linux-ext4 - Re: [PATCH 01/42] percpu counter: clean up percpu_counter_sum_and

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Date:	Thu, 9 Oct 2008 12:52:33 -0400
From:	Theodore Tso <tytso@....edu>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:	linux-ext4@...r.kernel.org, linux-kernel@...r.kernel.org,
	Mingming Cao <cmm@...ibm.com>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH 01/42] percpu counter: clean up
	percpu_counter_sum_and_set()

On Thu, Oct 09, 2008 at 10:52:52AM +0200, Peter Zijlstra wrote:
> On Thu, 2008-10-09 at 00:05 -0400, Theodore Ts'o wrote:
> > From: Mingming Cao <cmm@...ibm.com>
> > 
> > percpu_counter_sum_and_set() and percpu_counter_sum() is the same except
> > the former updates the global counter after accounting.  Since we are
> > taking the fbc->lock to calculate the precise value of the counter in
> > percpu_counter_sum() anyway, it should simply set fbc->count too, as the
> > percpu_counter_sum_and_set() does.
> > 
> > This patch merge these two interfaces into one.
> 
> I totally missed the patch introducing this _and_set() horror, but this
> does look like a good cleanup.

Note: this patch was in the -mm tree (Andrew signed off on it), but
given that a number of ext4 patches depend on it, we have a copy of it
in the ext4 tree.

						- Ted
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