From: Zach Brown <zach.brown@oracle.com>
To: Benjamin LaHaise <bcrl@kvack.org>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>,
linux-kernel@vger.kernel.org, linux-aio@kvack.org,
Suparna Bhattacharya <suparna@in.ibm.com>,
Linus Torvalds <torvalds@linux-foundation.org>
Subject: Re: [PATCH 0 of 4] Generic AIO by scheduling stacks
Date: Wed, 31 Jan 2007 12:41:11 -0800 [thread overview]
Message-ID: <D9B3FCED-B132-4833-9CBF-39B06E551132@oracle.com> (raw)
In-Reply-To: <20070131200502.GO1344@kvack.org>
> Take FPU state: memory copies and RAID xor functions use MMX/SSE and
> require that the full task state be saved and restored.
Sure, that much is obvious. I was hoping to see what FPU state
juggling actually requires. I'm operating under the assumption that
it won't be *terrible*.
> Task priority is another. POSIX AIO lets you specify request
> priority, and
> it really is needed for realtime workloads where things like keepalive
> must be processed at a higher priority.
Yeah. A first-pass approximation might be to have threads with asys
system calls grouped by priority. Leaving all that priority handling
to the *task* scheduler, instead of the dirt-stupid fibril
"scheduler", would be great. If we can get away with it. I don't
have a good feeling for what portion of the world actually cares
about this, or to what degree.
- z
next prev parent reply other threads:[~2007-01-31 20:41 UTC|newest]
Thread overview: 151+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-01-30 20:39 [PATCH 0 of 4] Generic AIO by scheduling stacks Zach Brown
2007-01-30 20:39 ` [PATCH 1 of 4] Introduce per_call_chain() Zach Brown
2007-01-30 20:39 ` [PATCH 2 of 4] Introduce i386 fibril scheduling Zach Brown
2007-02-01 8:36 ` Ingo Molnar
2007-02-01 13:02 ` Ingo Molnar
2007-02-01 13:19 ` Christoph Hellwig
2007-02-01 13:52 ` Ingo Molnar
2007-02-01 17:13 ` Mark Lord
2007-02-01 18:02 ` Ingo Molnar
2007-02-02 13:23 ` Andi Kleen
2007-02-01 21:52 ` Zach Brown
2007-02-01 22:23 ` Benjamin LaHaise
2007-02-01 22:37 ` Zach Brown
2007-02-02 13:22 ` Andi Kleen
2007-02-01 20:07 ` Linus Torvalds
2007-02-02 10:49 ` Ingo Molnar
2007-02-02 15:56 ` Linus Torvalds
2007-02-02 19:59 ` Alan
2007-02-02 20:14 ` Linus Torvalds
2007-02-02 20:58 ` Davide Libenzi
2007-02-02 21:09 ` Linus Torvalds
2007-02-02 21:30 ` Alan
2007-02-02 21:30 ` Linus Torvalds
2007-02-02 22:42 ` Ingo Molnar
2007-02-02 23:01 ` Linus Torvalds
2007-02-02 23:17 ` Linus Torvalds
2007-02-03 0:04 ` Alan
2007-02-03 0:23 ` bert hubert
2007-02-02 22:48 ` Alan
2007-02-05 16:44 ` Zach Brown
2007-02-02 22:21 ` Ingo Molnar
2007-02-02 22:49 ` Linus Torvalds
2007-02-02 23:55 ` Ingo Molnar
2007-02-03 0:56 ` Linus Torvalds
2007-02-03 7:15 ` Suparna Bhattacharya
2007-02-03 8:23 ` Ingo Molnar
2007-02-03 9:25 ` Matt Mackall
2007-02-03 10:03 ` Ingo Molnar
2007-02-05 17:44 ` Zach Brown
2007-02-05 19:26 ` Davide Libenzi
2007-02-05 19:41 ` Zach Brown
2007-02-05 20:10 ` Davide Libenzi
2007-02-05 20:21 ` Zach Brown
2007-02-05 20:42 ` Linus Torvalds
2007-02-05 20:39 ` Linus Torvalds
2007-02-05 21:09 ` Davide Libenzi
2007-02-05 21:31 ` Kent Overstreet
2007-02-06 20:25 ` Davide Libenzi
2007-02-06 20:46 ` Linus Torvalds
2007-02-06 21:16 ` David Miller
2007-02-06 21:28 ` Linus Torvalds
2007-02-06 21:31 ` David Miller
2007-02-06 21:46 ` Eric Dumazet
2007-02-06 21:50 ` Linus Torvalds
2007-02-06 22:28 ` Zach Brown
2007-02-06 22:45 ` Kent Overstreet
2007-02-06 23:04 ` Linus Torvalds
2007-02-07 1:22 ` Kent Overstreet
2007-02-06 23:23 ` Davide Libenzi
2007-02-06 23:39 ` Joel Becker
2007-02-06 23:56 ` Davide Libenzi
2007-02-07 0:06 ` Joel Becker
2007-02-07 0:23 ` Davide Libenzi
2007-02-07 0:44 ` Joel Becker
2007-02-07 1:15 ` Davide Libenzi
2007-02-07 1:24 ` Kent Overstreet
2007-02-07 1:30 ` Joel Becker
2007-02-07 6:16 ` Michael K. Edwards
2007-02-07 9:17 ` Michael K. Edwards
2007-02-07 9:37 ` Michael K. Edwards
2007-02-06 0:32 ` Davide Libenzi
2007-02-05 21:21 ` Zach Brown
2007-02-02 23:37 ` Davide Libenzi
2007-02-03 0:02 ` Davide Libenzi
2007-02-05 17:12 ` Zach Brown
2007-02-05 18:24 ` Davide Libenzi
2007-02-05 21:44 ` David Miller
2007-02-06 0:15 ` Davide Libenzi
2007-02-05 21:36 ` bert hubert
2007-02-05 21:57 ` Linus Torvalds
2007-02-05 22:07 ` bert hubert
2007-02-05 22:15 ` Zach Brown
2007-02-05 22:34 ` Davide Libenzi
2007-02-06 0:27 ` Scot McKinley
2007-02-06 0:48 ` David Miller
2007-02-06 0:48 ` Joel Becker
2007-02-05 17:02 ` Zach Brown
2007-02-05 18:52 ` Davide Libenzi
2007-02-05 19:20 ` Zach Brown
2007-02-05 19:38 ` Davide Libenzi
2007-02-04 5:12 ` Davide Libenzi
2007-02-05 17:54 ` Zach Brown
2007-01-30 20:39 ` [PATCH 3 of 4] Teach paths to wake a specific void * target instead of a whole task_struct Zach Brown
2007-01-30 20:39 ` [PATCH 4 of 4] Introduce aio system call submission and completion system calls Zach Brown
2007-01-31 8:58 ` Andi Kleen
2007-01-31 17:15 ` Zach Brown
2007-01-31 17:21 ` Andi Kleen
2007-01-31 19:23 ` Zach Brown
2007-02-01 11:13 ` Suparna Bhattacharya
2007-02-01 19:50 ` Trond Myklebust
2007-02-02 7:19 ` Suparna Bhattacharya
2007-02-02 7:45 ` Andi Kleen
2007-02-01 22:18 ` Zach Brown
2007-02-02 3:35 ` Suparna Bhattacharya
2007-02-01 20:26 ` bert hubert
2007-02-01 21:29 ` Zach Brown
2007-02-02 7:12 ` bert hubert
2007-02-04 5:12 ` Davide Libenzi
2007-01-30 21:58 ` [PATCH 0 of 4] Generic AIO by scheduling stacks Linus Torvalds
2007-01-30 22:23 ` Linus Torvalds
2007-01-30 22:53 ` Zach Brown
2007-01-30 22:40 ` Zach Brown
2007-01-30 22:53 ` Linus Torvalds
2007-01-30 23:45 ` Zach Brown
2007-01-31 2:07 ` Benjamin Herrenschmidt
2007-01-31 2:04 ` Benjamin Herrenschmidt
2007-01-31 2:46 ` Linus Torvalds
2007-01-31 3:02 ` Linus Torvalds
2007-01-31 10:50 ` Xavier Bestel
2007-01-31 19:28 ` Zach Brown
2007-01-31 17:59 ` Zach Brown
2007-01-31 5:16 ` Benjamin Herrenschmidt
2007-01-31 5:36 ` Nick Piggin
2007-01-31 5:51 ` Nick Piggin
2007-01-31 6:06 ` Linus Torvalds
2007-01-31 8:43 ` Ingo Molnar
2007-01-31 20:13 ` Joel Becker
2007-01-31 18:20 ` Zach Brown
2007-01-31 17:47 ` Zach Brown
2007-01-31 17:38 ` Zach Brown
2007-01-31 17:51 ` Benjamin LaHaise
2007-01-31 19:25 ` Zach Brown
2007-01-31 20:05 ` Benjamin LaHaise
2007-01-31 20:41 ` Zach Brown [this message]
2007-02-04 5:13 ` Davide Libenzi
2007-02-04 20:00 ` Davide Libenzi
2007-02-09 22:33 ` Linus Torvalds
2007-02-09 23:11 ` Davide Libenzi
2007-02-09 23:35 ` Linus Torvalds
2007-02-10 18:45 ` Davide Libenzi
2007-02-10 19:01 ` Linus Torvalds
2007-02-10 19:35 ` Linus Torvalds
2007-02-10 20:59 ` Davide Libenzi
2007-02-10 0:04 ` Eric Dumazet
2007-02-10 0:12 ` Linus Torvalds
2007-02-10 0:34 ` Alan
2007-02-10 10:47 ` bert hubert
2007-02-10 18:19 ` Davide Libenzi
2007-02-11 0:56 ` David Miller
2007-02-11 2:49 ` Linus Torvalds
2007-02-14 16:42 ` James Antill
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