From: Andi Kleen <ak@suse.de>
To: rohitseth@google.com
Cc: Chuck Ebbert <76306.1226@compuserve.com>,
Linus Torvalds <torvalds@osdl.org>, Ingo Molnar <mingo@elte.hu>,
linux-kernel@vger.kernel.org
Subject: Re: [RFC, patch] i386: vgetcpu(), take 2
Date: Thu, 22 Jun 2006 00:21:21 +0200 [thread overview]
Message-ID: <200606220021.21657.ak@suse.de> (raw)
In-Reply-To: <1150926882.6885.32.camel@galaxy.corp.google.com>
> Can we use similar mechanism to access pda in vsyscall in x86_64 (by
> storing the address of pda there).
You mean in the kernel? %gs prefix is a lot faster than this.
Also the limit is only 20bit, not enough for a full address.
For user space it's useful though, but I don't see any immediate uses
other than cpu number and node number. For most purposes glibc TLS
(which uses %fs) is probably sufficient.
-Andi
next prev parent reply other threads:[~2006-06-21 22:21 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-06-21 7:27 [RFC, patch] i386: vgetcpu(), take 2 Chuck Ebbert
2006-06-21 8:15 ` Ingo Molnar
2006-06-21 17:38 ` Artur Skawina
2006-06-28 5:44 ` Paul Jackson
2006-06-28 8:53 ` Andi Kleen
2006-06-28 9:00 ` Ingo Molnar
2006-06-29 8:47 ` Paul Jackson
2006-06-21 9:26 ` Andi Kleen
2006-06-21 9:35 ` Ingo Molnar
2006-06-21 21:54 ` Rohit Seth
2006-06-21 22:21 ` Andi Kleen [this message]
2006-06-21 22:59 ` Rohit Seth
2006-06-21 23:05 ` Andi Kleen
2006-06-21 23:18 ` Rohit Seth
2006-06-21 23:29 ` Andi Kleen
2006-06-22 0:55 ` Rohit Seth
2006-06-22 8:08 ` Andi Kleen
2006-06-22 21:06 ` Rohit Seth
2006-06-22 22:14 ` Andi Kleen
2006-06-22 23:10 ` Rohit Seth
2006-06-23 12:42 ` [discuss] " Andi Kleen
2006-06-24 2:06 ` Rohit Seth
2006-06-24 8:42 ` Andi Kleen
2006-06-27 1:13 ` Rohit Seth
-- strict thread matches above, loose matches on Subject: below --
2006-06-21 12:24 Chuck Ebbert
2006-06-21 17:14 ` Andi Kleen
2006-06-21 17:27 ` Linus Torvalds
2006-06-21 17:50 ` Andi Kleen
2006-06-22 12:23 Chuck Ebbert
2006-06-22 12:44 ` Andi Kleen
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