From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Cyrus-Session-Id: sloti22d1t05-3689844-1523235910-2-9713982777161675603 X-Sieve: CMU Sieve 3.0 X-Spam-known-sender: no X-Spam-score: 0.0 X-Spam-hits: BAYES_00 -1.9, HEADER_FROM_DIFFERENT_DOMAINS 0.25, MAILING_LIST_MULTI -1, RCVD_IN_DNSWL_HI -5, T_RP_MATCHES_RCVD -0.01, LANGUAGES en, BAYES_USED global, SA_VERSION 3.4.0 X-Spam-source: IP='209.132.180.67', Host='vger.kernel.org', Country='US', FromHeader='com', MailFrom='org', XOriginatingCountry='US' X-Spam-charsets: plain='iso-8859-1' X-Resolved-to: greg@kroah.com X-Delivered-to: greg@kroah.com X-Mail-from: stable-owner@vger.kernel.org ARC-Seal: i=1; a=rsa-sha256; cv=none; d=messagingengine.com; s=fm2; t= 1523235910; b=GsthsnuYN9l//mmxB1FNFCIyL8tpN/b9pg8uJ/G+PnE7irUyF+ XdbHb8db4dGaYdH7dMDBGqcSeZyqdIh5oYmRUBYKniLvXQ3QnWNkMUWzHvtLhnbD zAJDGMUw0GfRt6RI3TAZcHIFXClOqyzaA9bC08KnRl1OOLzsZtmUyqt7YZ1VuiLE 0FQFPQckebUBg57XILdb51dDPT/wlkUWveLHw7M5Kj+ubAgfJCSRq/2+AfBhSB1f 56E0pTXI/Re/R3wxM3ClG9ooFJ1Ul7R/U7+ZuicPxrxVClX2w2pG2Qqn/KUU6cRj xuJfRqt9qYFInQKPgpKcrBsFA7sHccS5wpwg== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d= messagingengine.com; h=from:to:cc:subject:date:message-id :references:in-reply-to:content-type:content-transfer-encoding :mime-version:sender:list-id; s=fm2; t=1523235910; bh=dLtJFyf+w0 1nfZJtFR3Z6JvlKuaQq8MFiFAviKdQTgc=; b=nohd1Rzh/wpcdhbkMC9di/1eVE wN9NABVJK+WjYNMwLkgGN101tIABF+rSDeUhfQcffQJWPP9B67f/vu4SQ8ECiMFg 3Y/rCle1C+IsJgaEEkymlmak/RVcFcZG8xaGd2jBwPUwv7F5bGBKlhlY6Q6DfPhj 1PQ2YoG/6qhbK7keHmAOtxVWv5FGdZDchLu6OAHrYxuCORP3j69Al1cu77FDnznB LL+1OCDZaWsai2OmIq9OM2RiQecEUrbC09N61kerQZuIy+MFDG9GdfflkmyWZ0/I aheE3GrgKGXpNFgdUB7EOjDOqO29KvskBaef5n0YQNxXgQ9ZSwpLwiZ9F4Ew== ARC-Authentication-Results: i=1; mx2.messagingengine.com; arc=none (no signatures found); dkim=pass (1024-bit rsa key sha256) header.d=microsoft.com header.i=@microsoft.com header.b=WyqbHR5e x-bits=1024 x-keytype=rsa x-algorithm=sha256 x-selector=selector1; dmarc=pass (p=reject,has-list-id=yes,d=none) header.from=microsoft.com; iprev=pass policy.iprev=209.132.180.67 (vger.kernel.org); spf=none smtp.mailfrom=stable-owner@vger.kernel.org smtp.helo=vger.kernel.org; x-aligned-from=fail; x-cm=none score=0; x-ptr=pass x-ptr-helo=vger.kernel.org x-ptr-lookup=vger.kernel.org; x-return-mx=pass smtp.domain=vger.kernel.org smtp.result=pass smtp_org.domain=kernel.org smtp_org.result=pass smtp_is_org_domain=no header.domain=microsoft.com header.result=pass header_is_org_domain=yes; x-vs=clean score=-100 state=0 Authentication-Results: mx2.messagingengine.com; arc=none (no signatures found); dkim=pass (1024-bit rsa key sha256) header.d=microsoft.com header.i=@microsoft.com header.b=WyqbHR5e x-bits=1024 x-keytype=rsa x-algorithm=sha256 x-selector=selector1; dmarc=pass (p=reject,has-list-id=yes,d=none) header.from=microsoft.com; iprev=pass policy.iprev=209.132.180.67 (vger.kernel.org); spf=none smtp.mailfrom=stable-owner@vger.kernel.org smtp.helo=vger.kernel.org; x-aligned-from=fail; x-cm=none score=0; x-ptr=pass x-ptr-helo=vger.kernel.org x-ptr-lookup=vger.kernel.org; x-return-mx=pass smtp.domain=vger.kernel.org smtp.result=pass smtp_org.domain=kernel.org smtp_org.result=pass smtp_is_org_domain=no header.domain=microsoft.com header.result=pass header_is_org_domain=yes; x-vs=clean score=-100 state=0 X-ME-VSCategory: clean X-CM-Envelope: MS4wfCuN0cYt3Ndg2ISxUDlE8kd/cjAMYDCz76iyzZX2Z1KVIPEKU8fTAarE1fjDahDaEhyAFjjpr/T/ZjRhDvVQ7NZjp4rYzL06E+xfQFntB31DpuTprRzu tMKu/+Mw1pZpPPoy4WvIK1OgmfEHYGCl2ZEaBeyOB+iejgMDYFejElx6J0X9zPM+M9oeYxM8CGDIGVnq+2jC1DtGBsMFp6M/8FQaI7AZRurJyNOHUPkpaOda X-CM-Analysis: v=2.3 cv=E8HjW5Vl c=1 sm=1 tr=0 a=UK1r566ZdBxH71SXbqIOeA==:117 a=UK1r566ZdBxH71SXbqIOeA==:17 a=wRwT6uffUbIA:10 a=t_PdEiP4ckcA:10 a=mw6kJ3eo-EIA:10 a=8nJEP1OIZ-IA:10 a=xqWC_Br6kY4A:10 a=Kd1tUaAdevIA:10 a=Lf-vpJhqX20A:10 a=JfrnYn6hAAAA:8 a=QyXUC8HyAAAA:8 a=VwQbUJbxAAAA:8 a=Z4Rwk6OoAAAA:8 a=1XWaLZrsAAAA:8 a=TiaNW0bfAAAA:8 a=WsHKUha7AAAA:8 a=yMhMjlubAAAA:8 a=HwfIkp-pSQ9a9caPooYA:9 a=wPNLvfGTeEIA:10 a=1CNFftbPRP8L7MoqJWF3:22 a=AjGcO6oz07-iQ99wixmX:22 a=HkZW87K1Qel5hWWM3VKY:22 a=AEymbdFwRXaGbywpKsZu:22 a=H4LAKuo8djmI0KOkngUh:22 X-ME-CMScore: 0 X-ME-CMCategory: none Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755113AbeDIBEy (ORCPT ); Sun, 8 Apr 2018 21:04:54 -0400 Received: from mail-co1nam03on0103.outbound.protection.outlook.com ([104.47.40.103]:45124 "EHLO NAM03-CO1-obe.outbound.protection.outlook.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S933135AbeDIAjd (ORCPT ); Sun, 8 Apr 2018 20:39:33 -0400 From: Sasha Levin To: "stable@vger.kernel.org" , "linux-kernel@vger.kernel.org" CC: Peter Zijlstra , Alexander Shishkin , Arnaldo Carvalho de Melo , Jiri Olsa , Linus Torvalds , Stephane Eranian , Thomas Gleixner , Vince Weaver , Ingo Molnar , Sasha Levin Subject: [PATCH AUTOSEL for 3.18 003/101] perf/core: Correct event creation with PERF_FORMAT_GROUP Thread-Topic: [PATCH AUTOSEL for 3.18 003/101] perf/core: Correct event creation with PERF_FORMAT_GROUP Thread-Index: AQHTz5qeO/p7bIJR+UWThHJICiU0Ig== Date: Mon, 9 Apr 2018 00:35:11 +0000 Message-ID: <20180409003505.164715-3-alexander.levin@microsoft.com> References: <20180409003505.164715-1-alexander.levin@microsoft.com> In-Reply-To: <20180409003505.164715-1-alexander.levin@microsoft.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [52.168.54.252] x-ms-publictraffictype: Email x-microsoft-exchange-diagnostics: 1;DM5PR2101MB1047;7:qz3wXUTQY6N+nr0kspM1xzPRLYUG7SVL/1NA6Tt76aB9Z/PH5HzS4qoNp2UckLi+dd9ExMPE5+NdMaGbr2Zb8fufNXOA0IqanQ2JsQ7l7pIbJu7wOLQ0pXcYxwUl1T2kVqFFmOFUJtxPISCVcakNTKQfe9MJdMDVRF7NQLq08AB7DKAheID0vCi7vBQfhzPAIUe4uphPDmimywrgBtVpDeQHs70msP9HUS1RNUmn5FkakACIdOfw6VVMdDFouneX;20:2CCUh3dFThIi8LID+OXyQy08NPWIXn+k2gYGYc86FP/PwP7O6/iWzMs5WXMfgAtDTpVIxGtLhLcf1KGICQS0O+EMAHHSqL9uTxLRiJFIo5Anj1uXBm92uVg6MhQb5MD2YCXTNy7wRo4URVJqQl0+kTJDED76ljMapIq9i1BmSNA= x-ms-office365-filtering-ht: Tenant X-MS-Office365-Filtering-Correlation-Id: 1b9b69a7-60ae-4f20-4e39-08d59db258bc x-microsoft-antispam: UriScan:;BCL:0;PCL:0;RULEID:(7020095)(4652020)(48565401081)(5600026)(4604075)(3008032)(4534165)(4627221)(201703031133081)(201702281549075)(2017052603328)(7193020);SRVR:DM5PR2101MB1047; x-ms-traffictypediagnostic: DM5PR2101MB1047: authentication-results: spf=none (sender IP is ) smtp.mailfrom=Alexander.Levin@microsoft.com; x-microsoft-antispam-prvs: x-exchange-antispam-report-test: UriScan:(28532068793085)(89211679590171)(211936372134217)(42068640409301)(153496737603132)(228905959029699); x-exchange-antispam-report-cfa-test: BCL:0;PCL:0;RULEID:(8211001083)(61425038)(6040522)(2401047)(8121501046)(5005006)(93006095)(93001095)(3231221)(944501327)(52105095)(3002001)(10201501046)(6055026)(61426038)(61427038)(6041310)(20161123562045)(201703131423095)(201702281528075)(20161123555045)(201703061421075)(201703061406153)(20161123558120)(20161123564045)(20161123560045)(6072148)(201708071742011);SRVR:DM5PR2101MB1047;BCL:0;PCL:0;RULEID:;SRVR:DM5PR2101MB1047; x-forefront-prvs: 0637FCE711 x-forefront-antispam-report: SFV:NSPM;SFS:(10019020)(376002)(396003)(366004)(39860400002)(346002)(39380400002)(189003)(199004)(97736004)(3660700001)(2900100001)(2906002)(8936002)(11346002)(3280700002)(106356001)(446003)(68736007)(72206003)(1076002)(966005)(86612001)(25786009)(3846002)(36756003)(107886003)(6116002)(81166006)(4326008)(486006)(81156014)(6306002)(6512007)(6436002)(53936002)(14454004)(8676002)(26005)(5250100002)(86362001)(105586002)(6666003)(305945005)(186003)(10290500003)(7736002)(10090500001)(102836004)(6486002)(2616005)(5660300001)(316002)(2501003)(66066001)(22452003)(54906003)(99286004)(110136005)(478600001)(476003)(7416002)(76176011)(6506007)(22906009)(21314002)(217873001);DIR:OUT;SFP:1102;SCL:1;SRVR:DM5PR2101MB1047;H:DM5PR2101MB1032.namprd21.prod.outlook.com;FPR:;SPF:None;LANG:en;PTR:InfoNoRecords;MX:1;A:1; x-microsoft-antispam-message-info: kG5aCdbDRFuBxyNG1L1bDtq8Fk8oz/2+Q28bskNov2ItJ1/jCNApdg89Y21MpDOCRLubeF0wu1n6Ua8rtMP8+6TqkjM3CsA5TKO1eTaNWSzWZ9QTd4lia7kLe9ncHxee6Foo7xeVXmdkjUo9/2XhbXlCute6pTvPnA9PIXSZsOsx7uF0aRu08y8UljxfBk+sicb4G/Lk1FlSnBYrBz7bRlh2Y43xF7VGVlJ1tKOU3Wo/8v4W5pO0woO/T8cDyNBDWWUiLmTw/qZ3QId+Dcn1xYiSRhAarWQLV4QVZlld577cPuRbM/LYQk47izq1161keVf70xoBstakWmOz3pB7Uy04J5IiV3ECqW89BzJGfkqQSzoAHEZDwN3ABMflCn3zbH9AoxN6S0t1830SOnUSpk0HoeULqHYU8BR7K25Hjyw= spamdiagnosticoutput: 1:99 spamdiagnosticmetadata: NSPM Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: microsoft.com X-MS-Exchange-CrossTenant-Network-Message-Id: 1b9b69a7-60ae-4f20-4e39-08d59db258bc X-MS-Exchange-CrossTenant-originalarrivaltime: 09 Apr 2018 00:35:11.8299 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 72f988bf-86f1-41af-91ab-2d7cd011db47 X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM5PR2101MB1047 Sender: stable-owner@vger.kernel.org X-Mailing-List: stable@vger.kernel.org X-getmail-retrieved-from-mailbox: INBOX X-Mailing-List: linux-kernel@vger.kernel.org List-ID: From: Peter Zijlstra [ Upstream commit ba5213ae6b88fb170c4771fef6553f759c7d8cdd ] Andi was asking about PERF_FORMAT_GROUP vs inherited events, which led to the discovery of a bug from commit: 3dab77fb1bf8 ("perf: Rework/fix the whole read vs group stuff") - PERF_SAMPLE_GROUP =3D 1U << 4, + PERF_SAMPLE_READ =3D 1U << 4, - if (attr->inherit && (attr->sample_type & PERF_SAMPLE_GROUP)) + if (attr->inherit && (attr->read_format & PERF_FORMAT_GROUP)) is a clear fail :/ While this changes user visible behaviour; it was previously possible to create an inherited event with PERF_SAMPLE_READ; this is deemed acceptible because its results were always incorrect. Reported-by: Andi Kleen Signed-off-by: Peter Zijlstra (Intel) Cc: Alexander Shishkin Cc: Arnaldo Carvalho de Melo Cc: Jiri Olsa Cc: Linus Torvalds Cc: Peter Zijlstra Cc: Stephane Eranian Cc: Thomas Gleixner Cc: Vince Weaver Fixes: 3dab77fb1bf8 ("perf: Rework/fix the whole read vs group stuff") Link: http://lkml.kernel.org/r/20170530094512.dy2nljns2uq7qa3j@hirez.progra= mming.kicks-ass.net Signed-off-by: Ingo Molnar Signed-off-by: Sasha Levin --- kernel/events/core.c | 15 ++++++++++----- 1 file changed, 10 insertions(+), 5 deletions(-) diff --git a/kernel/events/core.c b/kernel/events/core.c index de3303aab7d6..9eb7710914fb 100644 --- a/kernel/events/core.c +++ b/kernel/events/core.c @@ -4861,9 +4861,6 @@ static void perf_output_read_one(struct perf_output_h= andle *handle, __output_copy(handle, values, n * sizeof(u64)); } =20 -/* - * XXX PERF_FORMAT_GROUP vs inherited events seems difficult. - */ static void perf_output_read_group(struct perf_output_handle *handle, struct perf_event *event, u64 enabled, u64 running) @@ -4908,6 +4905,13 @@ static void perf_output_read_group(struct perf_outpu= t_handle *handle, #define PERF_FORMAT_TOTAL_TIMES (PERF_FORMAT_TOTAL_TIME_ENABLED|\ PERF_FORMAT_TOTAL_TIME_RUNNING) =20 +/* + * XXX PERF_SAMPLE_READ vs inherited events seems difficult. + * + * The problem is that its both hard and excessively expensive to iterate = the + * child list, not to mention that its impossible to IPI the children runn= ing + * on another CPU, from interrupt/NMI context. + */ static void perf_output_read(struct perf_output_handle *handle, struct perf_event *event) { @@ -7194,9 +7198,10 @@ perf_event_alloc(struct perf_event_attr *attr, int c= pu, local64_set(&hwc->period_left, hwc->sample_period); =20 /* - * we currently do not support PERF_FORMAT_GROUP on inherited events + * We currently do not support PERF_SAMPLE_READ on inherited events. + * See perf_output_read(). */ - if (attr->inherit && (attr->read_format & PERF_FORMAT_GROUP)) + if (attr->inherit && (attr->sample_type & PERF_SAMPLE_READ)) goto err_ns; =20 pmu =3D perf_init_event(event); --=20 2.15.1