linux-kernel - Re: [PATCH 0/2] cgroup map files: Add a key/value map file type to cgroups

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Message-ID: <6599ad830802192225t5eb31cb5q9fca5b6ef2e03d71@mail.gmail.com>
Date:	Tue, 19 Feb 2008 22:25:34 -0800
From:	"Paul Menage" <menage@...gle.com>
To:	"YAMAMOTO Takashi" <yamamoto@...inux.co.jp>
Cc:	kamezawa.hiroyu@...fujitsu.com, akpm@...ux-foundation.org,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	balbir@...ibm.com, xemul@...nvz.org
Subject: Re: [PATCH 0/2] cgroup map files: Add a key/value map file type to cgroups

On Feb 19, 2008 10:14 PM, YAMAMOTO Takashi <yamamoto@...inux.co.jp> wrote:
> > On Feb 19, 2008 9:48 PM, YAMAMOTO Takashi <yamamoto@...inux.co.jp> wrote:
> > >
> > > it changes the format from "%s %lld" to "%s: %llu", right?
> > > why?
> > >
> >
> > The colon for consistency with maps in /proc. I think it also makes it
> > slightly more readable.
>
> can you be a little more specific?
>
> i object against the colon because i want to use the same parser for
> /proc/vmstat, which doesn't have colons.

Ah. This /proc behaviour of having multiple formats for reporting the
same kind of data (compare with /proc/meminfo, which does use colons)
is the kind of thing that I want to avoid with cgroups. i.e. if two
cgroup subsystems are both reporting the same kind of structured data,
then they should both use the same output format.

I guess since /proc has both styles, and memory.stat is the first file
reporting key/value pairs in cgroups, you get to call the format. OK,
I'll zap the colon.

Paul
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