From nobody Fri Dec 19 12:15:19 2025 Received: from mail-pj1-f74.google.com (mail-pj1-f74.google.com [209.85.216.74]) (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 3701817A2F2 for ; Wed, 26 Mar 2025 03:51:10 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.216.74 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1742961072; cv=none; b=kOVGSrZ4E3nRsWDJymoW80EuD6R5n48KYfPKUolsQk6LOQAgzOZeJvXfeaTgYAcd51tDJ2AUruC7D+B6k5paam9wOGsHYKEoqIN0jJwoJOZjS3ok6nalBCMkbW40QuDXnMH6rbNtT5WlTc52umjlg3/HJkx9ROsCL/jUQpyMGos= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1742961072; c=relaxed/simple; bh=6LrIdPRj1HxPT+PbcMIt9Tvx3WbxHdl1wI4+3h2doPs=; h=Date:In-Reply-To:Mime-Version:References:Message-ID:Subject:From: To:Cc:Content-Type; b=PGrH69Sof+mWTNILmLNuHnDgXlvD13rLJiSl/FLeI/8xO+wDC/CXaPVILYCTvwQWs4gl9eUKASoZ8+SR6qdbqEH2+K1yTPrSrAGhoRHC35GfbDkDnVP/yAp6AluXSUzRcpSXf1e+go5H07BPtEY/39iwgfplxTKKc9MzzW2053M= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com; spf=pass smtp.mailfrom=flex--irogers.bounces.google.com; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b=3oSGHeT6; arc=none smtp.client-ip=209.85.216.74 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=flex--irogers.bounces.google.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="3oSGHeT6" Received: by mail-pj1-f74.google.com with SMTP id 98e67ed59e1d1-2ff62f96b10so852359a91.0 for ; Tue, 25 Mar 2025 20:51:10 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1742961070; x=1743565870; darn=vger.kernel.org; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:from:to:cc:subject:date:message-id:reply-to; bh=VDGbOYIOj15E+JsmdSzGj6CuNWcI9S7Zmd8zr8fj0vs=; b=3oSGHeT6Q3St/nECgKitBHqETjUD7jFTqgkoApGJuWI32h58cG9ViRnO9VjG0TVGmV urOTaar1R+cG7dGTzHaM+m+QeP8GdKag+MDSu0Q0NP0do+5dg8wnDs1rgP1dsBx5OZWP mOINAf+pfZ2GIu0y83Wfb9XCxCSgwukrBR+jF1Mmq9diCCEIF5Cq1VrHfwzE/V6Nuy5l LMWqeJgApGmLLsipIwG9nyWHYEDQHQETn8PZzVD7AUEjoGQMMwUioqUZOF4O6cRCfkvB 1vuyWnLtdZM/XjbKogTw8XtC85WanDT8vJ4wieRt4jGWps+WTmyJBP7X9l57RlfJleow MzYg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1742961070; x=1743565870; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=VDGbOYIOj15E+JsmdSzGj6CuNWcI9S7Zmd8zr8fj0vs=; b=hj4xlIgRyk3jvM4LRxW/itTlGM3YUrDWvZUW0jyclGud5o9s5hOwrI/VkrY+ODQkVx vWszU99lQeB7PBQfygQjYtXfTMKD4sXT9Y43NAa0sbccyjVBaRlJVF3vOlzipS5RLMjn NQwwqDPPHMJEBw7K2IZyw0K3q6tw1I7YuYq+nq20sisj98qAKmT4NXXktoJ5e5BYyeF6 LB6CalJ7lSOrLekHKLv9gT44HgTykU4VtzvPkNogEBj2gZlin1sAVmXn9TreCVr+m4bh hgbP23Je8mz8upkewSgX0RulrZUTov5M9Ps2xr7wCJuhD4BjtJ0XNhAf5jGqK9rwVgap 9o/A== X-Forwarded-Encrypted: i=1; AJvYcCVXKziYi9qMoQT1R3xr/ulyW/rJAcWNMv4owktWrBShuVGdR40w6x3ALNgh6XXVJYcofS1saW8OeH7WulM=@vger.kernel.org X-Gm-Message-State: AOJu0Yz0FJsJ2yesOZS1UTvn+Z/YOnA3Gs8R123Nu/JgrfdWlr9qpcrW s+w8CFs85Bfj8N9b6ZmQBj7XdVSAOFMRBf9FPfRuHSTJdaKA4mFmUeAcGjR47BN7P8AJCrS76h2 5ElZfLQ== X-Google-Smtp-Source: AGHT+IGG8kf/JIk38ELOkHk95ox9JB8hK5eqE/sVI+IvZADNpn7vVcFc/26jk3ntBtqUIe/wSk//NLgpdJV8 X-Received: from pgnn25.prod.google.com ([2002:a05:6a02:4f19:b0:af2:2c5c:55e]) (user=irogers job=prod-delivery.src-stubby-dispatcher) by 2002:a05:6a21:32a3:b0:1ee:ba29:d8fa with SMTP id adf61e73a8af0-1fe9380d489mr3594205637.6.1742961070224; Tue, 25 Mar 2025 20:51:10 -0700 (PDT) Date: Tue, 25 Mar 2025 20:50:43 -0700 In-Reply-To: <20250326035045.129440-1-irogers@google.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20250326035045.129440-1-irogers@google.com> X-Mailer: git-send-email 2.49.0.395.g12beb8f557-goog Message-ID: <20250326035045.129440-3-irogers@google.com> Subject: [PATCH v2 2/4] perf parse-events: Avoid scanning PMUs that can't match a wildcard From: Ian Rogers To: Peter Zijlstra , Ingo Molnar , Arnaldo Carvalho de Melo , Namhyung Kim , Mark Rutland , Alexander Shishkin , Jiri Olsa , Ian Rogers , Adrian Hunter , Kan Liang , "Masami Hiramatsu (Google)" , James Clark , Weilin Wang , Dominique Martinet , Thomas Richter , Junhao He , Jean-Philippe Romain , linux-kernel@vger.kernel.org, linux-perf-users@vger.kernel.org Cc: dri-devel@lists.freedesktop.org Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Add perf_pmus__scan_matching_wildcard that only reads sysfs for pmus that could wildcard match. For example, if searching for the event 'inst_retired.any/period=3D1000000/' first 'inst_retired.any' will try to be directly looked up as a PMU, then 'inst_retired.any' will try to be wildcard matched against all PMUs, finally it is assumed 'inst_retired.any' is an event name and opened on all PMUs avoiding reading PMUs that can't have such an event. However, before this patch such a case would read all PMUs for the wildcard matching. Now if the wildcard can't be a hwmon PMU wildcard, reading hwmon PMUs is avoided. On my laptop this reduces 'perf stat -e inst_retired.any true' from performing 253 openat system calls down to 234. Signed-off-by: Ian Rogers --- tools/perf/util/parse-events.c | 26 +++++++++++---------- tools/perf/util/pmus.c | 42 ++++++++++++++++++++++++++++++++++ tools/perf/util/pmus.h | 1 + 3 files changed, 57 insertions(+), 12 deletions(-) diff --git a/tools/perf/util/parse-events.c b/tools/perf/util/parse-events.c index d77af1d24985..19caf1ed9f5d 100644 --- a/tools/perf/util/parse-events.c +++ b/tools/perf/util/parse-events.c @@ -1664,18 +1664,20 @@ int parse_events_multi_pmu_add_or_add_pmu(struct pa= rse_events_state *parse_state =20 pmu =3D NULL; /* Failed to add, try wildcard expansion of event_or_pmu as a PMU name. */ - while ((pmu =3D perf_pmus__scan(pmu)) !=3D NULL) { - if (!parse_events__filter_pmu(parse_state, pmu) && - perf_pmu__wildcard_match(pmu, event_or_pmu)) { - bool auto_merge_stats =3D perf_pmu__auto_merge_stats(pmu); - - if (!parse_events_add_pmu(parse_state, *listp, pmu, - const_parsed_terms, - auto_merge_stats, - /*alternate_hw_config=3D*/PERF_COUNT_HW_MAX)) { - ok++; - parse_state->wild_card_pmus =3D true; - } + while ((pmu =3D perf_pmus__scan_matching_wildcard(pmu, event_or_pmu)) != =3D NULL) { + bool auto_merge_stats; + + if (parse_events__filter_pmu(parse_state, pmu)) + continue; + + auto_merge_stats =3D perf_pmu__auto_merge_stats(pmu); + + if (!parse_events_add_pmu(parse_state, *listp, pmu, + const_parsed_terms, + auto_merge_stats, + /*alternate_hw_config=3D*/PERF_COUNT_HW_MAX)) { + ok++; + parse_state->wild_card_pmus =3D true; } } if (ok) diff --git a/tools/perf/util/pmus.c b/tools/perf/util/pmus.c index f2706c395509..93d5db1c89b4 100644 --- a/tools/perf/util/pmus.c +++ b/tools/perf/util/pmus.c @@ -19,6 +19,7 @@ #include "tool_pmu.h" #include "print-events.h" #include "strbuf.h" +#include "string2.h" =20 /* * core_pmus: A PMU belongs to core_pmus if it's name is "cpu" or it's sy= sfs @@ -385,6 +386,47 @@ struct perf_pmu *perf_pmus__scan_for_event(struct perf= _pmu *pmu, const char *eve return NULL; } =20 +struct perf_pmu *perf_pmus__scan_matching_wildcard(struct perf_pmu *pmu, c= onst char *wildcard) +{ + bool use_core_pmus =3D !pmu || pmu->is_core; + + if (!pmu) { + /* + * Core PMUs, other sysfs PMUs and tool PMU can have any name or + * aren't wother optimizing for. + */ + unsigned int to_read_pmus =3D PERF_TOOL_PMU_TYPE_PE_CORE_MASK | + PERF_TOOL_PMU_TYPE_PE_OTHER_MASK | + PERF_TOOL_PMU_TYPE_TOOL_MASK; + + /* + * Hwmon PMUs have an alias from a sysfs name like hwmon0, + * hwmon1, etc. or have a name of hwmon_. They therefore + * can only have a wildcard match if the wildcard begins with + * "hwmon". + */ + if (strisglob(wildcard) || + (strlen(wildcard) >=3D 5 && strncmp("hwmon", wildcard, 5) =3D=3D 0)) + to_read_pmus |=3D PERF_TOOL_PMU_TYPE_HWMON_MASK; + + pmu_read_sysfs(to_read_pmus); + pmu =3D list_prepare_entry(pmu, &core_pmus, list); + } + if (use_core_pmus) { + list_for_each_entry_continue(pmu, &core_pmus, list) { + if (perf_pmu__wildcard_match(pmu, wildcard)) + return pmu; + } + pmu =3D NULL; + pmu =3D list_prepare_entry(pmu, &other_pmus, list); + } + list_for_each_entry_continue(pmu, &other_pmus, list) { + if (perf_pmu__wildcard_match(pmu, wildcard)) + return pmu; + } + return NULL; +} + static struct perf_pmu *perf_pmus__scan_skip_duplicates(struct perf_pmu *p= mu) { bool use_core_pmus =3D !pmu || pmu->is_core; diff --git a/tools/perf/util/pmus.h b/tools/perf/util/pmus.h index 213ee65306d6..2794d8c3a466 100644 --- a/tools/perf/util/pmus.h +++ b/tools/perf/util/pmus.h @@ -20,6 +20,7 @@ struct perf_pmu *perf_pmus__find_by_type(unsigned int typ= e); struct perf_pmu *perf_pmus__scan(struct perf_pmu *pmu); struct perf_pmu *perf_pmus__scan_core(struct perf_pmu *pmu); struct perf_pmu *perf_pmus__scan_for_event(struct perf_pmu *pmu, const cha= r *event); +struct perf_pmu *perf_pmus__scan_matching_wildcard(struct perf_pmu *pmu, c= onst char *wildcard); =20 const struct perf_pmu *perf_pmus__pmu_for_pmu_filter(const char *str); =20 --=20 2.49.0.395.g12beb8f557-goog