From: Paolo Bonzini <pbonzini@redhat.com>
To: Peter Zijlstra <a.p.zijlstra@chello.nl>,
Waiman.Long@hp.com, tglx@linutronix.de, mingo@kernel.org
Cc: linux-arch@vger.kernel.org, riel@redhat.com, gleb@redhat.com,
kvm@vger.kernel.org, konrad.wilk@oracle.com,
Peter Zijlstra <peterz@infradead.org>,
scott.norton@hp.com, raghavendra.kt@linux.vnet.ibm.com,
paolo.bonzini@gmail.com, linux-kernel@vger.kernel.org,
virtualization@lists.linux-foundation.org, chegu_vinod@hp.com,
david.vrabel@citrix.com, oleg@redhat.com,
xen-devel@lists.xenproject.org, boris.ostrovsky@oracle.com,
paulmck@linux.vnet.ibm.com, torvalds@linux-foundation.org
Subject: Re: [PATCH 06/11] qspinlock: Optimize pending bit
Date: Wed, 18 Jun 2014 13:42:13 +0200 [thread overview]
Message-ID: <53A17B15.3080904@redhat.com> (raw)
In-Reply-To: <20140615130153.638054585@chello.nl>
Il 15/06/2014 14:47, Peter Zijlstra ha scritto:
> XXX: merge into the pending bit patch..
Agree, or if not move it right after the pending bit patch, before the
NR_CPUS optimization.
Paolo
> It is possible so observe the pending bit without the locked bit when
> the last owner has just released but the pending owner has not yet
> taken ownership.
>
> In this case we would normally queue -- because the pending bit is
> already taken. However, in this case the pending bit is guaranteed to
> be released 'soon', therefore wait for it and avoid queueing.
>
> Signed-off-by: Peter Zijlstra <peterz@infradead.org>
WARNING: multiple messages have this Message-ID (diff)
From: Paolo Bonzini <pbonzini@redhat.com>
To: Peter Zijlstra <a.p.zijlstra@chello.nl>,
Waiman.Long@hp.com, tglx@linutronix.de, mingo@kernel.org
Cc: linux-arch@vger.kernel.org, linux-kernel@vger.kernel.org,
virtualization@lists.linux-foundation.org,
xen-devel@lists.xenproject.org, kvm@vger.kernel.org,
paolo.bonzini@gmail.com, konrad.wilk@oracle.com,
boris.ostrovsky@oracle.com, paulmck@linux.vnet.ibm.com,
riel@redhat.com, torvalds@linux-foundation.org,
raghavendra.kt@linux.vnet.ibm.com, david.vrabel@citrix.com,
oleg@redhat.com, gleb@redhat.com, scott.norton@hp.com,
chegu_vinod@hp.com, Peter Zijlstra <peterz@infradead.org>
Subject: Re: [PATCH 06/11] qspinlock: Optimize pending bit
Date: Wed, 18 Jun 2014 13:42:13 +0200 [thread overview]
Message-ID: <53A17B15.3080904@redhat.com> (raw)
Message-ID: <20140618114213.OEce3NIRfIiJWrzZMmXdYvgOnn_API6pvkatvVOTCo0@z> (raw)
In-Reply-To: <20140615130153.638054585@chello.nl>
Il 15/06/2014 14:47, Peter Zijlstra ha scritto:
> XXX: merge into the pending bit patch..
Agree, or if not move it right after the pending bit patch, before the
NR_CPUS optimization.
Paolo
> It is possible so observe the pending bit without the locked bit when
> the last owner has just released but the pending owner has not yet
> taken ownership.
>
> In this case we would normally queue -- because the pending bit is
> already taken. However, in this case the pending bit is guaranteed to
> be released 'soon', therefore wait for it and avoid queueing.
>
> Signed-off-by: Peter Zijlstra <peterz@infradead.org>
next prev parent reply other threads:[~2014-06-18 11:42 UTC|newest]
Thread overview: 120+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-06-15 12:46 [PATCH 00/11] qspinlock with paravirt support Peter Zijlstra
2014-06-15 12:46 ` Peter Zijlstra
2014-06-15 12:46 ` [PATCH 01/11] qspinlock: A simple generic 4-byte queue spinlock Peter Zijlstra
2014-06-15 12:46 ` Peter Zijlstra
2014-06-16 20:49 ` Konrad Rzeszutek Wilk
2014-06-16 20:49 ` Konrad Rzeszutek Wilk
2014-06-17 20:03 ` Konrad Rzeszutek Wilk
2014-06-17 20:03 ` Konrad Rzeszutek Wilk
2014-06-23 16:12 ` Peter Zijlstra
2014-06-23 16:12 ` Peter Zijlstra
2014-06-23 16:20 ` Konrad Rzeszutek Wilk
2014-06-23 16:20 ` Konrad Rzeszutek Wilk
2014-06-23 15:56 ` Peter Zijlstra
2014-06-23 16:16 ` Konrad Rzeszutek Wilk
2014-06-23 16:16 ` Konrad Rzeszutek Wilk
2014-06-17 20:05 ` Konrad Rzeszutek Wilk
2014-06-17 20:05 ` Konrad Rzeszutek Wilk
2014-06-23 16:26 ` Peter Zijlstra
2014-06-23 16:26 ` Peter Zijlstra
2014-06-23 16:45 ` Konrad Rzeszutek Wilk
2014-06-23 16:45 ` Konrad Rzeszutek Wilk
2014-06-15 12:46 ` [PATCH 02/11] qspinlock, x86: Enable x86-64 to use " Peter Zijlstra
2014-06-15 12:46 ` Peter Zijlstra
2014-06-15 12:47 ` [PATCH 03/11] qspinlock: Add pending bit Peter Zijlstra
2014-06-15 12:47 ` Peter Zijlstra
2014-06-17 20:36 ` Konrad Rzeszutek Wilk
2014-06-17 20:36 ` Konrad Rzeszutek Wilk
2014-06-17 20:51 ` Waiman Long
2014-06-17 20:51 ` Waiman Long
2014-06-17 21:07 ` Konrad Rzeszutek Wilk
2014-06-17 21:07 ` Konrad Rzeszutek Wilk
2014-06-17 21:10 ` Konrad Rzeszutek Wilk
2014-06-17 21:10 ` Konrad Rzeszutek Wilk
2014-06-17 22:25 ` Waiman Long
2014-06-17 22:25 ` Waiman Long
2014-06-24 8:24 ` Peter Zijlstra
2014-06-24 8:24 ` Peter Zijlstra
2014-06-18 11:29 ` Paolo Bonzini
2014-06-18 11:29 ` Paolo Bonzini
2014-06-18 13:36 ` Konrad Rzeszutek Wilk
2014-06-18 13:36 ` Konrad Rzeszutek Wilk
2014-06-23 16:35 ` Peter Zijlstra
2014-06-23 16:35 ` Peter Zijlstra
2014-06-15 12:47 ` [PATCH 04/11] qspinlock: Extract out the exchange of tail code word Peter Zijlstra
2014-06-17 20:55 ` Konrad Rzeszutek Wilk
2014-06-17 20:55 ` Konrad Rzeszutek Wilk
2014-06-18 11:37 ` Paolo Bonzini
2014-06-18 11:37 ` Paolo Bonzini
2014-06-18 13:50 ` Konrad Rzeszutek Wilk
2014-06-18 13:50 ` Konrad Rzeszutek Wilk
2014-06-18 15:46 ` Waiman Long
2014-06-18 15:46 ` Waiman Long
2014-06-18 15:49 ` Paolo Bonzini
2014-06-18 15:49 ` Paolo Bonzini
2014-06-18 16:02 ` Konrad Rzeszutek Wilk
2014-06-18 16:02 ` Konrad Rzeszutek Wilk
2014-06-24 10:47 ` Peter Zijlstra
2014-06-24 10:47 ` Peter Zijlstra
2014-06-15 12:47 ` [PATCH 05/11] qspinlock: Optimize for smaller NR_CPUS Peter Zijlstra
2014-06-15 12:47 ` Peter Zijlstra
2014-06-18 11:39 ` Paolo Bonzini
2014-06-18 11:39 ` Paolo Bonzini
2014-07-07 14:35 ` Peter Zijlstra
2014-07-07 14:35 ` Peter Zijlstra
2014-07-07 15:08 ` Paolo Bonzini
2014-07-07 15:08 ` Paolo Bonzini
2014-07-07 15:35 ` Peter Zijlstra
2014-07-07 15:35 ` Peter Zijlstra
2014-07-07 16:10 ` Paolo Bonzini
2014-07-07 16:10 ` Paolo Bonzini
2014-06-18 15:57 ` Konrad Rzeszutek Wilk
2014-06-18 15:57 ` Konrad Rzeszutek Wilk
2014-07-07 14:33 ` Peter Zijlstra
2014-07-07 14:33 ` Peter Zijlstra
2014-06-15 12:47 ` [PATCH 06/11] qspinlock: Optimize pending bit Peter Zijlstra
2014-06-15 12:47 ` Peter Zijlstra
2014-06-18 11:42 ` Paolo Bonzini [this message]
2014-06-18 11:42 ` Paolo Bonzini
2014-06-15 12:47 ` [PATCH 07/11] qspinlock: Use a simple write to grab the lock, if applicable Peter Zijlstra
2014-06-15 12:47 ` Peter Zijlstra
2014-06-18 16:36 ` Konrad Rzeszutek Wilk
2014-06-18 16:36 ` Konrad Rzeszutek Wilk
2014-07-07 14:51 ` Peter Zijlstra
2014-07-07 14:51 ` Peter Zijlstra
2014-06-15 12:47 ` [PATCH 08/11] qspinlock: Revert to test-and-set on hypervisors Peter Zijlstra
2014-06-15 12:47 ` Peter Zijlstra
2014-06-16 21:57 ` Waiman Long
2014-06-18 16:40 ` Konrad Rzeszutek Wilk
2014-06-18 16:40 ` Konrad Rzeszutek Wilk
2014-06-15 12:47 ` [PATCH 09/11] pvqspinlock, x86: Rename paravirt_ticketlocks_enabled Peter Zijlstra
2014-06-15 12:47 ` Peter Zijlstra
2014-06-18 16:43 ` Konrad Rzeszutek Wilk
2014-06-18 16:43 ` Konrad Rzeszutek Wilk
2014-06-15 12:47 ` [PATCH 10/11] qspinlock: Paravirt support Peter Zijlstra
2014-06-15 12:47 ` Peter Zijlstra
2014-06-16 22:08 ` Waiman Long
2014-06-18 12:03 ` Paolo Bonzini
2014-06-18 12:03 ` Paolo Bonzini
2014-06-18 15:26 ` Waiman Long
2014-06-18 15:26 ` Waiman Long
2014-07-07 15:20 ` Peter Zijlstra
2014-07-07 15:20 ` Peter Zijlstra
2014-07-07 15:20 ` Peter Zijlstra
2014-07-07 15:20 ` Peter Zijlstra
2014-06-17 0:53 ` Waiman Long
2014-06-17 0:53 ` Waiman Long
2014-06-18 12:04 ` Paolo Bonzini
2014-06-18 12:04 ` Paolo Bonzini
2014-06-20 13:46 ` Konrad Rzeszutek Wilk
2014-06-20 13:46 ` Konrad Rzeszutek Wilk
2014-07-07 15:27 ` Peter Zijlstra
2014-07-15 14:23 ` Konrad Rzeszutek Wilk
2014-07-15 14:23 ` Konrad Rzeszutek Wilk
2014-06-15 12:47 ` [PATCH 11/11] qspinlock, kvm: Add paravirt support Peter Zijlstra
2014-06-22 16:36 ` Raghavendra K T
2014-06-22 16:36 ` Raghavendra K T
2014-07-07 15:23 ` Peter Zijlstra
2014-07-07 15:23 ` Peter Zijlstra
2014-06-16 20:52 ` [PATCH 00/11] qspinlock with " Konrad Rzeszutek Wilk
2014-06-16 20:52 ` Konrad Rzeszutek Wilk
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=53A17B15.3080904@redhat.com \
--to=pbonzini@redhat.com \
--cc=Waiman.Long@hp.com \
--cc=a.p.zijlstra@chello.nl \
--cc=boris.ostrovsky@oracle.com \
--cc=chegu_vinod@hp.com \
--cc=david.vrabel@citrix.com \
--cc=gleb@redhat.com \
--cc=konrad.wilk@oracle.com \
--cc=kvm@vger.kernel.org \
--cc=linux-arch@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=mingo@kernel.org \
--cc=oleg@redhat.com \
--cc=paolo.bonzini@gmail.com \
--cc=paulmck@linux.vnet.ibm.com \
--cc=peterz@infradead.org \
--cc=raghavendra.kt@linux.vnet.ibm.com \
--cc=riel@redhat.com \
--cc=scott.norton@hp.com \
--cc=tglx@linutronix.de \
--cc=torvalds@linux-foundation.org \
--cc=virtualization@lists.linux-foundation.org \
--cc=xen-devel@lists.xenproject.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;
as well as URLs for NNTP newsgroup(s).