linux-ext4 - Re: [PATCH 1/2] fs: Do not dispatch FITRIM through separate super

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Message-ID: <20110603020615.GZ561@dastard>
Date:	Fri, 3 Jun 2011 12:06:15 +1000
From:	Dave Chinner <david@...morbit.com>
To:	Kyungmin Park <kmpark@...radead.org>
Cc:	Chris Mason <chris.mason@...cle.com>,
	Lukas Czerner <lczerner@...hat.com>,
	Christoph Hellwig <hch@...radead.org>,
	Mark Lord <kernel@...savvy.com>,
	James Bottomley <james.bottomley@...e.de>,
	Matthew Wilcox <matthew@....cx>,
	Josef Bacik <josef@...hat.com>, tytso <tytso@....edu>,
	linux-ext4 <linux-ext4@...r.kernel.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	linux-fsdevel <linux-fsdevel@...r.kernel.org>,
	sandeen <sandeen@...hat.com>
Subject: Re: [PATCH 1/2] fs: Do not dispatch FITRIM through separate
 super_operation

On Thu, Jun 02, 2011 at 01:52:12PM +0900, Kyungmin Park wrote:
> On Wed, Dec 8, 2010 at 1:52 AM, Chris Mason <chris.mason@...cle.com> wrote:
> > Excerpts from Christoph Hellwig's message of 2010-12-07 04:27:49 -0500:
> >> On Fri, Nov 19, 2010 at 10:21:35AM -0500, Mark Lord wrote:
> >> > >I really hate to rely on this third party hearsay (from all sides), and
> >> > >have implement TRIM support in qemu now.  I'll soon install win7 and
> >> > >will check out the TRIM patters myself.
> >> >
> >> > Excellent!
> >>
> >> I did a Windows 7 installation under qemu today, and the result is:
> >
> > Great, thanks for testing this.
> >
> >>
> >>  - it TRIMs the whole device early during the installation
> >>  - after that I see a constant stream of small trims during the
> >>    installation.  It's using lots of non-contiguous ranges in a single
> >>    TRIM command, with sizes down to 8 sectors (4k) for a single range.
> >>  - after installation there's is some background-trimming going on
> >>    even when doing no user interaction with the VM at all.
> 
> Hi Lukas,
> 
> Now FITRIM is based on user interaction. So how about to implement the
> AUTO batched discard at kernel level?
> Idea is same as windows, make a single thread and iterate the
> superblocks and call the trim.

Surely this the responsibility of a userspace daemon and a config
file to decide and implement the background trim policy?

Cheers,

Dave.
-- 
Dave Chinner
david@...morbit.com
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