From nobody Mon Oct 6 11:53:56 2025 Received: from mail-pj1-f73.google.com (mail-pj1-f73.google.com [209.85.216.73]) (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 C38EDB640 for ; Tue, 22 Jul 2025 01:34:54 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.216.73 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1753148096; cv=none; b=eQOMhf6joOu7ARSTtVknzNA6yha2xHPE9Jm+QICkIPB24fkOvt3vmeLVdqDi8tgiaZ6HHRspOrZz7d2c1fBfxn64IxtE0Vt1hTIjkdug8s/xP5yToNVayeUbGoIClYVaWn6G29nzXIYxhFnh3bXjWpYQ/6YBms0aacOHP2FKtdw= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1753148096; c=relaxed/simple; bh=ml+CruI2TrPMvJL6Ve9QrgFk1hQk6xyzgZpDd4Hsx9k=; h=Date:Mime-Version:Message-ID:Subject:From:To:Content-Type; b=NNCuI1MHEd4nUkXUFgBpOIJfFCB8Qvz0dQd3Og4kY3i8TbhJvhgCKdZ/95UFu+FvmDYw5zKWVWMyu2jNhHGfxrUOuBLvtuq5758IUHtfoJYFRnvQNxv7NYIaCj8oVBnmoiZuAZJYqlK53X/RXUXtA++FvZxU4pYfbBVAaMpJ6nE= 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=MvlcyMGk; arc=none smtp.client-ip=209.85.216.73 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="MvlcyMGk" Received: by mail-pj1-f73.google.com with SMTP id 98e67ed59e1d1-311ef4fb5fdso5767908a91.1 for ; Mon, 21 Jul 2025 18:34:54 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1753148094; x=1753752894; darn=vger.kernel.org; h=to:from:subject:message-id:mime-version:date:from:to:cc:subject :date:message-id:reply-to; bh=QX1c9/Mh/EGaQrrI9AS/O0cONZegTS8Gy7pO7vmBK3s=; b=MvlcyMGkvguZyE/HX2S3tFptEZmfdf6um0/FPqZHi8UMivcsnUEi554qlrqwNVihUA xuZE15yOrxj6NGIcNs8E2aZtIPeH/PZeAKyUECUZMiV6+GCqt+uNIMqvNfqZjKGr9zcd yfDAknww3QNBPAXAalZr5TdhZM3DzPPfbOVgHbvmUMAuOPQYzqAtR6qyY2Yo8CUW5KUi 8J7FcJiY9tZMmI/8Y32oEUWXFDIW3eKfHVp6jcEnEw5u8iMtN0stAJVb9EscxiNqSrJ1 E9SNUROma8V0OcmmFYMocQQRRNN33B+CtT8T5kZgu8Tgqv7QFmtXT59hzr2ZAqWbiYfF BAVQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1753148094; x=1753752894; h=to:from:subject:message-id:mime-version:date:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=QX1c9/Mh/EGaQrrI9AS/O0cONZegTS8Gy7pO7vmBK3s=; b=W05PpF02H6tswGERnn7utVEE6w3kWdkgIQIKg+5J70i1BnDB5bG//D54xiNKmcqDx0 58Vw7QWMbB9wmeIOvYcxAFojBJXvdurWrA5m0xqh8j6MZGXutqfMv2sw4DT53/jZpPC9 5u2dAzuDhRe4GtVXWCWm14HtkkEIp+Qpi14JBg/G4StvzKswXyH0PA/rtAdQIekIYULp EF+FhLUL46K4CUloP/xRgnw3P+UYvRcSTBTlsH7eRmV7vhM429J2DRiwuhVbcU7XKIxu xmO0gTknVqHxiFJ13WUN6O9+zFavE0MSEnSFA/KVpn6bLBPirV6nmhW1hLWDsy8dvtme GuTA== X-Forwarded-Encrypted: i=1; AJvYcCVEchDv/mydaoWWvtsiMysXy9TN1wadfkqf5T1QOntTCVcMxS4Z8oZNoDQ1L75sHnstnNEPiaA9lFSRG1E=@vger.kernel.org X-Gm-Message-State: AOJu0YyrLg7+5T8xe8b2bM9r3DX4emJDmR55uNqxn88gCx15squF2lh1 IO/wA3l0phW4pvJnjT10R04P0hSkD7VY+7YLw36Rj/4AZsQSzXj6spNlYa4FdC/gaTkV7UgkrNe diLRN94dxvw== X-Google-Smtp-Source: AGHT+IFuiYRn2c2rkf0K51zFEPQoIVUZo3CfbVzecU8nFOP9As6coBCa/SJWHmxy0MbELM4WWmNrSHBrySJ6 X-Received: from pjuj4.prod.google.com ([2002:a17:90a:d004:b0:313:242b:1773]) (user=irogers job=prod-delivery.src-stubby-dispatcher) by 2002:a17:90b:5281:b0:310:8d4a:a246 with SMTP id 98e67ed59e1d1-31c9e6e515cmr29689084a91.1.1753148093986; Mon, 21 Jul 2025 18:34:53 -0700 (PDT) Date: Mon, 21 Jul 2025 18:34:49 -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 2.50.0.727.gbf7dc18ff4-goog Message-ID: <20250722013449.146233-1-irogers@google.com> Subject: [PATCH v1] perf pfm: Don't force loading of all PMUs 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 , Jean-Philippe Romain , linux-perf-users@vger.kernel.org, linux-kernel@vger.kernel.org Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Force loading all PMUs adds significant cost because DRM and other PMUs are loaded, it should also not be required if the pmus__ functions are used. Tested by run perf test, in particular the pfm related tests. Also `perf list` is identical before and after. Signed-off-by: Ian Rogers Tested-by: Namhyung Kim --- tools/perf/util/pfm.c | 4 ---- 1 file changed, 4 deletions(-) diff --git a/tools/perf/util/pfm.c b/tools/perf/util/pfm.c index 0dacc133ed39..e89395814e88 100644 --- a/tools/perf/util/pfm.c +++ b/tools/perf/util/pfm.c @@ -47,10 +47,6 @@ int parse_libpfm_events_option(const struct option *opt,= const char *str, p_orig =3D p =3D strdup(str); if (!p) return -1; - /* - * force loading of the PMU list - */ - perf_pmus__scan(NULL); =20 for (q =3D p; strsep(&p, ",{}"); q =3D p) { sep =3D p ? str + (p - p_orig - 1) : ""; --=20 2.50.0.727.gbf7dc18ff4-goog