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[82.69.66.36]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-4606c0c2442sm1048525f8f.1.2026.06.11.11.54.50 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 11 Jun 2026 11:54:50 -0700 (PDT) Date: Thu, 11 Jun 2026 19:54:49 +0100 From: David Laight To: James Clark Cc: Arnaldo Carvalho de Melo , Namhyung Kim , Ian Rogers , Leo Yan , linux-perf-users@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH] perf test: Compile named_threads workload with -O0 Message-ID: <20260611195449.7230e316@pumpkin> In-Reply-To: <20260611-james-cs-unformatted-per-thread-fix-followup-v1-1-3c855d93dba8@linaro.org> References: <20260611-james-cs-unformatted-per-thread-fix-followup-v1-1-3c855d93dba8@linaro.org> X-Mailer: Claws Mail 4.1.1 (GTK 3.24.38; arm-unknown-linux-gnueabihf) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit On Thu, 11 Jun 2026 12:13:46 +0100 James Clark wrote: > The work loop relies on the compiler not optimizing it away, although > named_threads_work is not static for that reason, the compiler could > still do it. Isn't in enough to put barrier() in the loop? David > > Fix it by compiling without optimization. Also add -fno-inline for > consistency and in case anyone wants to look at callstacks. > > Signed-off-by: James Clark > --- > One trailing Sashiko fix from the "perf cs-etm: Queue context packets > for frontend" patch series that has been applied already. > --- > tools/perf/tests/workloads/Build | 1 + > 1 file changed, 1 insertion(+) > > diff --git a/tools/perf/tests/workloads/Build b/tools/perf/tests/workloads/Build > index 75b377934a0e..7bb4b9829ba2 100644 > --- a/tools/perf/tests/workloads/Build > +++ b/tools/perf/tests/workloads/Build > @@ -26,3 +26,4 @@ CFLAGS_datasym.o = -g -O0 -fno-inline -U_FORTIFY_SOURCE > CFLAGS_traploop.o = -g -O0 -fno-inline -U_FORTIFY_SOURCE > CFLAGS_inlineloop.o = -g -O2 > CFLAGS_deterministic.o = -g -O0 -fno-inline -U_FORTIFY_SOURCE > +CFLAGS_named_threads.o = -g -O0 -fno-inline -U_FORTIFY_SOURCE > > --- > base-commit: 7336514f41e75d44782fee7e0990d4195a3d3161 > change-id: 20260611-james-cs-unformatted-per-thread-fix-followup-babf28a4e640 > > Best regards,