654c0bdf0 100644 > --- a/mm/migrate.c > +++ b/mm/migrate.c > @@ -2046,7 +2046,7 @@ static int numamigrate_isolate_page(pg_data_t *pgdat, struct page *page) > if (!(sysctl_numa_balancing_mode & NUMA_BALANCING_MEMORY_TIERING)) > return 0; > for (z = pgdat->nr_zones - 1; z >= 0; z--) { > - if (populated_zone(pgdat->node_zones + z)) > + if (managed_zone(pgdat->node_zones + z)) This looks good to me! Thanks! It seems that we can replace populated_zone() in migrate_balanced_pgdat() too. Right? > break; > } > wakeup_kswapd(pgdat->node_zones + z, 0, order, ZONE_MOVABLE); > diff --git a/mm/page_alloc.c b/mm/page_alloc.c > index 4c0c4ef94ba0..6656c2d06e01 100644 > --- a/mm/page_alloc.c > +++ b/mm/page_alloc.c > @@ -4674,6 +4674,8 @@ static void wake_all_kswapds(unsigned int order, gfp_t gfp_mask, > > for_each_zone_zonelist_nodemask(zone, z, ac->zonelist, highest_zoneidx, > ac->nodemask) { > + if (!managed_zone(zone)) > + continue; > if (last_pgdat != zone->zone_pgdat) > wakeup_kswapd(zone, gfp_mask, order, highest_zoneidx); > last_pgdat = zone->zone_pgdat; Best Regards, Huang, Ying
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