From: Will Deacon <will@kernel.org>
To: Barry Song <song.bao.hua@hisilicon.com>
Cc: iommu@lists.linux-foundation.org, robin.murphy@arm.com,
joro@8bytes.org, linux-arm-kernel@lists.infradead.org,
linuxarm@huawei.com
Subject: Re: [PATCH] iommu/arm-smmu-v3: add tracepoints for cmdq_issue_cmdlist
Date: Fri, 28 Aug 2020 11:29:27 +0100 [thread overview]
Message-ID: <20200828102927.GA30391@willie-the-truck> (raw)
In-Reply-To: <20200827093351.15244-1-song.bao.hua@hisilicon.com>
On Thu, Aug 27, 2020 at 09:33:51PM +1200, Barry Song wrote:
> cmdq_issue_cmdlist() is the hotspot that uses a lot of time. This patch
> adds tracepoints for it to help debug.
>
> Signed-off-by: Barry Song <song.bao.hua@hisilicon.com>
> ---
> * can furthermore develop an eBPF program to benchmark using this trace
Hmm, don't these things have a history of becoming ABI? If so, I don't
really want them in the driver at all, sorry. Do other drivers overcome
this somehow?
Will
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next prev parent reply other threads:[~2020-08-28 10:30 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-08-27 9:33 [PATCH] iommu/arm-smmu-v3: add tracepoints for cmdq_issue_cmdlist Barry Song
2020-08-28 7:41 ` Jean-Philippe Brucker
2020-08-28 7:55 ` Song Bao Hua (Barry Song)
2020-08-28 8:33 ` Jean-Philippe Brucker
2020-08-28 10:29 ` Will Deacon [this message]
2020-08-28 11:02 ` Song Bao Hua (Barry Song)
2020-08-28 11:18 ` Robin Murphy
2020-08-28 11:58 ` Song Bao Hua (Barry Song)
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