From: Alasdair G Kergon <agk-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
To: Tejun Heo <tj-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
Cc: Kent Overstreet
<koverstreet-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>,
axboe-tSWWG44O7X1aa/9Udqfwiw@public.gmane.org,
device-mapper development
<dm-devel-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>,
david-FqsqvQoI3Ljby3iVrkZq2A@public.gmane.org,
linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
linux-bcache-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
Mikulas Patocka
<mpatocka-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>,
bharrosh-C4P08NqkoRlBDgjK7y7TUQ@public.gmane.org,
Vivek Goyal <vgoyal-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
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-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>
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
[not found] ` <1347055973-11581-1-git-send-email-koverstreet-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>
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
[not found] ` <1347055973-11581-3-git-send-email-koverstreet-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>
2012-09-08 19:36 ` Tejun Heo
[not found] ` <20120908193641.GB12773-RcKxWJ4Cfj1J2suj2OqeGauc2jM2gXBXkQQo+JxHRPFibQn6LdNjmg@public.gmane.org>
2012-09-10 0:28 ` Kent Overstreet
[not found] ` <20120910002810.GA23241-jC9Py7bek1znysI04z7BkA@public.gmane.org>
2012-09-10 15:25 ` Vivek Goyal
2012-09-10 17:22 ` Tejun Heo
[not found] ` <20120910172210.GC14103-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>
2012-09-10 20:24 ` Kent Overstreet
[not found] ` <20120910202435.GG16360-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>
2012-09-10 20:40 ` Tejun Heo
[not found] ` <20120910204010.GA32310-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>
2012-09-10 21:33 ` Kent Overstreet
[not found] ` <20120910213349.GH16360-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>
2012-09-10 21:37 ` Tejun Heo
2012-09-10 21:56 ` Kent Overstreet
[not found] ` <20120910215633.GA19739-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>
2012-09-10 22:09 ` Tejun Heo
[not found] ` <20120910220910.GB7677-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>
2012-09-10 22:50 ` [dm-devel] " Alasdair G Kergon
[not found] ` <20120910225057.GA10477-FDJ95KluN3Z0klwcnFlA1dvLeJWuRmrY@public.gmane.org>
2012-09-10 23:01 ` Tejun Heo
2012-09-10 23:06 ` Kent Overstreet
[not found] ` <CAOS58YO5puV2iPhwe0vbyEydPnR=eWPStNRm=xEpMeo-TMHCaw-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2012-09-10 23:09 ` Alasdair G Kergon
[not found] ` <20120910230917.GB10477-FDJ95KluN3Z0klwcnFlA1dvLeJWuRmrY@public.gmane.org>
2012-09-10 23:35 ` Tejun Heo
[not found] ` <20120910233502.GH7677-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>
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
[not found] ` <CAFR8ued=Le4B4i_Rf4eECXsVgKvce9J7bO9sDSS91PFzBZ6j5w-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2012-09-11 18:45 ` Tejun Heo
[not found] ` <20120911184553.GT7677-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>
2012-09-11 18:58 ` Muthu Kumar
2012-09-11 19:31 ` Kent Overstreet
[not found] ` <20120911193124.GI19739-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>
2012-09-11 20:00 ` Muthu Kumar
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20120910234534.GD10477@agk-dp.fab.redhat.com \
--to=agk-h+wxahxf7alqt0dzr+alfa@public.gmane.org \
--cc=axboe-tSWWG44O7X1aa/9Udqfwiw@public.gmane.org \
--cc=bharrosh-C4P08NqkoRlBDgjK7y7TUQ@public.gmane.org \
--cc=david-FqsqvQoI3Ljby3iVrkZq2A@public.gmane.org \
--cc=dm-devel-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org \
--cc=koverstreet-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org \
--cc=linux-bcache-u79uwXL29TY76Z2rM5mHXA@public.gmane.org \
--cc=linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org \
--cc=mpatocka-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org \
--cc=tj-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org \
--cc=vgoyal-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).