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Date:   Wed, 25 Jan 2017 10:24:43 +0100
From:   Vlastimil Babka <>
To:     Mel Gorman <>,
        Andrew Morton <>
Cc:     Tejun Heo <>,
        Linux Kernel <>,
        Linux-MM <>,
        Hillf Danton <>,
        Jesper Dangaard Brouer <>
Subject: Re: [PATCH] mm, page_alloc: Use static global work_struct for
 draining per-cpu pages

On 01/25/2017 09:30 AM, Mel Gorman wrote:
> As suggested by Vlastimil Babka and Tejun Heo, this patch uses a static
> work_struct to co-ordinate the draining of per-cpu pages on the workqueue.
> Only one task can drain at a time but this is better than the previous
> scheme that allowed multiple tasks to send IPIs at a time.
> One consideration is whether parallel requests should synchronise against
> each other. This patch does not synchronise for a global drain as the common
> case for such callers is expected to be multiple parallel direct reclaimers
> competing for pages when the watermark is close to min. Draining the per-cpu
> list is unlikely to make much progress and serialising the drain is of
> dubious merit. Drains are synchonrised for callers such as memory hotplug
> and CMA that care about the drain being complete when the function returns.
> Signed-off-by: Mel Gorman <>

Acked-by: Vlastimil Babka <>

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