From: Pekka Enberg <penberg@cs.helsinki.fi>
To: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Hugh Dickins <hugh@veritas.com>,
Peter Zijlstra <a.p.zijlstra@chello.nl>,
Christoph Lameter <clameter@sgi.com>,
James Bottomley <James.Bottomley@HansenPartnership.com>,
Andrew Morton <akpm@linux-foundation.org>,
FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>,
Jens Axboe <jens.axboe@oracle.com>,
"Rafael J. Wysocki" <rjw@sisk.pl>,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH] scsi: fix sense_slab/bio swapping livelock
Date: Tue, 08 Apr 2008 00:39:58 +0300 [thread overview]
Message-ID: <47FA94AE.4070803@cs.helsinki.fi> (raw)
In-Reply-To: <47FA937E.6000009@cs.helsinki.fi>
Linus Torvalds wrote:
>> I suspect the right thing to do is not to mark them for "IO", but mark
>> them for "short-lived", and allow short-lived allocations that don't
>> have extended lifetimes to succeed even when a "real" allocation
>> wouldn't.
Pekka Enberg wrote:
> Yeah, makes sense. We do have GFP_TEMPORARY so we could associate this
> new semantics with that. But the real problem here is how to do the
> "allocate harder" part which, btw, sounds very similar to what Peter's
> kmalloc reserve patches try to do...
Actually, a trivial way to implement that is to have a few "emergency
kmalloc" caches say for sizes 64, 128, 256, and 512 that have some
pre-allocated pages into which these GFP_TEMPORARY allocations are
allowed to dip into on OOM and OOM only.
Pekka
next prev parent reply other threads:[~2008-04-07 21:41 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-04-06 22:56 [PATCH] scsi: fix sense_slab/bio swapping livelock Hugh Dickins
2008-04-06 23:35 ` James Bottomley
2008-04-07 1:01 ` Hugh Dickins
2008-04-07 17:51 ` Hugh Dickins
2008-04-07 18:04 ` James Bottomley
2008-04-07 18:26 ` Hugh Dickins
2008-04-07 2:48 ` FUJITA Tomonori
2008-04-07 18:07 ` Hugh Dickins
2008-04-08 14:04 ` FUJITA Tomonori
2008-04-07 5:26 ` Christoph Lameter
2008-04-07 19:40 ` Hugh Dickins
2008-04-07 19:55 ` Peter Zijlstra
2008-04-07 20:31 ` Hugh Dickins
2008-04-07 20:47 ` Peter Zijlstra
2008-04-07 21:00 ` Pekka Enberg
2008-04-07 21:05 ` Pekka Enberg
2008-04-07 21:15 ` Linus Torvalds
2008-04-07 21:34 ` Pekka Enberg
2008-04-07 21:39 ` Pekka Enberg [this message]
2008-04-07 22:05 ` Pekka J Enberg
2008-04-07 22:17 ` Linus Torvalds
2008-04-07 22:42 ` Pekka Enberg
2008-04-08 20:42 ` Pekka J Enberg
2008-04-08 20:44 ` Pekka Enberg
2008-04-08 20:45 ` Christoph Lameter
2008-04-08 21:11 ` Pekka Enberg
2008-04-08 21:40 ` Peter Zijlstra
2008-04-07 21:30 ` Hugh Dickins
2008-04-07 21:36 ` Pekka Enberg
2008-04-08 20:43 ` Christoph Lameter
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=47FA94AE.4070803@cs.helsinki.fi \
--to=penberg@cs.helsinki.fi \
--cc=James.Bottomley@HansenPartnership.com \
--cc=a.p.zijlstra@chello.nl \
--cc=akpm@linux-foundation.org \
--cc=clameter@sgi.com \
--cc=fujita.tomonori@lab.ntt.co.jp \
--cc=hugh@veritas.com \
--cc=jens.axboe@oracle.com \
--cc=linux-kernel@vger.kernel.org \
--cc=rjw@sisk.pl \
--cc=torvalds@linux-foundation.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 an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.