linux-ext4 - Re: [PATCH 2/2] Add batched discard support for ext4.

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Date:	Wed, 21 Apr 2010 17:03:45 -0400
From:	Ric Wheeler <rwheeler@...hat.com>
To:	sandeen@...hat.com
CC:	Eric Sandeen <esandeen@...hat.com>,
	Greg Freemyer <greg.freemyer@...il.com>,
	Jeff Moyer <jmoyer@...hat.com>,
	Mark Lord <kernel@...savvy.com>,
	Lukas Czerner <lczerner@...hat.com>,
	linux-ext4@...r.kernel.org, Edward Shishkin <eshishki@...hat.com>,
	Christoph Hellwig <hch@...adead.org>
Subject: Re: [PATCH 2/2] Add batched discard support for ext4.

On 04/21/2010 05:01 PM, Eric Sandeen wrote:
> On 04/21/2010 03:44 PM, Greg Freemyer wrote:
>
>    
>> Mark's benchmarks showed this as doable in seconds which seems like a
>> reasonable amount of time for a mount time operation.
>>      
> All the other things aside, mount-time is interesting, but it's an
> infrequent operation, at least in my world.  I think we need something
> that can be done runtime.
>
> For anything with uptime, I don't think it's acceptable to wait until
> the next mount to trim unused blocks.
>
> But as long as the mechanism can be called either at mount time and/or
> kicked off runtime somehow, I'm happy.
>
> -Eric
>    

That makes sense to me.  Most enterprise servers will go without 
remounting a file system for (hopefully!) a very long time.

It is really important to keep in mind that this is not just a laptop 
feature for laptop SSD's, this is also used by high end arrays and 
*could* be useful for virt IO, etc as well :-)

ric

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