Re: [patch]block: fix ioc locking warning
From: Shaohua Li
Date: Mon Feb 06 2012 - 19:45:45 EST
On Mon, 2012-02-06 at 16:39 -0800, Tejun Heo wrote:
> On Tue, Feb 07, 2012 at 08:31:22AM +0800, Shaohua Li wrote:
> > Since you are talking about performance, one of our microbenchmark (swap)
> > shows a regression. Alex bisect it to be b2efa05265d62bc2, which is related to
> > the ioc change. A little strange to me, don't expect such change can cause
> > performance issue. I haven't double check the issue, but if you have
> > ideas, please let me know.
> Hmmm... I think the only thing which can be made slower by that patch
> is ioc release (ie. task exits). What does the microbench do?
Quite simple, copy kernel source to tmpfs in tight memory environment.
This will trigger swap. The bisection result appears stable.
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