From: Tejun Heo <tj@kernel.org>
To: Muthu Kumar <muthu.lkml@gmail.com>
Cc: Kent Overstreet <koverstreet@google.com>,
linux-bcache@vger.kernel.org, linux-kernel@vger.kernel.org,
dm-devel@redhat.com, axboe@kernel.dk,
Vivek Goyal <vgoyal@redhat.com>,
Mikulas Patocka <mpatocka@redhat.com>,
bharrosh@panasas.com, david@fromorbit.com
Subject: Re: [PATCH 2/2] block: Avoid deadlocks with bio allocation by stacking drivers
Date: Tue, 11 Sep 2012 11:45:53 -0700 [thread overview]
Message-ID: <20120911184553.GT7677@google.com> (raw)
In-Reply-To: <CAFR8ued=Le4B4i_Rf4eECXsVgKvce9J7bO9sDSS91PFzBZ6j5w@mail.gmail.com>
Hello,
On Tue, Sep 11, 2012 at 11:36:28AM -0700, Muthu Kumar wrote:
> Does this preserve the CPU from which the bio was submitted
> originally. Not familiar with cmwq, may be Tejun can clarify.
>
> Tejun - the question is, do we honor the rq_affinity with the above
> rescue worker implementation?
The work item would run from the same CPU but there isn't any
mechanism to keep track of the issuing CPU if there are multiple bios
to be rescued. Isn't rq_affinity an optimization hint? If so, I
don't think it matters here.
Thanks.
--
tejun
next prev parent reply other threads:[~2012-09-11 18:46 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
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 [this message]
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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