linux-kernel - Re: [PATCH] change cpuacct usage percpu format v2

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Message-Id: <20090227170258.6598809e.kamezawa.hiroyu@jp.fujitsu.com>
Date:	Fri, 27 Feb 2009 17:02:58 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	Paul Menage <menage@...gle.com>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	kenchen@...gle.com, "lizf@...fujitsu.com" <lizf@...fujitsu.com>,
	"balbir@...ux.vnet.ibm.com" <balbir@...ux.vnet.ibm.com>,
	mingo@...e.hu,
	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>
Subject: Re: [PATCH] change cpuacct usage percpu format v2

On Thu, 26 Feb 2009 23:55:06 -0800
Paul Menage <menage@...gle.com> wrote:

> On Thu, Feb 26, 2009 at 11:29 PM, KAMEZAWA Hiroyuki
> <kamezawa.hiroyu@...fujitsu.com> wrote:
> >
> > IIRC, there is physical cpu hotplug system and it can remove
> > cpus and change map. Considering a software which records
> > this information pediodically(like sar), its better to show id of cpu
> > in explict way.
> 
> Can we just use the read_map() handler for this instead?
> 
Ah, I forgeted that we have read_map handler.

Hmm...but read_map()'s fill handler format is "%s %llu\n"
For using read_map, I have to convert integer to string in this routine.

Will we add "%d:%llu\n" style fill() function ?

Thanks,
-Kame

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