linux-kernel - Re: [PATCH v2] writeback: avoid race when update bandwidth

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Message-ID: <20120615002959.GA7384@localhost>
Date:	Fri, 15 Jun 2012 08:29:59 +0800
From:	Fengguang Wu <fengguang.wu@...el.com>
To:	Dave Chinner <david@...morbit.com>
Cc:	Wanpeng Li <liwp.linux@...il.com>, linux-kernel@...r.kernel.org,
	Gavin Shan <shangw@...ux.vnet.ibm.com>
Subject: Re: [PATCH v2] writeback: avoid race when update bandwidth

On Fri, Jun 15, 2012 at 10:06:33AM +1000, Dave Chinner wrote:
> On Thu, Jun 14, 2012 at 10:00:06PM +0800, Fengguang Wu wrote:
> > On Thu, Jun 14, 2012 at 12:05:59PM +1000, Dave Chinner wrote:
> > > On Wed, Jun 13, 2012 at 08:14:34PM +0800, Fengguang Wu wrote:
> > I wonder if anyone has a simple script for sorting lock_stat output
> > based on that (and perhaps other selectable) criterion? It should be
> > possible to write on myself, but still.. ;-)
> > 
> > Default lock_stat output is sorted by absolute number of contentions.
> 
> No that I know of. The default is pretty sane, because a highly
> contended lock that is causing performance problems will always show
> up near the top. If it's not in the top 10, then it's usually not
> worth worrying about until you've dealt with the those above it....

Okay, thanks for the tip!

Thanks,
Fengguang
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