From nobody Thu Apr 2 19:00:04 2026 Received: from mail-dy1-f202.google.com (mail-dy1-f202.google.com [74.125.82.202]) (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 751C930CDAE for ; Thu, 26 Mar 2026 22:44:58 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=74.125.82.202 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1774565099; cv=none; b=dZZbp0dSBMg50aQHzVFO9PR6SIbiSwywh25d1QH2ADuqGl1IwbKYPJg1lK/7GqzMgmnf1YHRnrAMHK8OzocE/Zzy5Uw+QlcRmChxiuRVwYsbI0yALbZgHHqNenhaegw2qVPGoDQYiLSRHhNt1mH/VgNR/bZhaj/tgF1hxxGj67g= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1774565099; c=relaxed/simple; bh=CR6+INWhQ/wPb5pyKdSwqC6q9KSJRF0W12JGLakGgaw=; h=Date:Mime-Version:Message-ID:Subject:From:To:Content-Type; b=leEedkEFj85aIN5VHtUL03gJ43HvXUmw0zK+M/Qd+eS4J8Wb1/5wRn8nmUNBb1yIo8ShXKgu69fzpKm0MkC+Cl8lYRYAu9lUrVbvPpTKnCJjYDdjG5OoapZqzxrt9mc/SztYN6jl4/BiW+3hBvGZpC2FmLq0aQPfAghtrHURZ4Y= 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=FY/khvB3; arc=none smtp.client-ip=74.125.82.202 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="FY/khvB3" Received: by mail-dy1-f202.google.com with SMTP id 5a478bee46e88-2c0bddb9196so1004356eec.1 for ; Thu, 26 Mar 2026 15:44:58 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20251104; t=1774565098; x=1775169898; darn=vger.kernel.org; h=to:from:subject:message-id:mime-version:date:from:to:cc:subject :date:message-id:reply-to; bh=+OJlo7iOn/D+yubhqDazKlqKYdB4rVxpLH9bxft1M0A=; b=FY/khvB3zdUagbJELanU9Xc8ihvuLS82+vM7R68A4j1Arh5D+Rt4ASjPOCd8qdriO2 vCnG0fF6PSMMSSLmbDt4Vg/KsJ57eCmuaA/5lGnZRkW+ukHi5z0rP0fRv1bBgF+PzaFx 5NSvvtW6I97npftDM+6fnKudXm8Z8PGa9QoM7TDeLGOvzSjFzIYoA+T3KKxMo5N67OwP 37qnbJbyGQDUzIYxDVL8hUpyU9lAk7cLZ9pQ/Htkoj1kBoeK2Xgk58siXL3Hj79vjsCq hj/38PlDOW2+9ZsSWNQnM5t9TzG6EoTBkVRI14HGqRPdIOlR6cTwiWSydbC5AizdKaQO 5fbQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1774565098; x=1775169898; h=to:from:subject:message-id:mime-version:date:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=+OJlo7iOn/D+yubhqDazKlqKYdB4rVxpLH9bxft1M0A=; b=PRonCDha2B95njsMeShAv5GHqOOle+T4sg5IZfT+ZzlQ9IkoPvTDI1mB4hIXUN+U8m kQX/ukhOX6uV51t6/41wuwVGXqP6KqEcxJy+sFS3sg8u0nZTt6DQzVDkLUcFMqgMfuLj iY9gWiNk+DNLaOzWWdGBWevi0qUmPsaeWzZ2k++sZbg+5liCtiyLKIV4XGwoSxO5HH1I 3lv/MZW8Yy++3EfZdxb6YJQrr4OPquyLOKdyTXyUXGVG87sIiZXK6hVXLgXfA1i/dK80 6r+hGYtNacK9V0soRv/Hc6nUnrohirm8hwP4jAx+t9drSoTj4qBTzK9iNj0mMFGbR/Hi iMBg== X-Forwarded-Encrypted: i=1; AJvYcCWHjYMfa1tiQHOcMktXHOHhjAc2sqemgMyYIv+T/dZACY+VshtZYWooEL/ctk2DFFB2Ak13BrL1VnZh2jU=@vger.kernel.org X-Gm-Message-State: AOJu0Yx/QOSjmRxfZmMeDCmc4sMBXuOg75QMhY0HBPd7UP9bWJ2Vi3vk UNZftcTOaWwwNiOk9Oaoz/jz65q6ym1gp61P3ZtVW9olGEsYQCXTtx57jn357rHIOQPABl0aXIf fbChRpzG+Hw== X-Received: from dys12.prod.google.com ([2002:a05:693c:800c:b0:2c0:f534:5cae]) (user=irogers job=prod-delivery.src-stubby-dispatcher) by 2002:a05:7301:1010:b0:2c0:e741:9d84 with SMTP id 5a478bee46e88-2c185fadaf8mr186912eec.35.1774565097263; Thu, 26 Mar 2026 15:44:57 -0700 (PDT) Date: Thu, 26 Mar 2026 15:44:54 -0700 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 X-Mailer: git-send-email 2.53.0.1018.g2bb0e51243-goog Message-ID: <20260326224454.2101190-1-irogers@google.com> Subject: [PATCH v1] perf metricgroup: Avoid scanning unnecessary PMUs for identifier match From: Ian Rogers To: Peter Zijlstra , Ingo Molnar , Arnaldo Carvalho de Melo , Namhyung Kim , Alexander Shishkin , Jiri Olsa , Ian Rogers , Adrian Hunter , James Clark , Leo Yan , Thomas Falcon , linux-perf-users@vger.kernel.org, linux-kernel@vger.kernel.org Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Only uncore PMUs can have an identifier, so add an optimized perf_pmus__scan routine for that case to avoid all PMU types being created. Signed-off-by: Ian Rogers Reviewed-by: James Clark --- tools/perf/util/metricgroup.c | 8 ++------ tools/perf/util/pmus.c | 18 +++++++++++++++++- tools/perf/util/pmus.h | 1 + 3 files changed, 20 insertions(+), 7 deletions(-) diff --git a/tools/perf/util/metricgroup.c b/tools/perf/util/metricgroup.c index 7e39d469111b..769b38400832 100644 --- a/tools/perf/util/metricgroup.c +++ b/tools/perf/util/metricgroup.c @@ -410,13 +410,9 @@ static int metricgroup__sys_event_iter(const struct pm= u_metric *pm, if (!pm->metric_expr || !pm->compat) return 0; =20 - while ((pmu =3D perf_pmus__scan(pmu))) { - - if (!pmu->id || !pmu_uncore_identifier_match(pm->compat, pmu->id)) - continue; - + while ((pmu =3D perf_pmus__scan_for_uncore_id(pmu, pm->compat))) return d->fn(pm, table, d->data); - } + return 0; } =20 diff --git a/tools/perf/util/pmus.c b/tools/perf/util/pmus.c index 98be2eb8f1f0..9859d7056fb7 100644 --- a/tools/perf/util/pmus.c +++ b/tools/perf/util/pmus.c @@ -409,7 +409,7 @@ struct perf_pmu *perf_pmus__scan_matching_wildcard(stru= ct perf_pmu *pmu, const c if (!pmu) { /* * Core PMUs, other sysfs PMUs and tool PMU can have any name or - * aren't wother optimizing for. + * aren't worth optimizing for. */ unsigned int to_read_pmus =3D PERF_TOOL_PMU_TYPE_PE_CORE_MASK | PERF_TOOL_PMU_TYPE_PE_OTHER_MASK | @@ -486,6 +486,22 @@ static struct perf_pmu *perf_pmus__scan_skip_duplicate= s(struct perf_pmu *pmu) return NULL; } =20 +struct perf_pmu *perf_pmus__scan_for_uncore_id(struct perf_pmu *pmu, const= char *compat) +{ + if (!pmu) { + /* Only uncore PMUs can have identifiers. */ + unsigned int to_read_pmus =3D PERF_TOOL_PMU_TYPE_PE_OTHER_MASK; + + pmu_read_sysfs(to_read_pmus); + pmu =3D list_prepare_entry(pmu, &other_pmus, list); + } + list_for_each_entry_continue(pmu, &other_pmus, list) { + if (pmu->id && pmu_uncore_identifier_match(compat, pmu->id)) + return pmu; + } + return NULL; +} + const struct perf_pmu *perf_pmus__pmu_for_pmu_filter(const char *str) { struct perf_pmu *pmu =3D NULL; diff --git a/tools/perf/util/pmus.h b/tools/perf/util/pmus.h index 7cb36863711a..0d55edb3f2fc 100644 --- a/tools/perf/util/pmus.h +++ b/tools/perf/util/pmus.h @@ -23,6 +23,7 @@ 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); +struct perf_pmu *perf_pmus__scan_for_uncore_id(struct perf_pmu *pmu, const= char *compat); =20 const struct perf_pmu *perf_pmus__pmu_for_pmu_filter(const char *str); =20 --=20 2.53.0.1018.g2bb0e51243-goog