linux-kernel - Re: [PATCH] mm, migrate: count pages failing all retries in vmstat and tracepoint

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Message-ID: <alpine.DEB.2.10.1508271401040.30543@chino.kir.corp.google.com>
Date:	Thu, 27 Aug 2015 14:02:52 -0700 (PDT)
From:	David Rientjes <rientjes@...gle.com>
To:	Vlastimil Babka <vbabka@...e.cz>
cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	Naoya Horiguchi <n-horiguchi@...jp.nec.com>,
	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>,
	Konstantin Khlebnikov <koct9i@...il.com>
Subject: Re: [PATCH] mm, migrate: count pages failing all retries in vmstat
 and tracepoint

On Thu, 27 Aug 2015, Vlastimil Babka wrote:

> Migration tries up to 10 times to migrate pages that return -EAGAIN until it
> gives up. If some pages fail all retries, they are counted towards the number
> of failed pages that migrate_pages() returns. They should also be counted in
> the /proc/vmstat pgmigrate_fail and in the mm_migrate_pages tracepoint.
> 
> Signed-off-by: Vlastimil Babka <vbabka@...e.cz>

Acked-by: David Rientjes <rientjes@...gle.com>

I assume nothing else other than stats and tracepoints are affected by 
this and this isn't a critical bugfix :)
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