From: Alasdair G Kergon <agk@redhat.com>
To: Mike Snitzer <snitzer@redhat.com>
Cc: Mikulas Patocka <mpatocka@redhat.com>,
dm-devel@redhat.com, linux-fsdevel@vger.kernel.org,
linux-ext4@vger.kernel.org, axboe@kernel.dk,
dmonakhov@openvz.org
Subject: Re: [PATCH 4/4] Support discard if at least one underlying device supports it
Date: Fri, 2 Jul 2010 21:54:20 +0100 [thread overview]
Message-ID: <20100702205420.GM23989@agk-dp.fab.redhat.com> (raw)
In-Reply-To: <20100702204709.GB21915@redhat.com>
On Fri, Jul 02, 2010 at 04:47:09PM -0400, Mike Snitzer wrote:
> If a region doesn't support the discard
> DM has no business processing anything related to the discard (barriers
> included). It is as simple as that.
Indeed - if an I/O is going to fail, discover that as early as we can, trying
to avoid the relatively-expensive barrier process whenever we reasonably can.
Alasdair
next prev parent reply other threads:[~2010-07-02 20:54 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <Pine.LNX.4.64.1007021107420.7296@hs20-bc2-1.build.redhat.com>
[not found] ` <Pine.LNX.4.64.1007021112340.7296@hs20-bc2-1.build.redhat.com>
[not found] ` <Pine.LNX.4.64.1007021117580.7296@hs20-bc2-1.build.redhat.com>
[not found] ` <Pine.LNX.4.64.1007021118340.7296@hs20-bc2-1.build.redhat.com>
2010-07-02 17:50 ` [PATCH 3/4] Support discard for multiple devices Mike Snitzer
[not found] ` <Pine.LNX.4.64.1007021119070.7296@hs20-bc2-1.build.redhat.com>
[not found] ` <20100702181430.GD26916@redhat.com>
2010-07-02 19:49 ` [PATCH 4/4] Support discard if at least one underlying device supports it Mikulas Patocka
2010-07-02 20:00 ` Mikulas Patocka
2010-07-02 20:08 ` GFP_KERNEL in ext4 (was: [PATCH 4/4] Support discard if at least one underlying device supports it) Mikulas Patocka
2010-07-06 16:11 ` [PATCH] disallow FS recursion from sb_issue_discard allocation Mike Snitzer
2010-07-27 13:44 ` Ted Ts'o
2010-07-27 15:33 ` Mike Snitzer
2010-07-28 18:12 ` Jens Axboe
2010-07-28 23:15 ` Ted Ts'o
2010-07-02 20:47 ` [PATCH 4/4] Support discard if at least one underlying device supports it Mike Snitzer
2010-07-02 20:54 ` Alasdair G Kergon [this message]
2010-07-05 7:03 ` Dmitry Monakhov
2010-07-05 11:32 ` Mikulas Patocka
2010-07-02 20:29 ` Mike Snitzer
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