linux-ext4 - Re: [PATCH 1/2] fs-writeback: Add helper function to start writeback if idle

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Date:	Fri, 18 Dec 2009 16:33:36 +0100
From:	Jens Axboe <jens.axboe@...cle.com>
To:	Eric Sandeen <sandeen@...hat.com>
Cc:	ext4 development <linux-ext4@...r.kernel.org>,
	linux-fsdevel@...r.kernel.org
Subject: Re: [PATCH 1/2] fs-writeback: Add helper function to start
	writeback   if idle

On Fri, Dec 18 2009, Eric Sandeen wrote:
> Jens Axboe wrote:
> > On Fri, Dec 11 2009, Eric Sandeen wrote:
> >> ext4, at least, would like to start pushing on writeback if it starts
> >> to get close to ENOSPC when reserving worst-case blocks for delalloc
> >> writes.  Writing out delalloc data will convert those worst-case
> >> predictions into usually smaller actual usage, freeing up space
> >> before we hit ENOSPC based on this speculation.
> >>
> >> Thanks to Jens for the suggestion for the helper function,
> >> & the naming help.
> >>
> >> I've made the helper return status on whether writeback was
> >> started even though I don't plan to use it in the ext4 patch;
> >> it seems like it would be potentially useful to test this
> >> in some cases.
> > 
> > Eric, how do you want to merge these? I can easily take this first one
> > through any branch, but I suppose the ext4 one should go through the
> > proper ext4 channels.
> 
> Doesn't matter to me really; maybe it'd be simpler if it all went
> though the ext4 tree so that there aren't any ordering problems?

Definately :-)

-- 
Jens Axboe

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