From: Andi Kleen <ak@suse.de>
To: Chuck Ebbert <76306.1226@compuserve.com>
Cc: linux-kernel <linux-kernel@vger.kernel.org>,
Linus Torvalds <torvalds@osdl.org>, Andrew Morton <akpm@osdl.org>
Subject: Re: [RFC, patch] i386: vgetcpu()
Date: Tue, 20 Jun 2006 22:57:16 +0200 [thread overview]
Message-ID: <200606202257.16033.ak@suse.de> (raw)
In-Reply-To: <200606201628_MC3-1-C2FA-3586@compuserve.com>
On Tuesday 20 June 2006 22:25, Chuck Ebbert wrote:
> Use the limit field of a GDT entry to store the current CPU
> number for fast userspace access. This still leaves 12 bits
> free for other information.
Nice trick. Maybe I'll even add that to the x86-64 implementation
if it's fast enough. Do you have numbers?
But it needs to be encapsulated in a wrapper I think. Just exposing
it to user space is the wrong way to do this.
-Andi
next prev parent reply other threads:[~2006-06-20 20:57 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-06-20 20:25 [RFC, patch] i386: vgetcpu() Chuck Ebbert
2006-06-20 20:57 ` Andi Kleen [this message]
-- strict thread matches above, loose matches on Subject: below --
2006-06-20 22:40 Chuck Ebbert
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