From nobody Sun Feb 8 18:49:32 2026 Received: from mail-pg1-f202.google.com (mail-pg1-f202.google.com [209.85.215.202]) (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 4E5911F4604 for ; Thu, 3 Apr 2025 20:24:53 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.215.202 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1743711895; cv=none; b=RfjK3vNtv2FjcZK+6ix/2LezYD2gDc78P7SunKL4IZcJWYkZ421vo41AeZ6foxmxzvFxRL+K+TD+4JfKAucmYxr2lB6srIaM+2g9KDxCm6+7SBaZ3OFRcpaZVOijPs2KmEa2M3e33fZOoi/cHTmTZqh0m9h37TRdGHxa5SQhiKE= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1743711895; c=relaxed/simple; bh=90KggfginsQzDP95X+k629D/YxTbuK86i9pbsXIr3+g=; h=Date:In-Reply-To:Mime-Version:References:Message-ID:Subject:From: To:Cc:Content-Type; b=WWcBLjC9Tb/bzlZ63LJiJ5DtnoBu5qoHEQsbIBUNrYNPktFo6Q+tnEBp6u8Py79XCUhRI3646rb32hEkc7y/NbkWMOpQPu60AHykGVjehRDm4Z0Dhbl3/6Th+mJ4jK+N5r7M21DYucmrjFwc0JKewsCSGobnaYIVjllly1UvgUk= 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=1W7TrG0h; arc=none smtp.client-ip=209.85.215.202 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="1W7TrG0h" Received: by mail-pg1-f202.google.com with SMTP id 41be03b00d2f7-af8e645a1d1so844714a12.3 for ; Thu, 03 Apr 2025 13:24:53 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1743711892; x=1744316692; 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=Tilk3aFHymzdwH/49hi2NVgSsKIEgE1zvVteMHXS+8s=; b=1W7TrG0h2Ybjmbv94SZ9gSNLTeJLlOKtUKpm9w+Luj5BLFNpi54oITOSqXZtqEUxlI RoWjM++Y7OiqVcRVQLXyeABQrDc9ECgKZCLLw+EQtrbLXlBa4BMhSe4JEFRfHY8MA/xE JFFo7TeWV99Z6FQItNNWm8lHB/cCNKDXsGP+f/Pw1f021YDvvTl1k/sE9FTdHbCQHGDc CGoxIA+YQ8DzGqRq77qFO3CDTLKqMSCSao/nE+hkolbydgEU8Z5EpKj1L6aeVJzkEZuV qshUivyCPBL7JmaiRne9yF+iU1xqYNVDC4awwyKZcDHpGd2/Xqsy7ESlKGCZ3g28x4Ed Iz/A== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1743711892; x=1744316692; 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=Tilk3aFHymzdwH/49hi2NVgSsKIEgE1zvVteMHXS+8s=; b=u3MaPtB9Gp29gdvwxxqKqgey2aLNpGb5Chl38/O3WS+vtOqZOfRdXfKAgXjtPKB4i/ KGNaxV7bR0m8z9/JEZHKBNkUaG4kq09sR+NqeCoSbkeCgo1DDoHmaGRtC+NGwkSkRmr6 OSo/ZFsYliHnXVfNUEIIiBKH6uf5IlW6ft2dcYK0jcFjZHkn7Z5n4nX7zhrJQaXBWS7I bSAoUQRmkTcHQz+PeP5uN9SpGCu+4DFNB1mszsRXuK2Bcoo56FBaESIxc400+nZM3w8p AqdtBIU7Tbgp7tY5Y61HIDsQvvs5FcHaq7ZdPvBOOB6wAY7T1oCiYNFB8qB/FMmw6zHe b60Q== X-Forwarded-Encrypted: i=1; AJvYcCXMypAoGbtoKtXnCZzT5Kygt4TCWgqWoERZhIDvMgvJ8xEqxHVipFMhI006YUU7ZYRAX+h1zd0UDFVlFW4=@vger.kernel.org X-Gm-Message-State: AOJu0YzzGeUefnz1PVZEivWTL9yJ1IgCb9/KBzX77H7OalHFUb8NRiVp NWsMjluA4WcAC1GEHrrch5vecplnG6ttwXbHREW0xaWrGeYJs105u1Ll1B2puRUW87HT/7J9UAA IoR8Oxw== X-Google-Smtp-Source: AGHT+IEryC+x1Td+fTmPyBksTzhsJltkWaZNz7ZcV3ft48rRChAcFSC8nQC73Hy3G/qeYPy+qRrlXc4bl5d8 X-Received: from pjbqn7.prod.google.com ([2002:a17:90b:3d47:b0:2ff:5f6a:835c]) (user=irogers job=prod-delivery.src-stubby-dispatcher) by 2002:a17:90b:514e:b0:304:ec28:4437 with SMTP id 98e67ed59e1d1-306a4b70e72mr996487a91.22.1743711892605; Thu, 03 Apr 2025 13:24:52 -0700 (PDT) Date: Thu, 3 Apr 2025 13:24:37 -0700 In-Reply-To: <20250403202439.57791-1-irogers@google.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20250403202439.57791-1-irogers@google.com> X-Mailer: git-send-email 2.49.0.504.g3bcea36a83-goog Message-ID: <20250403202439.57791-3-irogers@google.com> Subject: [PATCH v3 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 2.49.0.504.g3bcea36a83-goog