From: Tejun Heo <tj@kernel.org>
To: Shaohua Li <shaohua.li@intel.com>,
Sam Ravnborg <sam@ravnborg.org>,
lkml <linux-kernel@vger.kernel.org>,
"hpa@zytor.com" <hpa@zytor.com>,
Andrew Morton <akpm@linux-foundation.org>,
eric.dumazet@gmail.com, linux-arch@vger.kernel.org
Subject: Re: [PATCH RESEND percpu#for-next] percpu: align percpu readmostly subsection to cacheline
Date: Tue, 25 Jan 2011 14:32:13 +0100 [thread overview]
Message-ID: <20110125133213.GV27510@htj.dyndns.org> (raw)
In-Reply-To: <20101227133719.GD488@htj.dyndns.org>
On Mon, Dec 27, 2010 at 02:37:19PM +0100, Tejun Heo wrote:
> Currently percpu readmostly subsection may share cachelines with other
> percpu subsections which may result in unnecessary cacheline bounce
> and performance degradation.
>
> This patch adds @cacheline parameter to PERCPU() and PERCPU_VADDR()
> linker macros, makes each arch linker scripts specify its cacheline
> size and use it to align percpu subsections.
>
> This is based on Shaohua's x86 only patch.
>
> Signed-off-by: Tejun Heo <tj@kernel.org>
> Cc: Shaohua Li <shaohua.li@intel.com>
> ---
> Shaohua, can you please verify this achieves the same result? If no
> one objects, I'll route it through the percpu tree.
Applied to percpu#for-2.6.39.
Thanks.
--
tejun
prev parent reply other threads:[~2011-01-25 13:32 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-12-27 13:37 Tejun Heo
2010-12-27 20:17 ` H. Peter Anvin
2010-12-27 20:43 ` Sam Ravnborg
2010-12-27 21:03 ` H. Peter Anvin
2010-12-28 11:18 ` Tejun Heo
2010-12-28 11:33 ` [PATCH] alpha: use L1_CACHE_BYTES for cacheline size in the linker script Tejun Heo
2011-01-25 13:28 ` Tejun Heo
2010-12-28 0:48 ` [PATCH RESEND percpu#for-next] percpu: align percpu readmostly subsection to cacheline Shaohua Li
2011-01-25 13:32 ` Tejun Heo [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=20110125133213.GV27510@htj.dyndns.org \
--to=tj@kernel.org \
--cc=akpm@linux-foundation.org \
--cc=eric.dumazet@gmail.com \
--cc=hpa@zytor.com \
--cc=linux-arch@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=sam@ravnborg.org \
--cc=shaohua.li@intel.com \
/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
all inboxes | Powered by JetHome®