linux-ext4 - Re: [v7] ext4: Add support FALLOC_FL_COLLAPSE

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Date:	Tue, 8 Apr 2014 09:40:34 -0400
From:	Theodore Ts'o <tytso@....edu>
To:	Dave Chinner <david@...morbit.com>
Cc:	Namjae Jeon <linkinjeon@...il.com>, linux-ext4@...r.kernel.org
Subject: Re: [v7] ext4: Add support FALLOC_FL_COLLAPSE_RANGE for fallocate

On Tue, Apr 08, 2014 at 08:55:04PM +1000, Dave Chinner wrote:
> 
> If you check the xfstests commit history, I think you'll find that
> Namjae wrote the xfstests that triggered the failure you are
> seeing.
> 
> You're just testing more esoteric configurations than most people do
> - same as I do for XFS. We can't expect every developer to test
> their code on every possible configuration before they submit
> it.... ;)

"kvm-xfstests -g smoke" takes about 4-5 hours to run[1], and allows
all of the ext4 developers to run a much wider set of configurations.
The more work they can do, the more I scale.  This is one of the
reasons why I'm pushing the testing automation so heavily.  :-)

	       	      	  	 	    	- Ted

[1] It's even faster if you run kvm-xfstests on a sacrificial ssd, or
if you have a big enough machine to run using a series of 5g ramdisks.
"kvm-xfstests -g auto" takes about 14 hours to run with spinning
platters, so it's much more of a commitment.
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