linux-kernel - Re: UBIFS and page migration (take 3)

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Date:	Wed, 18 May 2016 11:03:43 +0200
From:	Richard Weinberger <richard@....at>
To:	Vlastimil Babka <vbabka@...e.cz>,
	Christoph Hellwig <hch@...radead.org>
Cc:	linux-fsdevel@...r.kernel.org, linux-mtd@...ts.infradead.org,
	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	boris.brezillon@...e-electrons.com,
	maxime.ripard@...e-electrons.com, david@...ma-star.at,
	david@...morbit.com, dedekind1@...il.com, alex@...tthing.co,
	akpm@...ux-foundation.org, sasha.levin@...cle.com,
	iamjoonsoo.kim@....com, rvaswani@...eaurora.org,
	tony.luck@...el.com, shailendra.capricorn@...il.com,
	kirill.shutemov@...ux.intel.com, hughd@...gle.com,
	mgorman@...hsingularity.net
Subject: Re: UBIFS and page migration (take 3)

Am 17.05.2016 um 13:27 schrieb Richard Weinberger:
> Vlastimil,
> 
> Am 16.05.2016 um 15:03 schrieb Vlastimil Babka:
>> On 05/16/2016 02:44 PM, Richard Weinberger wrote:
>>> MM folks, do we have a way to force page migration?
>>
>> On NUMA we have migrate_pages(2).
> 
> Doesn't this only migrate process (user) pages?
> AFAIK we need a way to force migration of pages which
> are in the page cache.

While migrate_pages(2) does not seem to hit the ->migratepage()
function, echo 1 > /proc/sys/vm/compact_memory does.
Thanks Vlastimil for pointing me in the right direction!

Just reproduce the issue on UBIFS in a KVM guest and a
simulated NAND. :-)
Let's see whether I can come up with a generic test.

Thanks,
//richard