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SubjectRe: [PATCH v7 04/11] KVM: MMU: zap pages in batch
On 05/25/2013 04:34 AM, Marcelo Tosatti wrote:
> On Thu, May 23, 2013 at 03:55:53AM +0800, Xiao Guangrong wrote:
>> Zap at lease 10 pages before releasing mmu-lock to reduce the overload
>> caused by requiring lock
>>
>> After the patch, kvm_zap_obsolete_pages can forward progress anyway,
>> so update the comments
>>
>> [ It improves kernel building 0.6% ~ 1% ]
>
> Can you please describe the overload in more detail? Under what scenario
> is kernel building improved?

Yes.

The scenario is we do kernel building, meanwhile, repeatedly read PCI rom
every one second.

[
echo 1 > /sys/bus/pci/devices/0000\:00\:03.0/rom
cat /sys/bus/pci/devices/0000\:00\:03.0/rom > /dev/null
]



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