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Thu, 24 Sep 2026 23:02:43 -0500 Message-ID: <76ef085b-e8e3-41a5-b029-2cd0489aa430@amd.com> Date: Fri, 25 Sep 2026 09:32:42 +0530 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v4 6/6] perf mem record: Use the IBS swfilt filter when available To: Arnaldo Carvalho de Melo , Namhyung Kim CC: Ingo Molnar , Thomas Gleixner , James Clark , Jiri Olsa , "Ian Rogers" , Adrian Hunter , "Clark Williams" , , , Arnaldo Carvalho de Melo , Ravi Bangoria References: <20260924212809.1733663-1-acme@kernel.org> <20260924212809.1733663-7-acme@kernel.org> Content-Language: en-US From: Ravi Bangoria In-Reply-To: <20260924212809.1733663-7-acme@kernel.org> Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 7bit X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: BN3PEPF00022BD7:EE_|PH7PR12MB7819:EE_ X-MS-Office365-Filtering-Correlation-Id: 4ce4231d-a157-41cc-7835-08df1ab9fb44 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|82310400026|1800799024|36860700016|376014|7416014|23010399003|6133799003|18092099006|18002099003|22082099003|11063799006|56012099006|10067099003|4143699003; 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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: E+GVqz9qaoT4LWUPq6VktxPTNY61cDmX0IBPm3qNpKUzSZyAOjA6+UEFiGVMyVIRlENZ7RmoiRw3ssScRT9bk04Tv7afdRdBgt6mPTLAMoOUw+FY1EREb1wvet9c7hzNtKL5B+afe3/Q8Iz5u74CdTkz6dcdaNh8dhQuP509CZ3jFlU1fnZ5QTmtsIIdq/pmXE1tp0gDQzYZsQfAUl/w5FWUviSmKt+BI7EbKze/GXOwmO5f3g7tqShRO7G7usPhc82LgaOuXfwr3TEgtDDOegvuL8ssl2WZ61rDVJTYRHxqso4VoQ6QnEChlmRYOZ00ZY939IhgzRKTR2uKJ3cQpZO7/Hwg5sRTbBCKPjxgNwkbo1oQmOg7VmKeolNxdh01ltr+1C1Zg4DK7/Yu0UvOmMyz/+Jgd4zgM9eg0NBgiX+Jm6Vz/9xes3AYilmc7Gbb X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 25 Sep 2026 04:03:39.6351 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 4ce4231d-a157-41cc-7835-08df1ab9fb44 X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=3dd8961f-e488-4e60-8e11-a82d994e183d;Ip=[165.204.84.17];Helo=[satlexmb08.amd.com] X-MS-Exchange-CrossTenant-AuthSource: BN3PEPF00022BD7.namprd03.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: PH7PR12MB7819 Hi Arnaldo, > IBS events with exclude_{user,kernel} bits, as used for per-thread > recording when kernel samples are not allowed, are rejected on hardware > without the privilege filter, so per-thread 'perf mem record' fails on > AMD: > > $ perf mem record -o /dev/null -- true > Failure to open event 'ibs_op/ldlat=0/u' on PMU 'ibs_op' which will be removed. > > Kernel v6.14 added swfilt, a software privilege filter exposed as the > 'swfilt' format term, making those events usable per-thread. Give the > ibs_op memory events extra tables with the term, selected in > perf_pmu__arch_init() when the PMU exposes it, keeping the names that > need system wide mode otherwise; the knowledge that IBS needs this > stays in the arch code. > > Suggested-by: Namhyung Kim > Suggested-by: Ravi Bangoria > Assisted-by: LLM > Signed-off-by: Arnaldo Carvalho de Melo Reviewed-by: Ravi Bangoria > + * ... Keep it even when > + * the event has no exclude bits yet, 'perf record' adds them on the > + * first open failure and retries with the same name. Currently, 'perf record' fails rather than silently retrying with /swfilt=1/. The reason to not transparently add /swfilt=1/ is to make the user aware that software filtering is being used, and it is not overhead free. Thanks, Ravi