| Date | Mon, 27 May 2013 10:20:12 +0800 | From | Xiao Guangrong <> | Subject | Re: [PATCH v7 04/11] KVM: MMU: zap pages in batch |
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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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