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

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Message-ID: <20181113053615.GJ21824@bombadil.infradead.org>
Date:   Mon, 12 Nov 2018 21:36:15 -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] vmscan: return NODE_RECLAIM_NOSCAN in node_reclaim()
 when CONFIG_NUMA is n

On Tue, Nov 13, 2018 at 12:17:50PM +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
> it is not proper to include "mm/internal.h", just hard coded it.

Since the return value is defined in mm/internal.h that means no code
outside mm/ can call node_reclaim (nor should it).  So let's move both
of node_reclaim's declarations to mm/internal.h instead of keeping them
in linux/swap.h.