linux-kernel - Re: [PATCH 8/8] vm: Add an tuning knob for vm.max_writeback

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Date:	Wed, 9 Sep 2009 14:44:50 +0200
From:	Jens Axboe <jens.axboe@...cle.com>
To:	Christoph Hellwig <hch@...radead.org>
Cc:	Wu Fengguang <fengguang.wu@...el.com>,
	Chris Mason <chris.mason@...cle.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Artem Bityutskiy <dedekind1@...il.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>,
	"david@...morbit.com" <david@...morbit.com>,
	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
	"jack@...e.cz" <jack@...e.cz>, Theodore Ts'o <tytso@....edu>
Subject: Re: [PATCH 8/8] vm: Add an tuning knob for vm.max_writeback_mb

On Wed, Sep 09 2009, Christoph Hellwig wrote:
> On Wed, Sep 09, 2009 at 02:37:46PM +0200, Jens Axboe wrote:
> > They are there, have been for months! But I think Christoph is a little
> > confused, we'll still do writeback inline from balance_dirty_pages(). It
> > does writeback_inodes_wbc(), which does not schedule async writeout.
> 
> Hmm, at least the version I have applied right now calls
> bdi_start_writeback and not writeback_inodes_wbc from
> balance_dirty_pages.  But you sent our another spin or two afer those,
> so maybe it changed again.

Yes, that's the very end check, the old code does the same. Further up
it does writeback_inodes_wbc() if we are over the threshold.

-- 
Jens Axboe

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