From: "Leizhen (ThunderTown)" <thunder.leizhen@huawei•com>
To: Will Deacon <will@kernel•org>
Cc: Jean-Philippe Brucker <jean-philippe@linaro•org>,
Joerg Roedel <joro@8bytes•org>,
John Garry <john.garry@huawei•com>,
iommu <iommu@lists•linux-foundation.org>,
Robin Murphy <robin.murphy@arm•com>,
linux-arm-kernel <linux-arm-kernel@lists•infradead.org>
Subject: Re: [PATCH v3 0/2] improve the concurrency of arm_smmu_atc_inv_domain()
Date: Fri, 23 Aug 2019 17:05:40 +0800 [thread overview]
Message-ID: <c7de4504-6253-49ef-c628-5a702e28fc8d@huawei.com> (raw)
In-Reply-To: <20190823083712.ggzmw3rcodwyhmlf@willie-the-truck>
On 2019/8/23 16:37, Will Deacon wrote:
> On Fri, Aug 23, 2019 at 04:06:52PM +0800, Leizhen (ThunderTown) wrote:
>>
>>
>> On 2019/8/23 15:50, Will Deacon wrote:
>>> On Fri, Aug 23, 2019 at 10:45:49AM +0800, Zhen Lei wrote:
>>>> v2 --> v3:
>>>> As Will Deacon's suggestion, I changed the lock type of
>>>> arm_smmu_domain.devices_lock from spinlock_t to rwlock_t, and I saw that the
>>>> performance is all right. And further use nr_ats_masters to quickly check have
>>>> no obvious effect, so I drop it.
>>>
>>> :/
>>>
>>> I already sent two versions of a series fixing this without any locking at
>>> all on the ->unmap() path, and you were on cc. I've also queued that stuff
>>> up.
>>>
>>> Did you not receive my patches?
>> Sorry, my message filter setting is a bit wrong, must contains
>> "linux-kernel@vger•kernel.org", I have corrected it.
>
> Ha, sounds like the opposite of my email filter ;)
>
>>> v1: https://lists.linuxfoundation.org/pipermail/iommu/2019-August/038306.html
>>> v2: https://lists.linuxfoundation.org/pipermail/iommu/2019-August/038374.html
>> OK, I will test it when it's my turn to use the board.
>
> Thanks, although I plan to send it to Joerg today so any changes will need
> to go on top. Does your testing involve ATS, or just non-ATS devices? I've
I also currently only have non-ATS devices.
> tested the latter locally, although I haven't looked at the performance
> since most of the patches are trying to fix the enable/disable ordering.
>
> Thanks,
>
> Will
>
> .
>
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next prev parent reply other threads:[~2019-08-23 9:08 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-08-23 2:45 [PATCH v3 0/2] improve the concurrency of arm_smmu_atc_inv_domain() Zhen Lei
2019-08-23 2:45 ` [PATCH v3 1/2] iommu/arm-smmu-v3: don't add a master into smmu_domain before it's ready Zhen Lei
2019-08-23 2:45 ` [PATCH v3 2/2] iommu/arm-smmu-v3: change the lock type of arm_smmu_domain.devices_lock Zhen Lei
2019-08-23 7:50 ` [PATCH v3 0/2] improve the concurrency of arm_smmu_atc_inv_domain() Will Deacon
2019-08-23 8:06 ` Leizhen (ThunderTown)
2019-08-23 8:37 ` Will Deacon
2019-08-23 9:05 ` Leizhen (ThunderTown) [this message]
2019-09-17 14:35 ` Leizhen (ThunderTown)
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