linux-kernel - Re: [PATCH] sched/numa: Avoid trapping faults and attempting migration of file-backed dirty pages

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

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@...hsingularity.net>

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

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