From: Waiman Long <waiman.long@hp.com>
To: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Cc: linux-arch@vger.kernel.org,
Raghavendra K T <raghavendra.kt@linux.vnet.ibm.com>,
Gleb Natapov <gleb@redhat.com>,
kvm@vger.kernel.org, Peter Zijlstra <peterz@infradead.org>,
Scott J Norton <scott.norton@hp.com>,
x86@kernel.org, Paolo Bonzini <paolo.bonzini@gmail.com>,
linux-kernel@vger.kernel.org,
virtualization@lists.linux-foundation.org,
Ingo Molnar <mingo@redhat.com>, Chegu Vinod <chegu_vinod@hp.com>,
David Vrabel <david.vrabel@citrix.com>,
"H. Peter Anvin" <hpa@zytor.com>,
xen-devel@lists.xenproject.org,
Thomas Gleixner <tglx@linutronix.de>,
"Paul E. McKenney" <paulmck@linux.vnet.ibm.com>,
Linus Torvalds <torvalds@linux-foundation.org>,
Oleg Nesterov <oleg@redhat.com>,
Aswin Chandramouleeswaran <aswin@hp.com>
Subject: Re: [PATCH v8 10/10] pvqspinlock, x86: Enable qspinlock PV support for XEN
Date: Wed, 02 Apr 2014 16:38:47 -0400 [thread overview]
Message-ID: <533C7557.60908@hp.com> (raw)
In-Reply-To: <20140402143932.GA13097@phenom.dumpdata.com>
On 04/02/2014 10:39 AM, Konrad Rzeszutek Wilk wrote:
>> diff --git a/kernel/Kconfig.locks b/kernel/Kconfig.locks
>> index a70fdeb..451e392 100644
>> --- a/kernel/Kconfig.locks
>> +++ b/kernel/Kconfig.locks
>> @@ -229,4 +229,4 @@ config ARCH_USE_QUEUE_SPINLOCK
>>
>> config QUEUE_SPINLOCK
>> def_bool y if ARCH_USE_QUEUE_SPINLOCK
>> - depends on SMP&& (!PARAVIRT_SPINLOCKS || !XEN)
>> + depends on SMP
> If I read this correctly that means you cannot select any more the old
> ticketlocks? As in, if you select CONFIG_PARAVIRT on X86 it will automatically
> select ARCH_USE_QUEUE_SPINLOCK which will then enable this by default?
>
> Should the 'def_bool' be selectable?
My initial qspinlock patch allows it to be selectable, but there was
comment that doing so would increase the testing matrix and so made it
less desirable. That was why I made it the default for 64-bit code which
are more likely to be used in large machines which benefit the most from
this patch. 32-bit kernel will still use the ticket lock.
-Longman
WARNING: multiple messages have this Message-ID (diff)
From: Waiman Long <waiman.long@hp.com>
To: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Cc: Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>, "H. Peter Anvin" <hpa@zytor.com>,
Peter Zijlstra <peterz@infradead.org>,
linux-arch@vger.kernel.org, x86@kernel.org,
linux-kernel@vger.kernel.org,
virtualization@lists.linux-foundation.org,
xen-devel@lists.xenproject.org, kvm@vger.kernel.org,
Paolo Bonzini <paolo.bonzini@gmail.com>,
"Paul E. McKenney" <paulmck@linux.vnet.ibm.com>,
Rik van Riel <riel@redhat.com>,
Linus Torvalds <torvalds@linux-foundation.org>,
Raghavendra K T <raghavendra.kt@linux.vnet.ibm.com>,
David Vrabel <david.vrabel@citrix.com>,
Oleg Nesterov <oleg@redhat.com>, Gleb Natapov <gleb@redhat.com>,
Aswin Chandramouleeswaran <aswin@hp.com>,
Scott J Norton <scott.norton@hp.com>,
Chegu Vinod <chegu_vinod@hp.com>
Subject: Re: [PATCH v8 10/10] pvqspinlock, x86: Enable qspinlock PV support for XEN
Date: Wed, 02 Apr 2014 16:38:47 -0400 [thread overview]
Message-ID: <533C7557.60908@hp.com> (raw)
Message-ID: <20140402203847.dKlPM3WLJUe35ZyCihVvsP4IW7XpUxgmh_imVm5MK7I@z> (raw)
In-Reply-To: <20140402143932.GA13097@phenom.dumpdata.com>
On 04/02/2014 10:39 AM, Konrad Rzeszutek Wilk wrote:
>> diff --git a/kernel/Kconfig.locks b/kernel/Kconfig.locks
>> index a70fdeb..451e392 100644
>> --- a/kernel/Kconfig.locks
>> +++ b/kernel/Kconfig.locks
>> @@ -229,4 +229,4 @@ config ARCH_USE_QUEUE_SPINLOCK
>>
>> config QUEUE_SPINLOCK
>> def_bool y if ARCH_USE_QUEUE_SPINLOCK
>> - depends on SMP&& (!PARAVIRT_SPINLOCKS || !XEN)
>> + depends on SMP
> If I read this correctly that means you cannot select any more the old
> ticketlocks? As in, if you select CONFIG_PARAVIRT on X86 it will automatically
> select ARCH_USE_QUEUE_SPINLOCK which will then enable this by default?
>
> Should the 'def_bool' be selectable?
My initial qspinlock patch allows it to be selectable, but there was
comment that doing so would increase the testing matrix and so made it
less desirable. That was why I made it the default for 64-bit code which
are more likely to be used in large machines which benefit the most from
this patch. 32-bit kernel will still use the ticket lock.
-Longman
next prev parent reply other threads:[~2014-04-02 20:38 UTC|newest]
Thread overview: 108+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-04-02 13:27 [PATCH v8 00/10] qspinlock: a 4-byte queue spinlock with PV support Waiman Long
2014-04-02 13:27 ` [PATCH v8 01/10] qspinlock: A generic 4-byte queue spinlock implementation Waiman Long
2014-04-02 13:27 ` Waiman Long
2014-04-04 13:00 ` Peter Zijlstra
2014-04-04 13:00 ` Peter Zijlstra
2014-04-04 13:00 ` Peter Zijlstra
2014-04-04 14:59 ` Waiman Long
2014-04-04 14:59 ` Waiman Long
2014-04-04 17:53 ` Ingo Molnar
2014-04-04 17:53 ` Ingo Molnar
2014-04-04 17:53 ` Ingo Molnar
2014-04-07 14:16 ` Peter Zijlstra
2014-04-07 14:16 ` Peter Zijlstra
2014-04-07 14:16 ` Peter Zijlstra
2014-04-04 14:59 ` Waiman Long
2014-04-04 16:57 ` Konrad Rzeszutek Wilk
2014-04-04 16:57 ` Konrad Rzeszutek Wilk
2014-04-04 17:08 ` Waiman Long
2014-04-04 17:08 ` Waiman Long
2014-04-04 17:08 ` Waiman Long
2014-04-04 17:54 ` Ingo Molnar
2014-04-04 17:54 ` Ingo Molnar
2014-04-04 17:54 ` Ingo Molnar
2014-04-07 14:09 ` Peter Zijlstra
2014-04-07 14:09 ` Peter Zijlstra
2014-04-07 16:59 ` Waiman Long
2014-04-07 16:59 ` Waiman Long
2014-04-07 16:59 ` Waiman Long
2014-04-07 14:09 ` Peter Zijlstra
2014-04-07 14:12 ` Peter Zijlstra
2014-04-07 14:12 ` Peter Zijlstra
2014-04-07 14:33 ` Konrad Rzeszutek Wilk
2014-04-07 14:33 ` Konrad Rzeszutek Wilk
2014-04-07 14:33 ` Konrad Rzeszutek Wilk
2014-04-07 14:12 ` Peter Zijlstra
2014-04-04 16:57 ` Konrad Rzeszutek Wilk
2014-04-02 13:27 ` [PATCH v8 02/10] qspinlock, x86: Enable x86-64 to use queue spinlock Waiman Long
2014-04-02 13:27 ` Waiman Long
2014-04-02 13:27 ` [PATCH v8 03/10] qspinlock: More optimized code for smaller NR_CPUS Waiman Long
2014-04-02 13:27 ` Waiman Long
2014-04-02 13:27 ` [PATCH v8 04/10] qspinlock: Optimized code path for 2 contending tasks Waiman Long
2014-04-02 13:27 ` Waiman Long
2014-04-02 13:27 ` [PATCH v8 05/10] pvqspinlock, x86: Allow unfair spinlock in a PV guest Waiman Long
2014-04-02 13:27 ` Waiman Long
2014-04-02 13:27 ` [PATCH v8 06/10] pvqspinlock: Enable lock stealing in queue lock waiters Waiman Long
2014-04-02 13:27 ` Waiman Long
2014-04-02 13:27 ` [PATCH v8 07/10] pvqspinlock, x86: Rename paravirt_ticketlocks_enabled Waiman Long
2014-04-02 13:27 ` Waiman Long
2014-04-02 13:27 ` [PATCH v8 08/10] pvqspinlock, x86: Add qspinlock para-virtualization support Waiman Long
2014-04-02 13:27 ` Waiman Long
2014-04-02 13:27 ` [PATCH v8 09/10] pvqspinlock, x86: Enable qspinlock PV support for KVM Waiman Long
2014-04-02 13:27 ` Waiman Long
2014-04-02 13:27 ` [PATCH v8 10/10] pvqspinlock, x86: Enable qspinlock PV support for XEN Waiman Long
2014-04-02 13:27 ` Waiman Long
2014-04-02 14:39 ` Konrad Rzeszutek Wilk
2014-04-02 14:39 ` Konrad Rzeszutek Wilk
2014-04-02 20:38 ` Waiman Long [this message]
2014-04-02 20:38 ` Waiman Long
2014-04-02 14:32 ` [PATCH v8 00/10] qspinlock: a 4-byte queue spinlock with PV support Konrad Rzeszutek Wilk
2014-04-02 14:32 ` Konrad Rzeszutek Wilk
2014-04-02 20:35 ` Waiman Long
2014-04-03 2:10 ` Waiman Long
2014-04-03 2:10 ` Waiman Long
2014-04-03 17:23 ` Konrad Rzeszutek Wilk
2014-04-03 17:23 ` Konrad Rzeszutek Wilk
2014-04-03 17:23 ` Konrad Rzeszutek Wilk
2014-04-04 2:57 ` Waiman Long
2014-04-04 2:57 ` Waiman Long
2014-04-04 16:55 ` Konrad Rzeszutek Wilk
2014-04-04 16:55 ` Konrad Rzeszutek Wilk
2014-04-04 16:55 ` Konrad Rzeszutek Wilk
2014-04-04 16:55 ` Konrad Rzeszutek Wilk
2014-04-04 17:13 ` Waiman Long
2014-04-04 17:13 ` Waiman Long
2014-04-04 17:13 ` Waiman Long
2014-04-04 17:58 ` Konrad Rzeszutek Wilk
2014-04-04 17:58 ` Konrad Rzeszutek Wilk
2014-04-04 17:58 ` Konrad Rzeszutek Wilk
2014-04-04 18:33 ` Konrad Rzeszutek Wilk
2014-04-04 18:33 ` Konrad Rzeszutek Wilk
2014-04-04 18:33 ` Konrad Rzeszutek Wilk
2014-04-04 18:14 ` Marcos E. Matsunaga
2014-04-04 18:14 ` Marcos E. Matsunaga
2014-04-04 18:14 ` Marcos E. Matsunaga
2014-04-04 16:55 ` Konrad Rzeszutek Wilk
2014-04-04 2:57 ` Waiman Long
2014-04-03 2:10 ` Waiman Long
2014-04-02 20:35 ` Waiman Long
2014-04-04 15:25 ` Konrad Rzeszutek Wilk
2014-04-04 15:25 ` Konrad Rzeszutek Wilk
2014-04-04 15:25 ` Konrad Rzeszutek Wilk
2014-04-07 6:14 ` Raghavendra K T
2014-04-07 6:14 ` Raghavendra K T
2014-04-07 6:14 ` Raghavendra K T
2014-04-07 16:38 ` Waiman Long
2014-04-07 16:38 ` Waiman Long
2014-04-07 16:38 ` Waiman Long
2014-04-07 17:51 ` Raghavendra K T
2014-04-07 17:51 ` Raghavendra K T
2014-04-07 17:51 ` Raghavendra K T
2014-04-08 19:15 ` Waiman Long
2014-04-08 19:15 ` Waiman Long
2014-04-08 19:15 ` Waiman Long
2014-04-09 12:08 ` Raghavendra K T
2014-04-09 12:08 ` Raghavendra K T
2014-04-09 12:08 ` Raghavendra K T
-- strict thread matches above, loose matches on Subject: below --
2014-04-01 20:47 Waiman Long
2014-04-01 20:47 ` [PATCH v8 10/10] pvqspinlock, x86: Enable qspinlock PV support for XEN Waiman Long
2014-04-01 20:47 ` Waiman Long
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