linux-kernel - Re: [thiscpuops upgrade 02/10] vmstat: Optimize zone counter modifications through the use of this cpu operations

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Message-ID: <4CEFDF89.3000500@kernel.org>
Date:	Fri, 26 Nov 2010 17:25:45 +0100
From:	Tejun Heo <tj@...nel.org>
To:	Christoph Lameter <cl@...ux.com>
CC:	akpm@...ux-foundation.org, Pekka Enberg <penberg@...helsinki.fi>,
	linux-kernel@...r.kernel.org,
	Eric Dumazet <eric.dumazet@...il.com>,
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
	Namhyung Kim <namhyung@...il.com>
Subject: Re: [thiscpuops upgrade 02/10] vmstat: Optimize zone counter modifications
 through the use of this cpu operations

On 11/24/2010 12:51 AM, Christoph Lameter wrote:
> this cpu operations can be used to slightly optimize the function. The
> changes will avoid some address calculations and replace them with the
> use of the percpu segment register.
> 
> If one would have this_cpu_inc_return and this_cpu_dec_return then it
> would be possible to optimize inc_zone_page_state and dec_zone_page_state even
> more.
> 
> Signed-off-by: Christoph Lameter <cl@...ux.com>

Looks correct to me but it would be nice to run this through sparse.

Thanks.

-- 
tejun
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