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From: Sai Prakash Ranjan <saiprakash.ranjan@codeaurora.org>
To: Suzuki K Poulose <suzuki.poulose@arm.com>,
	gregkh@linuxfoundation.org, mathieu.poirier@linaro.org,
	leo.yan@linaro.org, alexander.shishkin@linux.intel.com,
	mike.leach@linaro.org, robh+dt@kernel.org,
	bjorn.andersson@linaro.org, devicetree@vger.kernel.org,
	david.brown@linaro.org, mark.rutland@arm.com
Cc: rnayak@codeaurora.org, marc.w.gonzalez@free.fr,
	linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org,
	sibis@codeaurora.org, vivek.gautam@codeaurora.org,
	linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCHv8 2/5] arm64: dts: qcom: msm8998: Add Coresight support
Date: Thu, 18 Jul 2019 15:23:49 +0530
Message-ID: <2b08943b-3900-ceb5-15ac-28ef2bbad03e@codeaurora.org> (raw)
In-Reply-To: <281e3548-af53-f9a7-b9e4-813b448ab078@arm.com>

Hi,

On 7/18/2019 3:07 PM, Suzuki K Poulose wrote:
> 
> 
> Using the sysfs doesn't guarantee that the ETR actually uses SG mode, 
> unless
> the buffer size selected is > 1M, which is why I am more interested in the
> perf usage. Alternatively you may configure a larger buffer size (say, 
> 8MB) via:
> 
> echo 0x800000 > /sys/bus/coresight/.../tmc_etr0/buffer_size
> 

Yes, you had mentioned about setting buffer size > 1M in the same 
thread[1] and I had followed the same.

[1] https://lkml.org/lkml/2019/1/18/311

> 
>>
>> As said in one of the series initially [1], QCOM msm downstream kernels
>> have been using scatter gather mode and we haven't seen any fatal issues.
>>
>> [1] https://patchwork.kernel.org/patch/10769535/
> 
> I haven't seen any test results there either.
> 

You did not ask for it there ;)

I do not have the test results handy now and those platforms.
I will arrange for them and post some test results.

Just to confirm, do you need some traces or just the buffer size
and sink set?

Thanks,
Sai

-- 
QUALCOMM INDIA, on behalf of Qualcomm Innovation Center, Inc. is a member
of Code Aurora Forum, hosted by The Linux Foundation

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Thread overview: 22+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-07-12 14:16 [PATCHv8 0/5] Add coresight support for SDM845, MSM8998 and MSM8996 Sai Prakash Ranjan
2019-07-12 14:16 ` [PATCHv8 1/5] arm64: dts: qcom: sdm845: Add Coresight support Sai Prakash Ranjan
2019-07-12 16:44   ` Suzuki K Poulose
2019-07-12 16:49     ` saiprakash.ranjan
2019-07-19  9:46   ` Suzuki K Poulose
2019-07-19 10:28     ` Sai Prakash Ranjan
2019-07-12 14:16 ` [PATCHv8 2/5] arm64: dts: qcom: msm8998: " Sai Prakash Ranjan
2019-07-18  8:28   ` Suzuki K Poulose
2019-07-18  9:14     ` Sai Prakash Ranjan
2019-07-18  9:37       ` Suzuki K Poulose
2019-07-18  9:53         ` Sai Prakash Ranjan [this message]
2019-07-12 14:16 ` [PATCHv8 3/5] arm64: dts: qcom: msm8996: " Sai Prakash Ranjan
2019-07-17 17:00   ` Mathieu Poirier
2019-07-18  5:47     ` Sai Prakash Ranjan
2019-07-18 15:31       ` Mathieu Poirier
2019-07-18 15:48         ` Bjorn Andersson
2019-07-12 14:16 ` [PATCHv8 4/5] coresight: etm4x: Add ETM PIDs for SDM845 and MSM8996 Sai Prakash Ranjan
2019-07-17 17:40   ` Mathieu Poirier
2019-07-12 14:16 ` [PATCHv8 5/5] coresight: cpu-debug: Add support for Qualcomm Kryo Sai Prakash Ranjan
2019-07-17 16:56   ` Mathieu Poirier
2019-07-21 14:35     ` Leo Yan
2019-07-22  5:48       ` Sai Prakash Ranjan

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