linux-kernel - Re: [RFC][-mm] Simple stats for cpu resource controller v3

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Message-Id: <200805030110.29511.balajirrao@gmail.com>
Date:	Sat, 3 May 2008 01:10:28 +0530
From:	Balaji Rao <balajirrao@...il.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	dhaval@...ux.vnet.ibm.com, linux-kernel@...r.kernel.org,
	containers@...ts.osdl.org, menage@...gle.com, balbir@...ibm.com,
	vatsa@...ux.vnet.ibm.com, a.p.zijlstra@...llo.nl
Subject: Re: [RFC][-mm] Simple stats for cpu resource controller v3

On Friday 02 May 2008 02:30:26 am Andrew Morton wrote:
<snip>

Hi Andrew,

Thank you for the review.
>
> Did you consider using include/linux/percpu_counter.h?
>
> If so, what was wrong with it?
>
> Because it would be much better to fix per-cpu counters than to invent new
> stuff.
No, I hadn't consider using the percpu_counters infrastructure. But today when 
I tried using it, I got an early exception.I guess its because I tried 
calling percpu_counter_init from within sched_init, which I perhaps shouldn't 
do, because percpu_counter_init expects cpu hotplug code to be initialized by 
then. Right ? Correct me if I'm wrong.

How about we start collecting statistics at a later stage i.e, after 
percpu_counter becomes usable ?

-- 
Warm Regards,

Balaji Rao
Dept. of Mechanical Engineering
NITK
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