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Message-ID: <1522101564.6308.61.camel@surriel.com>
Subject: Re: [PATCH] sched/numa: Avoid trapping faults and attempting
 migration of file-backed dirty pages
From: Rik van Riel <riel@surriel.com>
Date: Mon, 26 Mar 2018 17:59:24 -0400
In-Reply-To: <20180326094334.zserdec62gwmmfqf@techsingularity.net>
References: <20180326094334.zserdec62gwmmfqf@techsingularity.net>
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To: Mel Gorman <mgorman@techsingularity.net>, Andrew Morton <akpm@linux-foundation.org>
Cc: Linux-MM <linux-mm@kvack.org>, LKML <linux-kernel@vger.kernel.org>


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On Mon, 2018-03-26 at 10:43 +0100, Mel Gorman wrote:
> change_pte_range is called from task work context to mark PTEs for
> receiving
> NUMA faulting hints. If the marked pages are dirty then migration may
> fail.
> Some filesystems cannot migrate dirty pages without blocking so are
> skipped
> in MIGRATE_ASYNC mode which just wastes CPU. Even when they can, it
> can
> be a waste of cycles when the pages are shared forcing higher scan
> rates.

> Signed-off-by: Mel Gorman <mgorman@techsingularity.net>

Reviewed-by: Rik van Riel <riel@surriel.com>

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