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Tue, 22 Jun 2021 05:58:17 -0700 (PDT) Date: Tue, 22 Jun 2021 20:58:11 +0800 From: Leo Yan To: Denis Nikitin Cc: Suzuki K Poulose , Arnaldo Carvalho de Melo , Mathieu Poirier , Mike Leach , Alexander Shishkin , John Garry , Will Deacon , Peter Zijlstra , Ingo Molnar , Jiri Olsa , Namhyung Kim , Daniel Kiss , Coresight ML , linux-arm-kernel , Linux Kernel Mailing List , linux-perf-users@vger.kernel.org Subject: Re: [PATCH v1 0/3] coresight: Fix for snapshot mode Message-ID: <20210622125811.GB297306@leoy-ThinkPad-X240s> References: <20210528161552.654907-1-leo.yan@linaro.org> <5cf3effb-fccc-9385-6328-6d1e2e5ccdf3@arm.com> <20210612032721.GB36748@leoy-ThinkPad-X240s> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210622_055820_216577_30841BE1 X-CRM114-Status: GOOD ( 17.80 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Hi Denis, On Sun, Jun 20, 2021 at 10:21:57PM -1000, Denis Nikitin wrote: [...] > > I'd like to leave patch 1/3 out, and resend it if we get conclusion. > > At the meantime, @Denis, if you have observed any profiling result > > (or profiling quality) difference caused by patch 1, the feedback would > > be very valuable. > > I evaluated AutoFDO profiles with benchmarks but I was only focused > on the system-wide mode. And as I understood patch 1 fixes the issue > in non system-wide mode. Yes, patch 1 doesn't work for the system-wide mode. In the system-wide mode, CoreSight driver has its own reference counter to only allow the last CPU to fill trace data to AUX buffer. > Currently I'm OoO so I won't be able to do further evaluation. No problem, thanks for the feedback! Leo _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel