linux-kernel - Re: [RFC][PATCH v7 08/14] writeback: add memcg fields to writeback

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Date:	Fri, 13 May 2011 18:41:20 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	Greg Thelen <gthelen@...gle.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	containers@...ts.osdl.org, linux-fsdevel@...r.kernel.org,
	Andrea Righi <arighi@...eler.com>,
	Balbir Singh <balbir@...ux.vnet.ibm.com>,
	Daisuke Nishimura <nishimura@....nes.nec.co.jp>,
	Minchan Kim <minchan.kim@...il.com>,
	Johannes Weiner <hannes@...xchg.org>,
	Ciju Rajan K <ciju@...ux.vnet.ibm.com>,
	David Rientjes <rientjes@...gle.com>,
	Wu Fengguang <fengguang.wu@...el.com>,
	Vivek Goyal <vgoyal@...hat.com>,
	Dave Chinner <david@...morbit.com>
Subject: Re: [RFC][PATCH v7 08/14] writeback: add memcg fields to
 writeback_control

On Fri, 13 May 2011 01:47:47 -0700
Greg Thelen <gthelen@...gle.com> wrote:

> Add writeback_control fields to differentiate between bdi-wide and
> per-cgroup writeback.  Cgroup writeback is also able to differentiate
> between writing inodes isolated to a particular cgroup and inodes shared
> by multiple cgroups.
> 
> Signed-off-by: Greg Thelen <gthelen@...gle.com>

Personally, I want to see new flags with their usage in a patch...


> ---
>  include/linux/writeback.h |    2 ++
>  1 files changed, 2 insertions(+), 0 deletions(-)
> 
> diff --git a/include/linux/writeback.h b/include/linux/writeback.h
> index d10d133..4f5c0d2 100644
> --- a/include/linux/writeback.h
> +++ b/include/linux/writeback.h
> @@ -47,6 +47,8 @@ struct writeback_control {
>  	unsigned for_reclaim:1;		/* Invoked from the page allocator */
>  	unsigned range_cyclic:1;	/* range_start is cyclic */
>  	unsigned more_io:1;		/* more io to be dispatched */
> +	unsigned for_cgroup:1;		/* enable cgroup writeback */
> +	unsigned shared_inodes:1;	/* write inodes spanning cgroups */
>  };


If shared_inode is really rare case...we don't need to have this shared_inodes
flag and do writeback shared_inode always.....No ?

Thanks,
-Kame

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