linux-kernel - Re: [PATCH -V3 01/11] percpu_counters: make fbc->count read atomic on 32 bit architecture

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Message-Id: <20080827210652.dcbe5ff4.akpm@linux-foundation.org>
Date:	Wed, 27 Aug 2008 21:06:52 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>
Cc:	cmm@...ibm.com, tytso@....edu, sandeen@...hat.com,
	linux-ext4@...r.kernel.org, a.p.zijlstra@...llo.nl,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH -V3 01/11] percpu_counters: make fbc->count read atomic
 on 32 bit architecture

On Thu, 28 Aug 2008 09:18:16 +0530 "Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com> wrote:

> > This is now too large to be inlined.
> > 
> 
> 
> How do we actually figure that out ? I have been making that mistakes
> quiet often.

Well.  Experience and guesswork, mainly.

But a useful metric is to look and the /bin/size output before and
after the inlining.  In this case fs/ext3/ialloc.o's text shrunk 40-odd
bytes, which we think is a net benefit due to reduced CPU cache
pressure.


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