From: Alasdair G Kergon <agk@redhat.com>
To: Tejun Heo <tj@kernel.org>
Cc: Kent Overstreet <koverstreet@google.com>,
axboe@kernel.dk, device-mapper development <dm-devel@redhat.com>,
david@fromorbit.com, linux-kernel@vger.kernel.org,
linux-bcache@vger.kernel.org,
Mikulas Patocka <mpatocka@redhat.com>,
bharrosh@panasas.com, Vivek Goyal <vgoyal@redhat.com>
Subject: Re: [dm-devel] [PATCH 2/2] block: Avoid deadlocks with bio allocation by stacking drivers
Date: Tue, 11 Sep 2012 00:45:34 +0100 [thread overview]
Message-ID: <20120910234534.GD10477@agk-dp.fab.redhat.com> (raw)
In-Reply-To: <20120910233502.GH7677@google.com>
On Mon, Sep 10, 2012 at 04:35:02PM -0700, Tejun Heo wrote:
> debug. Would it be difficult to convert dm drivers to collect size
> requirements and use front-pad for all per-bio data?
I can't give a quick answer because a single bio may require a variable
number (depending on the bio content) of (sequential) mempool_allocs from the
same mempool to complete its processing, so we do have to audit all this very
carefully to see what can/can't be pulled out.
Alasdair
next prev parent reply other threads:[~2012-09-10 23:45 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-09-07 22:12 [PATCH 0/2] Avoid deadlocks with bio allocation Kent Overstreet
2012-09-07 22:12 ` [PATCH 1/2] block: Reorder struct bio_set Kent Overstreet
2012-09-07 22:12 ` [PATCH 2/2] block: Avoid deadlocks with bio allocation by stacking drivers Kent Overstreet
2012-09-08 19:36 ` Tejun Heo
2012-09-10 0:28 ` Kent Overstreet
2012-09-10 15:25 ` Vivek Goyal
2012-09-10 17:22 ` Tejun Heo
2012-09-10 20:24 ` Kent Overstreet
2012-09-10 20:40 ` Tejun Heo
2012-09-10 21:33 ` Kent Overstreet
2012-09-10 21:37 ` Tejun Heo
2012-09-10 21:56 ` Kent Overstreet
2012-09-10 22:09 ` Tejun Heo
2012-09-10 22:50 ` [dm-devel] " Alasdair G Kergon
2012-09-10 23:01 ` Tejun Heo
2012-09-10 23:06 ` Kent Overstreet
2012-09-10 23:09 ` Alasdair G Kergon
2012-09-10 23:35 ` Tejun Heo
2012-09-10 23:45 ` Alasdair G Kergon [this message]
2012-09-10 23:01 ` Kent Overstreet
2012-09-10 23:13 ` Tejun Heo
2012-09-11 18:36 ` Muthu Kumar
2012-09-11 18:45 ` Tejun Heo
2012-09-11 18:58 ` Muthu Kumar
2012-09-11 19:31 ` Kent Overstreet
2012-09-11 20:00 ` Muthu Kumar
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