From: Pan Xinhui <xinhui@linux.vnet.ibm.com>
To: Boqun Feng <boqun.feng@gmail.com>,
Pan Xinhui <xinhui.pan@linux.vnet.ibm.com>
Cc: linux-kernel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org,
benh@kernel.crashing.org, paulus@samba.org, mpe@ellerman.id.au,
peterz@infradead.org, mingo@redhat.com,
paulmck@linux.vnet.ibm.com, waiman.long@hpe.com,
virtualization@lists.linux-foundation.org
Subject: Re: [PATCH v8 2/6] powerpc: pSeries/Kconfig: Add qspinlock build config
Date: Tue, 6 Dec 2016 10:12:56 +0800 [thread overview]
Message-ID: <945a9698-e02e-e004-f1df-cabded4d8398@linux.vnet.ibm.com> (raw)
In-Reply-To: <2d4eb891-e999-b7f8-52ff-31ef7bb8af6b@linux.vnet.ibm.com>
在 2016/12/6 09:24, Pan Xinhui 写道:
>
>
> 在 2016/12/6 08:58, Boqun Feng 写道:
>> On Mon, Dec 05, 2016 at 10:19:22AM -0500, Pan Xinhui wrote:
>>> pSeries/powerNV will use qspinlock from now on.
>>>
>>> Signed-off-by: Pan Xinhui <xinhui.pan@linux.vnet.ibm.com>
>>> ---
>>> arch/powerpc/platforms/pseries/Kconfig | 8 ++++++++
>>> 1 file changed, 8 insertions(+)
>>>
>>> diff --git a/arch/powerpc/platforms/pseries/Kconfig b/arch/powerpc/platforms/pseries/Kconfig
>>> index bec90fb..8a87d06 100644
>>> --- a/arch/powerpc/platforms/pseries/Kconfig
>>> +++ b/arch/powerpc/platforms/pseries/Kconfig
>>
>> Why here? Not arch/powerpc/platforms/Kconfig?
>>
>>> @@ -23,6 +23,14 @@ config PPC_PSERIES
>>> select PPC_DOORBELL
>>> default y
>>>
>>> +config ARCH_USE_QUEUED_SPINLOCKS
>>> + default y
>>> + bool "Enable qspinlock"
>>
>> I think you just enable qspinlock by default for all PPC platforms. I
>> guess you need to put
>>
>> depends on PPC_PSERIES || PPC_POWERNV
>>
>> here to achieve what you mean in you commit message.
>>
oh, yes, need depends on PPC_PSERIES || PPC_POWERNV.
> yes, another good way.
> I prefer to put it in pseries/Kconfig as same as pv-qspinlocks config.
> when we build nv, it still include pSeries's config anyway.
>
> thanks
> xinhui
>
>> Regards,
>> Boqun
>>
>>> + help
>>> + Enabling this option will let kernel use qspinlock which is a kind of
>>> + fairlock. It has shown a good performance improvement on x86 and also ppc
>>> + especially in high contention cases.
>>> +
>>> config PPC_SPLPAR
>>> depends on PPC_PSERIES
>>> bool "Support for shared-processor logical partitions"
>>> --
>>> 2.4.11
>>>
next prev parent reply other threads:[~2016-12-06 2:14 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-12-05 15:19 [PATCH v8 0/6] Implement qspinlock/pv-qspinlock on ppc Pan Xinhui
2016-12-05 15:19 ` [PATCH v8 1/6] powerpc/qspinlock: powerpc support qspinlock Pan Xinhui
2016-12-06 0:47 ` Boqun Feng
2016-12-06 1:16 ` Pan Xinhui
2016-12-05 15:19 ` [PATCH v8 2/6] powerpc: pSeries/Kconfig: Add qspinlock build config Pan Xinhui
2016-12-06 0:58 ` Boqun Feng
2016-12-06 1:24 ` Pan Xinhui
2016-12-06 2:12 ` Pan Xinhui [this message]
2016-12-05 15:19 ` [PATCH v8 3/6] powerpc: lib/locks.c: Add cpu yield/wake helper function Pan Xinhui
2016-12-06 1:23 ` Boqun Feng
2016-12-05 15:19 ` [PATCH v8 4/6] powerpc/pv-qspinlock: powerpc support pv-qspinlock Pan Xinhui
2016-12-05 15:19 ` [PATCH v8 5/6] powerpc: pSeries: Add pv-qspinlock build config/make Pan Xinhui
2016-12-05 15:19 ` [PATCH v8 6/6] powerpc/pv-qspinlock: Optimise native unlock path Pan Xinhui
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