linux-kernel - Re: [thisops uV2 02/10] vmstat: Optimize zone counter modifications through the use of this cpu operations

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Message-ID: <AANLkTinjh=A52zoWvWT1e2j8VJ65t50ss7jCODgcMPS_@mail.gmail.com>
Date:	Sat, 27 Nov 2010 10:00:58 +0200
From:	Pekka Enberg <penberg@...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>,
	Tejun Heo <tj@...nel.org>
Subject: Re: [thisops uV2 02/10] vmstat: Optimize zone counter modifications
 through the use of this cpu operations

On Fri, Nov 26, 2010 at 11:09 PM, Christoph Lameter <cl@...ux.com> 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.
>
> V1->V2:
>        - Fix __dec_zone_state overflow handling
>        - Use s8 variables for temporary storage.
>
> Signed-off-by: Christoph Lameter <cl@...ux.com>

Reviewed-by: Pekka Enberg <penberg@...nel.org>
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