From: Waiman Long <waiman.long@hp.com>
To: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>, "H. Peter Anvin" <hpa@zytor.com>,
Arnd Bergmann <arnd@arndb.de>,
linux-arch@vger.kernel.org, x86@kernel.org,
linux-kernel@vger.kernel.org,
Steven Rostedt <rostedt@goodmis.org>,
Andrew Morton <akpm@linux-foundation.org>,
Michel Lespinasse <walken@google.com>,
Andi Kleen <andi@firstfloor.org>, Rik van Riel <riel@redhat.com>,
"Paul E. McKenney" <paulmck@linux.vnet.ibm.com>,
Linus Torvalds <torvalds@linux-foundation.org>,
Raghavendra K T <raghavendra.kt@linux.vnet.ibm.com>,
George Spelvin <linux@horizon.com>,
Tim Chen <tim.c.chen@linux.intel.com>,
Daniel J Blueman <daniel@numascale.com>,
Alexander Fyodorov <halcy@yandex.ru>,
Aswin Chandramouleeswaran <aswin@hp.com>,
Scott J Norton <scott.norton@hp.com>,
Thavatchai Makphaibulchoke <thavatchai.makpahibulchoke@hp.com>
Subject: Re: [PATCH v4 3/3] qspinlock, x86: Add x86 specific optimization for 2 contending tasks
Date: Fri, 21 Feb 2014 12:09:57 -0500 [thread overview]
Message-ID: <53078865.8060808@hp.com> (raw)
In-Reply-To: <530787F3.6020400@hp.com>
On 02/21/2014 12:08 PM, Waiman Long wrote:
> On 02/21/2014 07:12 AM, Peter Zijlstra wrote:
>>
>> Why is this x86 only code?
>
> The code is making use of the fact that byte write is atomic which is
> true in x86 and probably in a few other architectures. I could pull
> these codes into the generic qspinlock.c file and set a flag in the
> asm header file to activate it if it is what you want.
>
> -Longman
BTW, I also assume that 8-bit and 16-bit cmpxchg() and xchg() are available.
-Longman
next prev parent reply other threads:[~2014-02-21 17:10 UTC|newest]
Thread overview: 62+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-02-17 20:41 [PATCH v4 0/3] qspinlock: Introducing a 4-byte queue spinlock Waiman Long
2014-02-17 20:41 ` [PATCH v4 1/3] qspinlock: Introducing a 4-byte queue spinlock implementation Waiman Long
2014-02-17 22:45 ` [tip:x86/spinlocks] " tip-bot for Waiman Long
2014-02-18 7:30 ` [PATCH v4 1/3] " Peter Zijlstra
2014-02-18 19:29 ` Waiman Long
2014-02-18 7:33 ` Peter Zijlstra
2014-02-18 19:31 ` Waiman Long
2014-02-18 7:39 ` Peter Zijlstra
2014-02-18 19:39 ` Waiman Long
2014-02-18 21:34 ` Peter Zijlstra
2014-02-19 0:50 ` Waiman Long
2014-02-19 8:52 ` Peter Zijlstra
2014-02-19 19:26 ` Waiman Long
2014-02-18 21:37 ` Peter Zijlstra
2014-02-19 0:58 ` Waiman Long
2014-02-19 8:55 ` Peter Zijlstra
2014-02-19 19:30 ` Waiman Long
2014-02-17 20:41 ` [PATCH v4 2/3] qspinlock, x86: Enable x86-64 to use queue spinlock Waiman Long
2014-02-17 22:46 ` [tip:x86/spinlocks] " tip-bot for Waiman Long
2014-02-17 20:41 ` [PATCH v4 3/3] qspinlock, x86: Add x86 specific optimization for 2 contending tasks Waiman Long
2014-02-17 22:46 ` [tip:x86/spinlocks] " tip-bot for Waiman Long
2014-02-21 12:12 ` [PATCH v4 3/3] " Peter Zijlstra
2014-02-21 17:08 ` Waiman Long
2014-02-21 17:09 ` Waiman Long [this message]
2014-02-21 17:26 ` Peter Zijlstra
2014-02-22 1:36 ` Waiman Long
2014-02-21 17:28 ` Peter Zijlstra
2014-02-22 1:39 ` Waiman Long
2014-02-17 22:47 ` [PATCH v4 0/3] qspinlock: Introducing a 4-byte queue spinlock H. Peter Anvin
2014-02-18 7:31 ` Peter Zijlstra
2014-02-18 7:39 ` H. Peter Anvin
2014-02-18 19:30 ` Waiman Long
2014-02-18 21:28 ` Peter Zijlstra
2014-02-19 0:42 ` Waiman Long
2014-02-19 7:09 ` Raghavendra K T
2014-02-19 8:51 ` Peter Zijlstra
2014-02-19 19:24 ` Waiman Long
2014-02-19 19:48 ` Peter Zijlstra
2014-02-20 17:37 ` Waiman Long
2014-02-20 17:44 ` Linus Torvalds
2014-02-20 17:44 ` Linus Torvalds
2014-02-20 18:15 ` Peter Zijlstra
2014-02-19 20:17 ` Linus Torvalds
2014-02-19 20:17 ` Linus Torvalds
2014-02-20 17:54 ` Waiman Long
2014-02-20 17:54 ` Waiman Long
2014-02-20 18:42 ` Linus Torvalds
2014-02-20 18:42 ` Linus Torvalds
2014-02-20 19:21 ` Waiman Long
2014-02-20 19:21 ` Waiman Long
2014-02-20 19:32 ` Raghavendra K T
2014-02-20 19:32 ` Raghavendra K T
2014-02-21 17:02 ` Waiman Long
2014-02-21 17:02 ` Waiman Long
2014-02-21 17:05 ` Linus Torvalds
2014-02-21 17:05 ` Linus Torvalds
2014-02-19 21:29 ` H. Peter Anvin
2014-02-18 7:38 ` Peter Zijlstra
2014-02-22 16:56 ` Ingo Molnar
2014-02-25 3:37 ` Waiman Long
2014-02-25 3:37 ` Waiman Long
2014-02-18 19:27 ` Waiman Long
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=53078865.8060808@hp.com \
--to=waiman.long@hp.com \
--cc=akpm@linux-foundation.org \
--cc=andi@firstfloor.org \
--cc=arnd@arndb.de \
--cc=aswin@hp.com \
--cc=daniel@numascale.com \
--cc=halcy@yandex.ru \
--cc=hpa@zytor.com \
--cc=linux-arch@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux@horizon.com \
--cc=mingo@redhat.com \
--cc=paulmck@linux.vnet.ibm.com \
--cc=peterz@infradead.org \
--cc=raghavendra.kt@linux.vnet.ibm.com \
--cc=riel@redhat.com \
--cc=rostedt@goodmis.org \
--cc=scott.norton@hp.com \
--cc=tglx@linutronix.de \
--cc=thavatchai.makpahibulchoke@hp.com \
--cc=tim.c.chen@linux.intel.com \
--cc=torvalds@linux-foundation.org \
--cc=walken@google.com \
--cc=x86@kernel.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.