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From: Will Deacon <will@kernel.org>
To: "Leizhen (ThunderTown)" <thunder.leizhen@huawei.com>
Cc: John Garry <john.garry@huawei.com>,
	Robin Murphy <robin.murphy@arm.com>,
	Joerg Roedel <joro@8bytes.org>,
	linux-arm-kernel <linux-arm-kernel@lists.infradead.org>,
	iommu <iommu@lists.linux-foundation.org>,
	linux-kernel@vger.kernel.org
Subject: Re: [PATCH 1/4] iommu/arm-smmu-v3: Use command queue batching helpers to improve performance
Date: Mon, 16 Aug 2021 09:21:27 +0100	[thread overview]
Message-ID: <20210816082126.GA11011@willie-the-truck> (raw)
In-Reply-To: <e8b71423-e827-f141-1203-00aca2e70834@huawei.com>

On Mon, Aug 16, 2021 at 03:47:58PM +0800, Leizhen (ThunderTown) wrote:
> 
> 
> On 2021/8/16 15:24, John Garry wrote:
> >> In addition, I find that function arm_smmu_cmdq_build_cmd() can also be optimized
> >> slightly, three useless instructions can be reduced.
> > 
> > I think that you could optimise further by pre-building commonly used commands.
> > 
> > For example, CMD_SYNC without MSI polling is always the same. And then only different in 1 field for MSI polling.
> > 
> > But you need to check if the performance gain is worth the change.
> 
> Good advice. I can give it a try.

Please send it as a new patch on top. I've queued the old one and sent
it to Joerg. Since this is just further cleanup, it can be done separately.

Will

  reply	other threads:[~2021-08-16  8:21 UTC|newest]

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-11 11:48 [PATCH 0/4] Prepare for ECMDQ support Zhen Lei
2021-08-11 11:48 ` [PATCH 1/4] iommu/arm-smmu-v3: Use command queue batching helpers to improve performance Zhen Lei
2021-08-13 16:01   ` Robin Murphy
2021-08-13 16:45     ` John Garry
2021-08-16  2:15       ` Leizhen (ThunderTown)
2021-08-16  4:05         ` Leizhen (ThunderTown)
2021-08-16  7:24           ` John Garry
2021-08-16  7:47             ` Leizhen (ThunderTown)
2021-08-16  8:21               ` Will Deacon [this message]
2021-08-16  8:41                 ` Leizhen (ThunderTown)
2021-08-11 11:48 ` [PATCH 2/4] iommu/arm-smmu-v3: Add and use static helper function arm_smmu_cmdq_issue_cmd_with_sync() Zhen Lei
2021-08-11 11:48 ` [PATCH 3/4] iommu/arm-smmu-v3: Add and use static helper function arm_smmu_get_cmdq() Zhen Lei
2021-08-11 11:48 ` [PATCH 4/4] iommu/arm-smmu-v3: Extract reusable function __arm_smmu_cmdq_skip_err() Zhen Lei
2021-08-13 14:33 ` [PATCH 0/4] Prepare for ECMDQ support Will Deacon

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