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Wed, 07 Aug 2024 17:02:44 -0700 (PDT) Received: from charlie.ba.rivosinc.com ([64.71.180.162]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-1ff58f586f7sm112867015ad.90.2024.08.07.17.02.43 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 07 Aug 2024 17:02:44 -0700 (PDT) From: Charlie Jenkins Date: Wed, 07 Aug 2024 17:02:41 -0700 Subject: [PATCH v2 2/3] perf: Document PERF_EVENT_IOC_INC_EVENT_LIMIT Precedence: bulk X-Mailing-List: linux-perf-users@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20240807-perf_set_event_limit-v2-2-823b78d04c76@rivosinc.com> References: <20240807-perf_set_event_limit-v2-0-823b78d04c76@rivosinc.com> In-Reply-To: <20240807-perf_set_event_limit-v2-0-823b78d04c76@rivosinc.com> To: Peter Zijlstra , Ingo Molnar , Arnaldo Carvalho de Melo , Namhyung Kim , Mark Rutland , Alexander Shishkin , Jiri Olsa , Ian Rogers , Adrian Hunter , Atish Patra Cc: linux-perf-users@vger.kernel.org, linux-kernel@vger.kernel.org, Charlie Jenkins X-Mailer: b4 0.13.0 X-Developer-Signature: v=1; a=ed25519-sha256; t=1723075360; l=886; i=charlie@rivosinc.com; s=20231120; h=from:subject:message-id; bh=FXzXJ8puJjRyzaYQf/myhvlspm+dHOOl1FmtKrgxWKo=; b=zxkkEMsw1fY3iXS14KmuJbEETHUB2sYYNZ4YGRtAubtK784e+Rwc2ub71UN51Qt6C6UAr2WLz 4rd2xDBV/x+BnyByKWEeHW2ZoFdgx1NQfDOnDMbQsgsQ9c47n7VdvL5 X-Developer-Key: i=charlie@rivosinc.com; a=ed25519; pk=t4RSWpMV1q5lf/NWIeR9z58bcje60/dbtxxmoSfBEcs= Introduce PERF_EVENT_IOC_INC_EVENT_LIMIT and explain the differences between it and PERF_EVENT_IOC_REFRESH. Signed-off-by: Charlie Jenkins --- tools/perf/design.txt | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/tools/perf/design.txt b/tools/perf/design.txt index aa8cfeabb743..1626ae83785a 100644 --- a/tools/perf/design.txt +++ b/tools/perf/design.txt @@ -439,6 +439,11 @@ Additionally, non-inherited overflow counters can use to enable a counter for 'nr' events, after which it gets disabled again. +PERF_EVENT_IOC_REFRESH will increment the event limit by 'nr' and enable the +event. To increment the event limit without enabling it, use the following: + + ioctl(fd, PERF_EVENT_IOC_INC_EVENT_LIMIT, nr); + A process can enable or disable all the counter groups that are attached to it, using prctl: -- 2.45.0