linux-kernel - Re: [PATCH 2/9] mm: fix check for reclaimable pages in PF

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Message-ID: <077d01d29304$a7d4d060$f77e7120$@alibaba-inc.com>
Date:   Thu, 02 Mar 2017 11:25:34 +0800
From:   "Hillf Danton" <hillf.zj@...baba-inc.com>
To:     "'Johannes Weiner'" <hannes@...xchg.org>,
        "'Andrew Morton'" <akpm@...ux-foundation.org>
Cc:     "'Jia He'" <hejianet@...il.com>, "'Michal Hocko'" <mhocko@...e.cz>,
        "'Mel Gorman'" <mgorman@...e.de>, <linux-mm@...ck.org>,
        <linux-kernel@...r.kernel.org>, <kernel-team@...com>
Subject: Re: [PATCH 2/9] mm: fix check for reclaimable pages in PF_MEMALLOC reclaim throttling


On March 01, 2017 5:40 AM Johannes Weiner wrote: 
> 
> PF_MEMALLOC direct reclaimers get throttled on a node when the sum of
> all free pages in each zone fall below half the min watermark. During
> the summation, we want to exclude zones that don't have reclaimables.
> Checking the same pgdat over and over again doesn't make sense.
> 
> Fixes: 599d0c954f91 ("mm, vmscan: move LRU lists to node")
> Signed-off-by: Johannes Weiner <hannes@...xchg.org>
> ---
Acked-by: Hillf Danton <hillf.zj@...baba-inc.com>