linux-kernel - Re: Bug in kernel 2.6.31, Slow wb

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Message-ID: <20090730015754.GC7326@localhost>
Date:	Thu, 30 Jul 2009 09:57:54 +0800
From:	Wu Fengguang <fengguang.wu@...el.com>
To:	Martin Bligh <mbligh@...gle.com>
Cc:	Chad Talbott <ctalbott@...gle.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	Michael Rubin <mrubin@...gle.com>,
	Andrew Morton <akpm@...gle.com>,
	"sandeen@...hat.com" <sandeen@...hat.com>,
	Michael Davidson <md@...gle.com>
Subject: Re: Bug in kernel 2.6.31, Slow wb_kupdate writeout

On Thu, Jul 30, 2009 at 09:12:26AM +0800, Martin Bligh wrote:
> > I agree on the unification of kupdate and sync paths. In fact I had a
> > patch for doing this. And I'd recommend to do it in two patches:
> > one to fix the congestion case, another to do the code unification.
> >
> > The sync path don't care whether requeue_io() or redirty_tail() is
> > used, because they disregard the time stamps totally - only order of
> > inodes matters (ie. starvation), which is same for requeue_io()/redirty_tail().
> 
> But, as I understand it, both paths share the same lists, so we still have
> to be consistent?

Then let's first unify the code, then fix the congestion case? :)

> Also, you set flags like more_io higher up in sync_sb_inodes() based on
> whether there's anything in s_more_io queue, so it still seems to have
> some effect to me?

Yes, maybe in some rare cases.
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