linux-kernel - Re: [PATCH] Fix queueing work if !bdi_cap_writeback

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Message-ID: <20120917095623.GB9150@quack.suse.cz>
Date:	Mon, 17 Sep 2012 11:56:23 +0200
From:	Jan Kara <jack@...e.cz>
To:	OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>
Cc:	Jan Kara <jack@...e.cz>, Fengguang Wu <fengguang.wu@...el.com>,
	viro@...iv.linux.org.uk, hch@....de, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Fix queueing work if !bdi_cap_writeback_dirty()

On Mon 17-09-12 18:39:05, OGAWA Hirofumi wrote:
> Jan Kara <jack@...e.cz> writes:
> 
> >> I think you know how to solve it though. You can add the periodic flush
> >> in own task. And you can check bdi->dirty_exceeded in any handlers.
> >   Sure, you can have your private thread. That is possible but you will
> > have to duplicate flusher logic and you will still get odd behavior e.g.
> > when your filesystem is on one partition and another filesystem is on a
> > different partition of the same disk.
> 
> Right. But it is what current FSes are doing more or less.
  It's not. Page writeback is respected by all filesystems in most cases
AFAIK. Inode writeback is a different issue but that's not so interesting
from mm point of view...

								Honza
-- 
Jan Kara <jack@...e.cz>
SUSE Labs, CR
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