linux-kernel - Re: [PATCH v2] vmscan: return NODE_RECLAIM_NOSCAN in node_reclaim() when CONFIG

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Date:   Tue, 13 Nov 2018 05:04:20 -0800
From:   Matthew Wilcox <willy@...radead.org>
To:     Wei Yang <richard.weiyang@...il.com>
Cc:     akpm@...ux-foundation.org, mgorman@...hsingularity.net,
        linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] vmscan: return NODE_RECLAIM_NOSCAN in node_reclaim()
 when CONFIG_NUMA is n

On Tue, Nov 13, 2018 at 04:04:36PM +0800, Wei Yang wrote:
> Commit fa5e084e43eb ("vmscan: do not unconditionally treat zones that
> fail zone_reclaim() as full") changed the return value of node_reclaim().
> The original return value 0 means NODE_RECLAIM_SOME after this commit.
> 
> While the return value of node_reclaim() when CONFIG_NUMA is n is not
> changed. This will leads to call zone_watermark_ok() again.
> 
> This patch fix the return value by adjusting to NODE_RECLAIM_NOSCAN. Since
> node_reclaim() is only called in page_alloc.c, move it to mm/internal.h.
> 
> Signed-off-by: Wei Yang <richard.weiyang@...il.com>

Reviewed-by: Matthew Wilcox <willy@...radead.org>