linux-kernel - Re: [PATCH 0/15] Per-bdi writeback flusher threads v10

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Date:	Fri, 19 Jun 2009 07:01:13 +0200
From:	Jens Axboe <jens.axboe@...cle.com>
To:	"Zhang, Yanmin" <yanmin_zhang@...ux.intel.com>
Cc:	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	chris.mason@...cle.com, david@...morbit.com, hch@...radead.org,
	akpm@...ux-foundation.org, jack@...e.cz, richard@....demon.co.uk,
	damien.wyart@...e.fr, dedekind1@...il.com, fweisbec@...il.com
Subject: Re: [PATCH 0/15] Per-bdi writeback flusher threads v10

On Fri, Jun 19 2009, Zhang, Yanmin wrote:
> > > > Sorry I should have made that more clear when posting v11. This patch
> > > > wont fully solve the problem, however the v11 patch series should. So if
> > > > you test with that, hopefully all soft hangs should be gone.
> > > Ok. I will start new testing against V11. I also add some debugging codes into
> > > V11.
> > 
> > Great, thanks! There's a small issue with v11 that you should be aware
> > of. The test for bdi_add_default_flusher_task() was inverted. I'm
> > attaching a diff at the end. The interesting bit is the 2nd hunk of
> > backing-dev.c, the others are just a cleanup.
> Jens,
> 
> I did entensive testing with fio (especially the aio randread which triggers
> the hang)/ffsb and a couple of other testing and didn't hit the hang issue.
> So V11 does fix the issue.

Great!

> From performance point of view, there is no big difference than old versions.

That's fine too, it's only been bug fixes the last few revisions. I'll
tag a v12 with the small fix.

-- 
Jens Axboe

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