linux-kernel - Re: [PATCH 2/2] block: create ioctl to discard-or-zeroout a range of blocks

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Date:	Tue, 15 Mar 2016 17:38:21 -0500
From:	Eric Sandeen <esandeen@...hat.com>
To:	Dave Chinner <david@...morbit.com>,
	"Theodore Ts'o" <tytso@....edu>, Ric Wheeler <rwheeler@...hat.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andy Lutomirski <luto@...capital.net>,
	One Thousand Gnomes <gnomes@...rguk.ukuu.org.uk>,
	Gregory Farnum <greg@...gs42.com>,
	"Martin K. Petersen" <martin.petersen@...cle.com>,
	Christoph Hellwig <hch@...radead.org>,
	"Darrick J. Wong" <darrick.wong@...cle.com>,
	Jens Axboe <axboe@...nel.dk>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linux API <linux-api@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	shane.seymour@....com, Bruce Fields <bfields@...ldses.org>,
	linux-fsdevel <linux-fsdevel@...r.kernel.org>,
	Jeff Layton <jlayton@...chiereds.net>
Subject: Re: [PATCH 2/2] block: create ioctl to discard-or-zeroout a range of
 blocks

On 3/15/16 3:14 PM, Dave Chinner wrote:
> What we are missing is actual numbers that show that exposing stale
> data is a /significant/ win for these applications that are
> demanding it. And then we need evidence proving that the problem is
> actually systemic and not just a hack around a bad implementation of
> a feature...

Thanks Dave; I totally agree on this point.  We've spent more than enough
time talking about how and if to implement stale data exposure, but nowhere
in this thread has there been any actual performance data indicating why
we should do it at all.

-Eric