Re: [Xen-devel] [PATCH] x86/PoD: skip eager reclaim when possible

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 10.05.16 at 15:50, <andrew.cooper3@xxxxxxxxxx> wrote:
> On 10/05/16 14:44, Jan Beulich wrote:
>> Reclaiming pages is pointless when the cache can already satisfy all
>> outstanding PoD entries, and doing reclaims in that case can be very
>> harmful to performance when that memory gets used by the guest, but
>> only to store zeroes there.
>>
>> Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
> 
> Reviewed-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
> 
> Possibly worth mentioning a dd from /dev/zero as the most likely action
> to trigger this.

Well, I didn't want to because I think there are other means, like
mmap()-ing anonymous memory.

Jan


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