From: Nick Piggin <nickpiggin@yahoo.com.au>
To: Jens Axboe <axboe@suse.de>
Cc: Andrew Morton <akpm@osdl.org>,
torvalds@osdl.org, linux-kernel@vger.kernel.org, npiggin@suse.de,
linux-mm@kvack.org
Subject: Re: Lockless page cache test results
Date: Thu, 27 Apr 2006 17:57:30 +1000 [thread overview]
Message-ID: <4450796A.2030908@yahoo.com.au> (raw)
In-Reply-To: <20060427074533.GJ9211@suse.de>
Jens Axboe wrote:
> Things look pretty bad for the lockless kernel though, Nick any idea
> what is going on there? The splice change is pretty simple, see the top
> three patches here:
Could just be the use of spin lock instead of read lock.
I don't think it would be hard to convert find_get_pages_contig
to be lockless.
Patched vanilla numbers look nicer, but I'm curious as to why
__do_page_cache was so bad before, if the file was in cache.
Presumably it should not more than double tree_lock acquisition...
it isn't getting called multiple times for each page, is it?
--
SUSE Labs, Novell Inc.
Send instant messages to your online friends http://au.messenger.yahoo.com
WARNING: multiple messages have this Message-ID (diff)
From: Nick Piggin <nickpiggin@yahoo.com.au>
To: Jens Axboe <axboe@suse.de>
Cc: Andrew Morton <akpm@osdl.org>,
torvalds@osdl.org, linux-kernel@vger.kernel.org, npiggin@suse.de,
linux-mm@kvack.org
Subject: Re: Lockless page cache test results
Date: Thu, 27 Apr 2006 17:57:30 +1000 [thread overview]
Message-ID: <4450796A.2030908@yahoo.com.au> (raw)
In-Reply-To: <20060427074533.GJ9211@suse.de>
Jens Axboe wrote:
> Things look pretty bad for the lockless kernel though, Nick any idea
> what is going on there? The splice change is pretty simple, see the top
> three patches here:
Could just be the use of spin lock instead of read lock.
I don't think it would be hard to convert find_get_pages_contig
to be lockless.
Patched vanilla numbers look nicer, but I'm curious as to why
__do_page_cache was so bad before, if the file was in cache.
Presumably it should not more than double tree_lock acquisition...
it isn't getting called multiple times for each page, is it?
--
SUSE Labs, Novell Inc.
Send instant messages to your online friends http://au.messenger.yahoo.com
--
To unsubscribe, send a message with 'unsubscribe linux-mm' in
the body to majordomo@kvack.org. For more info on Linux MM,
see: http://www.linux-mm.org/ .
Don't email: <a href=mailto:"dont@kvack.org"> email@kvack.org </a>
next prev parent reply other threads:[~2006-04-27 8:29 UTC|newest]
Thread overview: 99+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-04-26 13:53 Lockless page cache test results Jens Axboe
2006-04-26 14:43 ` Nick Piggin
2006-04-26 14:43 ` Nick Piggin
2006-04-26 19:46 ` Jens Axboe
2006-04-26 19:46 ` Jens Axboe
2006-04-27 5:39 ` Chen, Kenneth W
2006-04-27 5:39 ` Chen, Kenneth W
2006-04-27 6:07 ` Nick Piggin
2006-04-27 6:07 ` Nick Piggin
2006-04-27 6:15 ` Andi Kleen
2006-04-27 6:15 ` Andi Kleen
2006-04-27 7:51 ` Chen, Kenneth W
2006-04-27 7:51 ` Chen, Kenneth W
2006-04-26 16:55 ` Andrew Morton
2006-04-26 16:55 ` Andrew Morton
2006-04-26 17:42 ` Jens Axboe
2006-04-26 17:42 ` Jens Axboe
2006-04-26 18:10 ` Andrew Morton
2006-04-26 18:10 ` Andrew Morton
2006-04-26 18:23 ` Jens Axboe
2006-04-26 18:23 ` Jens Axboe
2006-04-26 18:46 ` Andrew Morton
2006-04-26 18:46 ` Andrew Morton
2006-04-26 19:21 ` Jens Axboe
2006-04-26 19:21 ` Jens Axboe
2006-04-27 5:58 ` Nick Piggin
2006-04-27 5:58 ` Nick Piggin
2006-04-26 18:34 ` Christoph Lameter
2006-04-26 18:34 ` Christoph Lameter
2006-04-26 18:47 ` Andrew Morton
2006-04-26 18:47 ` Andrew Morton
2006-04-26 18:48 ` Christoph Lameter
2006-04-26 18:48 ` Christoph Lameter
2006-04-26 18:49 ` Jens Axboe
2006-04-26 18:49 ` Jens Axboe
2006-04-26 20:31 ` Christoph Lameter
2006-04-26 20:31 ` Christoph Lameter
2006-04-28 14:01 ` David Chinner
2006-04-28 14:01 ` David Chinner
2006-04-28 14:10 ` David Chinner
2006-04-28 14:10 ` David Chinner
2006-04-30 9:49 ` Nick Piggin
2006-04-30 11:20 ` Nick Piggin
2006-04-30 11:20 ` Nick Piggin
2006-04-30 11:39 ` Jens Axboe
2006-04-30 11:39 ` Jens Axboe
2006-04-30 11:44 ` Nick Piggin
2006-04-26 18:58 ` Christoph Hellwig
2006-04-26 18:58 ` Christoph Hellwig
2006-04-26 19:02 ` Jens Axboe
2006-04-26 19:02 ` Jens Axboe
2006-04-26 19:00 ` Linus Torvalds
2006-04-26 19:00 ` Linus Torvalds
2006-04-26 19:15 ` Jens Axboe
2006-04-26 19:15 ` Jens Axboe
2006-04-26 20:12 ` Andrew Morton
2006-04-26 20:12 ` Andrew Morton
2006-04-27 7:45 ` Jens Axboe
2006-04-27 7:47 ` Jens Axboe
2006-04-27 7:47 ` Jens Axboe
2006-04-27 7:57 ` Nick Piggin [this message]
2006-04-27 7:57 ` Nick Piggin
2006-04-27 8:02 ` Nick Piggin
2006-04-27 8:02 ` Nick Piggin
2006-04-27 9:00 ` Jens Axboe
2006-04-27 9:00 ` Jens Axboe
2006-04-27 13:36 ` Nick Piggin
2006-04-27 13:36 ` Nick Piggin
2006-04-27 8:36 ` Jens Axboe
2006-04-27 8:36 ` Jens Axboe
2006-04-28 11:28 ` Wu Fengguang
2006-04-28 11:28 ` Wu Fengguang
2006-04-28 11:28 ` Wu Fengguang
2006-04-27 5:49 ` Nick Piggin
2006-04-27 5:49 ` Nick Piggin
2006-04-27 15:12 ` Linus Torvalds
2006-04-27 15:12 ` Linus Torvalds
2006-04-28 4:54 ` Nick Piggin
2006-04-28 4:54 ` Nick Piggin
2006-04-28 5:34 ` Linus Torvalds
2006-04-28 5:34 ` Linus Torvalds
2006-04-27 9:35 ` Jens Axboe
2006-04-27 5:22 ` Nick Piggin
2006-04-27 5:22 ` Nick Piggin
2006-04-26 18:57 ` Jens Axboe
2006-04-27 2:19 ` KAMEZAWA Hiroyuki
2006-04-27 2:19 ` KAMEZAWA Hiroyuki
2006-04-27 8:03 ` Jens Axboe
2006-04-27 8:03 ` Jens Axboe
2006-04-27 11:16 ` Jens Axboe
2006-04-27 11:16 ` Jens Axboe
2006-04-27 11:41 ` KAMEZAWA Hiroyuki
2006-04-27 11:41 ` KAMEZAWA Hiroyuki
2006-04-27 11:45 ` Jens Axboe
2006-04-27 11:45 ` Jens Axboe
2006-04-28 9:10 ` Pavel Machek
2006-04-28 9:10 ` Pavel Machek
2006-04-28 9:21 ` Jens Axboe
2006-04-28 9:21 ` Jens Axboe
-- strict thread matches above, loose matches on Subject: below --
2006-04-28 16:58 Al Boldi
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=4450796A.2030908@yahoo.com.au \
--to=nickpiggin@yahoo.com.au \
--cc=akpm@osdl.org \
--cc=axboe@suse.de \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-mm@kvack.org \
--cc=npiggin@suse.de \
--cc=torvalds@osdl.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.