Re: [Xen-devel] [PATCH 2 of 4] xen, pod: Zero-check recently populated pages (checklast)

[Tim Deegan <tim@xxxxxxx>]

At 17:57 +0100 on 27 Jun (1340819849), George Dunlap wrote:
> # HG changeset patch
> # User George Dunlap <george.dunlap@xxxxxxxxxxxxx>
> # Date 1340815812 -3600
> # Node ID ea827c449088a1017b6e5a9564eb33df70f8a9c6
> # Parent  b4e1fec1c98f6cbad666a972f473854518c25500
> xen,pod: Zero-check recently populated pages (checklast)
> 
> When demand-populating pages due to guest accesses, check recently populated
> pages to see if we can reclaim them for the cache.  This should keep the PoD
> cache filled when the start-of-day scrubber is going through.
> 
> The number 128 was chosen by experiment.  Windows does its page
> scrubbing in parallel; while a small nubmer like 4 works well for
> single VMs, it breaks down as multiple vcpus are scrubbing different
> pages in parallel.  Increasing to 128 works well for higher numbers of
> vcpus.
> 
> v2:
>  - Wrapped some long lines
>  - unsigned int for index, unsigned long for array
> 
> Signed-off-by: George Dunlap <george.dunlap@xxxxxxxxxxxxx>

Acked-by: Tim Deegan <tim@xxxxxxx>

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