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([145.224.90.227]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-436e2ddccf4sm22836965e9.19.2025.01.08.06.30.27 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 08 Jan 2025 06:30:28 -0800 (PST) From: James Clark To: linux-arm-kernel@lists.infradead.org, linux-perf-users@vger.kernel.org, irogers@google.com, yeoreum.yun@arm.com, will@kernel.org, mark.rutland@arm.com, namhyung@kernel.org, acme@kernel.org Cc: robh@kernel.org, James Clark , Peter Zijlstra , Ingo Molnar , Alexander Shishkin , Jiri Olsa , Adrian Hunter , "Liang, Kan" , John Garry , Mike Leach , Leo Yan , Graham Woodward , Veronika Molnarova , Michael Petlan , Thomas Richter , Athira Rajeev , linux-kernel@vger.kernel.org, bpf@vger.kernel.org Subject: [PATCH v3 4/5] perf tool: arm-spe: Don't allocate buffer or tracking event in discard mode Date: Wed, 8 Jan 2025 14:28:59 +0000 Message-Id: <20250108142904.401139-5-james.clark@linaro.org> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20250108142904.401139-1-james.clark@linaro.org> References: <20250108142904.401139-1-james.clark@linaro.org> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" The buffer will never be written to so don't bother allocating it. The tracking event is also not required. Reviewed-by: Yeoreum Yun Signed-off-by: James Clark --- tools/perf/arch/arm64/util/arm-spe.c | 11 +++++++++-- 1 file changed, 9 insertions(+), 2 deletions(-) diff --git a/tools/perf/arch/arm64/util/arm-spe.c b/tools/perf/arch/arm64/u= til/arm-spe.c index 1b543855f206..4301181b8e45 100644 --- a/tools/perf/arch/arm64/util/arm-spe.c +++ b/tools/perf/arch/arm64/util/arm-spe.c @@ -376,7 +376,7 @@ static int arm_spe_recording_options(struct auxtrace_re= cord *itr, container_of(itr, struct arm_spe_recording, itr); struct evsel *evsel, *tmp; struct perf_cpu_map *cpus =3D evlist->core.user_requested_cpus; - + bool discard =3D false; int err; =20 sper->evlist =3D evlist; @@ -396,10 +396,17 @@ static int arm_spe_recording_options(struct auxtrace_= record *itr, return 0; =20 evlist__for_each_entry_safe(evlist, tmp, evsel) { - if (evsel__is_aux_event(evsel)) + if (evsel__is_aux_event(evsel)) { arm_spe_setup_evsel(evsel, cpus); + if (evsel->core.attr.config & + perf_pmu__format_bits(evsel->pmu, "discard")) + discard =3D true; + } } =20 + if (discard) + return 0; + err =3D arm_spe_setup_aux_buffer(opts); if (err) return err; --=20 2.34.1