linux-kernel - Re: [RFC][PATCH 2/3] memcg:: seq

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Message-Id: <20080521092849.c2f0b7e1.kamezawa.hiroyu@jp.fujitsu.com>
Date:	Wed, 21 May 2008 09:28:49 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	"Paul Menage" <menage@...gle.com>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	"balbir@...ux.vnet.ibm.com" <balbir@...ux.vnet.ibm.com>,
	"xemul@...nvz.org" <xemul@...nvz.org>,
	"lizf@...fujitsu.com" <lizf@...fujitsu.com>,
	"yamamoto@...inux.co.jp" <yamamoto@...inux.co.jp>
Subject: Re: [RFC][PATCH 2/3] memcg:: seq_ops support for cgroup

On Tue, 20 May 2008 11:46:46 -0700
"Paul Menage" <menage@...gle.com> wrote:

> On Tue, May 20, 2008 at 2:08 AM, KAMEZAWA Hiroyuki
> <kamezawa.hiroyu@...fujitsu.com> wrote:
> > Does anyone have a better idea ?
> 
> As a way of printing plain text files, it seems fine.
> 
> My concern is that it means that cgroups no longer has any idea about
> the typing of the data being returned, which will make it harder to
> integrate with a binary stats API. You'd end up having to have a
> separate reporting method for the same data to use it. That's why the
> "read_map" function specifically doesn't take a seq_file, but instead
> takes a key/value callback abstraction, which currently maps into a
> seq_file. For the binary stats API, we can use the same reporting
> functions, and just map into the binary API output.
> 
With current interface, my concern is hotplug.

File-per-node method requires delete/add files at hotplug.
A file for all nodes with _maps_ method cannot be used because
maps file says
==
The key/value pairs (and their ordering) should not
         * change between reboots.
==

And (*read) method isn't useful ;)

Can we add new stat file dynamically ?

Thanks,
-Kame





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