Messages in this thread | | | Subject | Re: [patch]block: fix ioc locking warning | From | Shaohua Li <> | Date | Tue, 07 Feb 2012 09:33:20 +0800 |
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On Tue, 2012-02-07 at 09:10 +0800, Shaohua Li wrote: > On Mon, 2012-02-06 at 16:59 -0800, Tejun Heo wrote: > > On Tue, Feb 07, 2012 at 08:43:50AM +0800, Shaohua Li wrote: > > > Quite simple, copy kernel source to tmpfs in tight memory environment. > > > This will trigger swap. The bisection result appears stable. > > > > Looked through the commit again but it really doesn't change fast > > paths. The only paths which can be slower are ioc and q exits. Can > > you please do the followings? > > > > * Share the script used for microbench. Maybe it somehow exposes > > slower exit path? How much regression are we talking about? > I need strip the script out from our test framework, but it essentially > is a 'time copy -a tmpfs/kernelsource tmpfs/copy'. The time increased > ~20% with 3.3-rc1. oops, I get confused about our swap and swap-cp test. The workload with regression is swap. which does 'time kernelbuild tmpfs/kernelsource'. we run several such kernelbuild in the meantime to trigger swap. Very sorry to give your wrong info before.
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