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dmarc=none (p=none dis=none) header.from=codeaurora.org Authentication-Results: pdx-caf-mail.web.codeaurora.org; spf=none smtp.mailfrom=saiprakash.ranjan@codeaurora.org Subject: Re: [PATCHv8 2/5] arm64: dts: qcom: msm8998: Add Coresight support To: Suzuki K Poulose , 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 References: <3b192063-f31f-b861-d913-61d737cecc57@arm.com> <4854b0f7-6a81-bc87-3e63-d2b7c68a44f6@codeaurora.org> <281e3548-af53-f9a7-b9e4-813b448ab078@arm.com> From: Sai Prakash Ranjan Message-ID: <2b08943b-3900-ceb5-15ac-28ef2bbad03e@codeaurora.org> Date: Thu, 18 Jul 2019 15:23:49 +0530 User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:60.0) Gecko/20100101 Thunderbird/60.8.0 MIME-Version: 1.0 In-Reply-To: <281e3548-af53-f9a7-b9e4-813b448ab078@arm.com> Content-Language: en-US X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190718_025402_206274_F65A6EB1 X-CRM114-Status: GOOD ( 14.23 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , 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 Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset="us-ascii"; Format="flowed" Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org 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 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel