linux-kernel - Re: Early test: hangs in mm/compact.c w. Linus's 12d7aacab56e9ef185c

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Message-ID: <545F3556.5000802@suse.cz>
Date:	Sun, 09 Nov 2014 10:35:18 +0100
From:	Vlastimil Babka <vbabka@...e.cz>
To:	"P. Christeas" <xrg@...ux.gr>,
	Hillf Danton <hillf.zj@...baba-inc.com>,
	linux-kernel <linux-kernel@...r.kernel.org>
CC:	linux-mm@...ck.org
Subject: Re: Early test: hangs in mm/compact.c w. Linus's 12d7aacab56e9ef185c

On 11/09/2014 09:22 AM, P. Christeas wrote:
> On Sunday 09 November 2014, Hillf Danton wrote:
>> -		return COMPACT_CONTINUE;
>> +		return COMPACT_SKIPPED;
> 
> I guess this one would mitigate against Vlastmil's migration scanner issue, 
> wouldn't it?

Please no, that's a wrong fix. The purpose of compaction is to make the
high-order watermark meet, not give up.

> In that case, I should wait a bit[1] to try the first patch, then revert, try 
> yours and (hopefully) have some results.

I hope my patch will be enough,

> Then, apply both.
> 
> [1] trying to push the vm by loading memory-hungry apps and random load.

Maybe the tools/testing/selftests/vm/transhuge-stress could help

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