Re: [PATCH V3 2/8] Make TestSetPageDirty and dirty page accountingin one func

From: Michal Hocko
Date: Sat Jan 05 2013 - 05:45:31 EST

On Sat 05-01-13 10:49:00, Sha Zhengju wrote:
> >> Here is some test numbers that before/after this patch:
> >> Test steps(Mem-4g, ext4):
> >> drop_cache; sync
> >> fio (ioengine=sync/write/buffered/bs=4k/size=1g/numjobs=2/group_reporting/thread)
> >
> > Could also add some rationale why you think this test is relevant?
> >
> The test is aiming at finding the impact of performance due to lock
> contention by writing parallel
> to the same file. I'll add the reason next version too.

Please make sure to describe which locks are exercised during that test
and how much.

Michal Hocko
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