From: Nick Piggin <nickpiggin@yahoo.com.au>
To: Andi Kleen <ak@suse.de>
Cc: linux-arch@vger.kernel.org, Linus Torvalds <torvalds@osdl.org>,
Andrew Morton <akpm@osdl.org>
Subject: Re: [patch] make spin_lock_prefetch a noop for UP
Date: Thu, 04 Aug 2005 23:37:09 +1000 [thread overview]
Message-ID: <42F21A05.1050102@yahoo.com.au> (raw)
In-Reply-To: <20050804132539.GU8266@wotan.suse.de>
Andi Kleen wrote:
>>From include/linux/prefetch.h:
>>
>>"spin_lock_prefetch(x) - prefectches the spinlock *x for taking"
>>
>>So this would reduce icache footprint and possibly memory
>>traffic on UP where taking a spinlock is a noop.
>
>
> Ah you want to disable it on UP?
> Ok that makes more sense. Why didn't you just say that? :)
>
Well I did, in a confusing kind of way ;) ... with the alternative
input stuff being used here, "noop" becomes ambiguous I guess.
> Anyways, even on UP it might be useful on all these mutex or whatever
> lock is envogue these days preemptive kernels.
>
I'm sure it would be useful. Though it is something that could be
maintained out of tree.
--
SUSE Labs, Novell Inc.
Send instant messages to your online friends http://au.messenger.yahoo.com
prev parent reply other threads:[~2005-08-04 13:37 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-08-04 13:07 [patch] make spin_lock_prefetch a noop for UP Nick Piggin
2005-08-04 13:10 ` Andi Kleen
2005-08-04 13:16 ` Nick Piggin
2005-08-04 13:25 ` Andi Kleen
2005-08-04 13:37 ` Nick Piggin [this message]
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=42F21A05.1050102@yahoo.com.au \
--to=nickpiggin@yahoo.com.au \
--cc=ak@suse.de \
--cc=akpm@osdl.org \
--cc=linux-arch@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 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.