From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-pl1-f178.google.com (mail-pl1-f178.google.com [209.85.214.178]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id AA1564A33 for ; Thu, 8 Aug 2024 00:02:45 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.214.178 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1723075367; cv=none; b=RnW4D/I7ckxmEGXp9SHjJM4khokiGI7ZE9b+DlRC0d31ZpYMRC9noFyGxAJr+TheegRE/Nuu9Xd8+em8bR0ohAZnE6GlKYEarb0d8od+JIkBIFCOJAH5Eogwsgi5pfu2oJB125+zRIf5pkQcAXars52JwpgVUMnfgedxpRt7Pto= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1723075367; c=relaxed/simple; bh=FXzXJ8puJjRyzaYQf/myhvlspm+dHOOl1FmtKrgxWKo=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=sfnvY407RowXIzU4UsKS1jKClTa/M3eZtp/VoHgmdwCAtEPAfWJMbm7iE4bMF44PC26XWXpCBzt46ztxNhUhMQ0SGmhNm4HnC0fBrO1j4FpeIJjlUYZKwvHb9P3CRWGDsrDn6F91hWsRZCt+NscIG8A5qXxh2hDqIpCOlcvZZSs= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=rivosinc.com; spf=pass smtp.mailfrom=rivosinc.com; dkim=pass (2048-bit key) header.d=rivosinc-com.20230601.gappssmtp.com header.i=@rivosinc-com.20230601.gappssmtp.com header.b=edtpsP8l; arc=none smtp.client-ip=209.85.214.178 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=rivosinc.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=rivosinc.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=rivosinc-com.20230601.gappssmtp.com header.i=@rivosinc-com.20230601.gappssmtp.com header.b="edtpsP8l" Received: by mail-pl1-f178.google.com with SMTP id d9443c01a7336-1fc56fd4de1so2734505ad.0 for ; Wed, 07 Aug 2024 17:02:45 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=rivosinc-com.20230601.gappssmtp.com; s=20230601; t=1723075365; x=1723680165; darn=vger.kernel.org; h=cc:to:in-reply-to:references:message-id:content-transfer-encoding :mime-version:subject:date:from:from:to:cc:subject:date:message-id :reply-to; bh=cVEM398nfKMPG00719+LnI2T0zzUH1B6VC8Z8aO8SnY=; b=edtpsP8lBsuDbYcLCvNeFe+wollUJWuVAlwxg5A6ulLGV9gNOt3dyLpJoK2/KPA2A4 3msPExSNjpH89B7Io1g11oFhMUR/zybdAJbn9KeppxMmg54Pag3DmpdUUre+aNei7huf G2V86sbhpDlhVbIE+SEsjlHNSzTqWXdiAGv9yZDSeccEtMNbbI+n1cUZrKwcjODOHgzP v00gX3RKu2J4HXXDbYMy61u0NVvEkX4Fka0mML3dDxNbkA9Y/6ZxZ6ip6O/gikX0+c4T v79FAo4M7sUtjKI4ReUeo3ymNJJ2eGNnwydXF3na8r3+k0l6B1J3WcwArvphl5cEj3u5 rV+w== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1723075365; x=1723680165; h=cc:to:in-reply-to:references:message-id:content-transfer-encoding :mime-version:subject:date:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=cVEM398nfKMPG00719+LnI2T0zzUH1B6VC8Z8aO8SnY=; b=kCkZvxQ+SRkDGLRbM7fJ/NpeCLBZdUtLmZnRlmBA4u+1HoUAOFHbBxeuUE+mYoUimq P8DMGKpA9rVgiOmTEdgHOlFFWW1NaHWGnnCLknIlvKn2U1EkKTmBDmNoiG3VUm2hznVs RfMB2jA3XdNRcZgkRrRBerMFDKK04aBpKbQsimD1WPUwNSA0GNOwnANVOj3LRIjvzfoG MbII2kokc3atJhEsUxEqXWz4cC+e+T3Q0ZLGrRqwG1JYUTnhA5c87h1sX24h7fKcG62+ M/QcYb4/7OLgJZNgVHL1dN7Ap+TtT0ULYwaemv5VE4Oh42cCBHt/3zr4GwxY2QlY/2eU E8Iw== X-Forwarded-Encrypted: i=1; AJvYcCWBPfCfrKDhP3kt37VFF9u/xn04f+dkUjkGTP3LtA0IIpOQxoxc25cQWUqQCv2+Tua1JUZ/uHOEUyYf4XLpN5tVii3wQ29QxfDe4qbr X-Gm-Message-State: AOJu0YyZRBks64ocRjng1ge/2xjiSAOqsnk+UOMirBB0MHtSPQn+xSTg 1Fg0NSsVbwGtz07BDhc2KS4PRzFHUAPif7U//os0d4oNYciA2y3HM60QitYttIk= X-Google-Smtp-Source: AGHT+IHNeWL5cfiLNEiUw9iYprrQkJwxXnC1ihODFnCQg2Ve6vzN72yDdaGjq2g1HAKVsa9e7SNefA== X-Received: by 2002:a17:902:e5c1:b0:1fb:2ebc:d17a with SMTP id d9443c01a7336-200959a8eb9mr2828215ad.23.1723075364871; 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-kernel@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