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Re: [Xen-devel] [PATCH][RFC] Serialize scrubbing pages

To: Kouya Shimura <kouya@xxxxxxxxxxxxxx>, <xen-devel@xxxxxxxxxxxxxxxxxxx>
Subject: Re: [Xen-devel] [PATCH][RFC] Serialize scrubbing pages
From: Keir Fraser <keir.fraser@xxxxxxxxxxxxx>
Date: Mon, 11 Aug 2008 11:12:14 +0100
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On 11/8/08 11:01, "Kouya Shimura" <kouya@xxxxxxxxxxxxxx> wrote:

> I noticed that parallel scrubbing pages is not efficient
> due to spinlock contention. (also memory bandwidth?)
> Actually heap_lock becomes a bottleneck.

I've considered the possibility of moving this kind of thing into a service
domain. Then it would be visible to the scheduler and be less of a hack.

Anyhow, I hadn't considered the contention for the heap_lock. I think your
patch is good and I will apply it for 3.3.

 -- Keir

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