From: Paolo Bonzini <pbonzini@redhat.com>
To: Peter Zijlstra <peterz@infradead.org>
Cc: Waiman.Long@hp.com, linux-arch@vger.kernel.org, riel@redhat.com,
gleb@redhat.com, kvm@vger.kernel.org, konrad.wilk@oracle.com,
boris.ostrovsky@oracle.com, 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, tglx@linutronix.de,
paulmck@linux.vnet.ibm.com, torvalds@linux-foundation.org,
mingo@kernel.org
Subject: Re: [PATCH 05/11] qspinlock: Optimize for smaller NR_CPUS
Date: Mon, 07 Jul 2014 18:10:30 +0200 [thread overview]
Message-ID: <53BAC676.5030804@redhat.com> (raw)
In-Reply-To: <20140707153552.GE19379@twins.programming.kicks-ass.net>
Il 07/07/2014 17:35, Peter Zijlstra ha scritto:
>> > Unlike the change in patch 4, clear_pending_set_locked doesn't change how
>> > qspinlock moves from a state to the next.
> True, but its where we start to break up into smaller functions. And the
> only reason we break them out is because we'll get different
> implementations depending on NR_CPUS.
>
> So we can view the breakout of xchg_tail and clear_and_set_pending as
> preparatory work for introducing the NR_CPUS thing.
That's a different reasoning, but it's fine by me too.
Paolo
next prev parent reply other threads:[~2014-07-07 16:10 UTC|newest]
Thread overview: 63+ 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 ` [PATCH 01/11] qspinlock: A simple generic 4-byte queue spinlock Peter Zijlstra
2014-06-16 20:49 ` Konrad Rzeszutek Wilk
2014-06-17 20:03 ` Konrad Rzeszutek Wilk
2014-06-23 16:12 ` Peter Zijlstra
2014-06-23 16:20 ` Konrad Rzeszutek Wilk
2014-06-23 15:56 ` Peter Zijlstra
[not found] ` <20140623155650.GF19860@laptop.programming.kicks-ass.net>
2014-06-23 16:16 ` Konrad Rzeszutek Wilk
2014-06-17 20:05 ` Konrad Rzeszutek Wilk
2014-06-23 16:26 ` Peter Zijlstra
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 12:47 ` [PATCH 03/11] qspinlock: Add pending bit Peter Zijlstra
2014-06-17 20:36 ` Konrad Rzeszutek Wilk
2014-06-17 20:51 ` Waiman Long
2014-06-17 21:07 ` Konrad Rzeszutek Wilk
2014-06-17 21:10 ` Konrad Rzeszutek Wilk
2014-06-17 22:25 ` Waiman Long
2014-06-24 8:24 ` Peter Zijlstra
2014-06-18 11:29 ` Paolo Bonzini
2014-06-18 13:36 ` Konrad Rzeszutek Wilk
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
2014-06-15 12:47 ` [PATCH 05/11] qspinlock: Optimize for smaller NR_CPUS Peter Zijlstra
2014-06-18 11:39 ` Paolo Bonzini
2014-07-07 14:35 ` Peter Zijlstra
2014-07-07 15:08 ` Paolo Bonzini
[not found] ` <53BAB7E1.4010506@redhat.com>
2014-07-07 15:35 ` Peter Zijlstra
2014-07-07 16:10 ` Paolo Bonzini [this message]
2014-06-18 15:57 ` Konrad Rzeszutek Wilk
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 ` [PATCH 07/11] qspinlock: Use a simple write to grab the lock, if applicable Peter Zijlstra
2014-06-18 16:36 ` Konrad Rzeszutek Wilk
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
2014-06-16 21:57 ` Waiman Long
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 ` [PATCH 10/11] qspinlock: Paravirt support Peter Zijlstra
2014-06-15 12:47 ` [PATCH 11/11] qspinlock, kvm: Add paravirt support Peter Zijlstra
2014-06-16 20:52 ` [PATCH 00/11] qspinlock with " Konrad Rzeszutek Wilk
[not found] ` <20140615130153.376621956@chello.nl>
2014-06-17 20:55 ` [PATCH 04/11] qspinlock: Extract out the exchange of tail code word Konrad Rzeszutek Wilk
2014-06-18 11:37 ` Paolo Bonzini
2014-06-18 13:50 ` Konrad Rzeszutek Wilk
2014-06-18 15:46 ` Waiman Long
2014-06-18 15:49 ` Paolo Bonzini
2014-06-18 16:02 ` Konrad Rzeszutek Wilk
2014-06-24 10:47 ` Peter Zijlstra
[not found] ` <20140615130153.638054585@chello.nl>
2014-06-18 11:42 ` [PATCH 06/11] qspinlock: Optimize pending bit Paolo Bonzini
[not found] ` <20140615130154.068615764@chello.nl>
2014-06-18 16:43 ` [PATCH 09/11] pvqspinlock, x86: Rename paravirt_ticketlocks_enabled Konrad Rzeszutek Wilk
[not found] ` <20140615130154.213923590@chello.nl>
2014-06-16 22:08 ` [PATCH 10/11] qspinlock: Paravirt support Waiman Long
2014-06-18 12:03 ` Paolo Bonzini
2014-06-18 15:26 ` Waiman Long
2014-07-07 15:20 ` Peter Zijlstra
2014-07-07 15:20 ` Peter Zijlstra
2014-06-17 0:53 ` Waiman Long
2014-06-18 12:04 ` Paolo Bonzini
2014-06-20 13:46 ` Konrad Rzeszutek Wilk
2014-07-07 15:27 ` Peter Zijlstra
[not found] ` <20140707152734.GX6758@twins.programming.kicks-ass.net>
2014-07-15 14:23 ` Konrad Rzeszutek Wilk
[not found] ` <20140615130154.400698797@chello.nl>
2014-06-22 16:36 ` [PATCH 11/11] qspinlock, kvm: Add paravirt support Raghavendra K T
2014-07-07 15:23 ` Peter Zijlstra
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