From: Jens Axboe <jens.axboe@oracle.com>
To: Ingo Molnar <mingo@elte.hu>
Cc: Linus Torvalds <torvalds@linux-foundation.org>,
Davide Libenzi <davidel@xmailserver.org>,
Ulrich Drepper <drepper@redhat.com>,
Jeff Garzik <jeff@garzik.org>, Zach Brown <zach.brown@oracle.com>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
Arjan van de Ven <arjan@infradead.org>,
Christoph Hellwig <hch@infradead.org>,
Andrew Morton <akpm@zip.com.au>,
Alan Cox <alan@lxorguk.ukuu.org.uk>,
Evgeniy Polyakov <johnpol@2ka.mipt.ru>,
"David S. Miller" <davem@davemloft.net>,
Suparna Bhattacharya <suparna@in.ibm.com>,
Thomas Gleixner <tglx@linutronix.de>
Subject: Re: Syslets, Threadlets, generic AIO support, v6
Date: Thu, 31 May 2007 11:34:51 +0200 [thread overview]
Message-ID: <20070531093449.GN32105@kernel.dk> (raw)
In-Reply-To: <20070531093202.GA4784@elte.hu>
On Thu, May 31 2007, Ingo Molnar wrote:
>
> * Ingo Molnar <mingo@elte.hu> wrote:
>
> > (i definitely remember having written code for that too, but i cannot
> > find that in the archives. hm.) In theory we could avoid _all_
> > fd-bitmap overhead as well and use a per-process list/pool of struct
> > file buffers plus a maximum-fd field as the 'non-linear fd allocator'
> > (at the price of only deallocating them at process exit time).
>
> btw., this also allows mostly-lockless fd allocation, which would
> probably benefit threaded apps too. (we can just recycle it from a
> per-CPU list of cached fds for that process)
See also:
http://lkml.org/lkml/2006/6/16/144
which originates from a much simpler patch I did to fix performance
regressions in this area for the SLES10 kernel.
--
Jens Axboe
next prev parent reply other threads:[~2007-05-31 9:36 UTC|newest]
Thread overview: 71+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-05-29 21:27 Syslets, Threadlets, generic AIO support, v6 Zach Brown
2007-05-29 21:49 ` Linus Torvalds
2007-05-29 22:49 ` Zach Brown
2007-05-29 22:16 ` Jeff Garzik
2007-05-29 23:09 ` Zach Brown
2007-05-29 23:20 ` Ulrich Drepper
2007-05-30 1:11 ` Dave Jones
2007-05-30 17:08 ` Zach Brown
2007-05-30 7:26 ` Ingo Molnar
2007-05-30 7:20 ` Ingo Molnar
2007-05-30 7:31 ` Ulrich Drepper
2007-05-30 8:42 ` Ingo Molnar
2007-05-30 8:51 ` Evgeniy Polyakov
2007-05-30 9:05 ` Ingo Molnar
2007-05-30 15:16 ` Linus Torvalds
2007-05-30 15:39 ` Ulrich Drepper
2007-05-30 19:40 ` Davide Libenzi
2007-05-30 19:55 ` Ulrich Drepper
2007-05-30 20:00 ` Linus Torvalds
2007-05-30 20:21 ` Davide Libenzi
2007-05-30 20:31 ` Eric Dumazet
2007-05-30 20:44 ` Linus Torvalds
2007-05-30 21:53 ` Eric Dumazet
2007-05-30 21:31 ` Davide Libenzi
2007-05-30 21:16 ` Ulrich Drepper
2007-05-30 21:27 ` Linus Torvalds
2007-05-30 21:47 ` Ulrich Drepper
2007-05-30 22:06 ` Davide Libenzi
2007-05-30 21:48 ` Davide Libenzi
2007-05-30 22:01 ` Linus Torvalds
2007-05-31 6:13 ` Ingo Molnar
2007-05-31 7:35 ` Eric Dumazet
2007-05-31 9:26 ` Ingo Molnar
2007-05-31 9:02 ` Ingo Molnar
2007-05-31 10:41 ` Eric Dumazet
2007-05-31 10:50 ` Ingo Molnar
2007-05-31 9:32 ` Ingo Molnar
2007-05-31 9:34 ` Jens Axboe [this message]
2007-05-30 22:09 ` Eric Dumazet
2007-05-30 21:51 ` David M. Lloyd
2007-05-30 22:24 ` William Lee Irwin III
2007-05-30 21:38 ` Jeremy Fitzhardinge
2007-05-30 21:39 ` Davide Libenzi
2007-05-30 21:36 ` Jeremy Fitzhardinge
2007-05-30 21:44 ` Linus Torvalds
2007-05-30 21:48 ` Linus Torvalds
2007-05-30 21:54 ` Jeremy Fitzhardinge
2007-05-30 22:27 ` Matt Mackall
2007-05-30 22:38 ` William Lee Irwin III
2007-05-30 8:32 ` Evgeniy Polyakov
2007-05-30 8:54 ` Ingo Molnar
2007-05-30 9:30 ` Evgeniy Polyakov
2007-05-30 9:28 ` Jeff Garzik
2007-05-30 13:02 ` Ingo Molnar
2007-05-30 13:20 ` Ingo Molnar
2007-05-30 15:31 ` Linus Torvalds
2007-05-30 16:09 ` Ingo Molnar
2007-05-30 17:57 ` Jens Axboe
2007-05-30 19:05 ` Mark Lord
2007-05-30 19:10 ` Jens Axboe
2007-05-30 19:15 ` Linus Torvalds
2007-05-30 19:32 ` Jens Axboe
2007-05-30 20:07 ` Eric Dumazet
2007-05-30 20:31 ` Linus Torvalds
2007-05-30 20:46 ` Eric Dumazet
2007-05-30 19:52 ` Davide Libenzi
2007-05-30 7:40 ` Jens Axboe
2007-05-30 16:55 ` Zach Brown
2007-05-30 17:33 ` Jens Axboe
-- strict thread matches above, loose matches on Subject: below --
2007-05-31 8:15 Albert Cahalan
2007-05-31 9:50 ` Ingo Molnar
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