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

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Message-ID: <20181113074914.5kgiww44gpqit45y@master>
Date:   Tue, 13 Nov 2018 07:49:14 +0000
From:   Wei Yang <richard.weiyang@...il.com>
To:     Matthew Wilcox <willy@...radead.org>
Cc:     Wei Yang <richard.weiyang@...il.com>, 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 Mon, Nov 12, 2018 at 09:36:15PM -0800, Matthew Wilcox wrote:
>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.

That's reasonable, thanks.

-- 
Wei Yang
Help you, Help me