From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
To: Nick Piggin <npiggin@suse.de>
Cc: linuxppc-dev@ozlabs.org, Paul Mackerras <paulus@samba.org>,
Anton Blanchard <anton@samba.org>
Subject: Re: [patch] powerpc: hash lock use lock bitops
Date: Tue, 20 Nov 2007 18:10:40 +1100 [thread overview]
Message-ID: <1195542640.6970.39.camel@pasglop> (raw)
In-Reply-To: <20071120062618.GB31514@wotan.suse.de>
On Tue, 2007-11-20 at 07:26 +0100, Nick Piggin wrote:
>
> BTW, here is another thing which you might want to think about. Again
> untested for temporary lack of hardware.
>
> --
>
> The radix-tree is now RCU safe, so powerpc can avoid the games it was playing
> in order to have a lockless readside. Saves an irq disable/enable, a couple of
> __get_cpu_var()s, a cacheline, and a memory barrier, in the fastpath. Should
> save a cycle or two...
Yup, I know. I need to work on that for -rt anyway due to other issues...
Thanks !
Ben.
next prev parent reply other threads:[~2007-11-20 7:10 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-11-20 5:08 [patch] xmon bitlock fix Nick Piggin
2007-11-20 5:09 ` [patch] powerpc: hash lock use lock bitops Nick Piggin
2007-11-20 6:08 ` Benjamin Herrenschmidt
2007-11-20 6:26 ` Nick Piggin
2007-11-20 7:10 ` Benjamin Herrenschmidt [this message]
2007-11-20 5:28 ` [patch] xmon bitlock fix Paul Mackerras
2007-11-20 6:03 ` Nick Piggin
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=1195542640.6970.39.camel@pasglop \
--to=benh@kernel.crashing.org \
--cc=anton@samba.org \
--cc=linuxppc-dev@ozlabs.org \
--cc=npiggin@suse.de \
--cc=paulus@samba.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.