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
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=200606202257.16033.ak@suse.de \
--to=ak@suse.de \
--cc=76306.1226@compuserve.com \
--cc=akpm@osdl.org \
--cc=linux-kernel@vger.kernel.org \
--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 a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox