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Thu, 29 Oct 2026 23:15:04 -0500 Message-ID: Date: Fri, 30 Oct 2026 09:45:03 +0530 X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH] perf/amd/ibs: add phy_addr_only software filter for ibs_op To: Huang Shijie CC: , , , , , , , , , , , , , , , , , , , , , , , , , <1537577747@qq.com>, Ravi Bangoria References: <20260902085251.4046240-1-huangsj@hygon.cn> Content-Language: en-US From: Ravi Bangoria In-Reply-To: Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 7bit X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: CY6PEPF0000004D:EE_|BL1PR12MB5777:EE_ X-MS-Office365-Filtering-Correlation-Id: 11cb2e93-b79b-47b3-770d-08df363c67dc X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|36860700016|82310400026|1800799024|376014|7416014|23010399003|10067099003|4143699003|11063799006|6133799003|261028144727099003|261022075727099003|261022105027099003|261021121427099003|261021123027099003|56012099006|261026140227099003|261026121527099003|22082099003|18002099003; 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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: n6W1sWquc/SxmWWhkI/kPnlU5/ByLyfstAdbu2/DUaqPBuTEZCCfLPiZKTEaJEA1C9cxQ+crIcbmVhR7eYpi3Nv14M03+L34Wp2SgAA/JI1AlXSY/qh7bOxTkSncWPnHWkZ68jt86B/NC2r3kGunWgJ0E8iqwxMaxE+eqOkgehl9GUeIw2GFRlpdHStKhJAQY1su3xHklJw2YEemwW3LoZGHtVnqTofLmTYII/9luOQLk9NIYGHUi98O8ZxyIb0PW5uf2980dy8+HbWfVQogIQU1VUjSXL6VaP1sseuu9xgyKb73DlsH+sEP0FrCRdKYIFgs7FTOVNAFKxgFQ6M7cu17hGoaTqsRlwSXUuJnLEsMR7wRHjtUKzlTkXsjuAI1EMXlKnbaeAgxh0AnXB0C6dKFKvIX/MCuNPpdy2mijZ8LXsPFG1hANqEvtq3OfczX X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 30 Oct 2026 04:15:17.7464 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 11cb2e93-b79b-47b3-770d-08df363c67dc 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=[satlexmb07.amd.com] X-MS-Exchange-CrossTenant-AuthSource: CY6PEPF0000004D.namprd03.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: BL1PR12MB5777 Huang, >> Can you please confirm if those additional samples are genuinely valid. > > Yes. > To answer this properly I re-ran the mysql test, > and verified the physical address of every captured sample against > the System RAM ranges in /proc/iomem. > > Setup: 384-CPU Hygon box, v7.3-based kernel, MySQL 8 under sysbench > oltp_read_only, 400 threads. Each round is a fresh 60s > sysbench run; after 15s of warmup, perf records ibs_op for 3s: > > $ perf record -e ibs_op/phy_addr_only=1/ -c 100000 --phys-data \ > -p # my patch > $ perf record -e ibs_op// --phys-data --filter 'phys_addr != 0' \ > -c 100000 -p # your suggestion > > Rounds alternate p1 -> b1 -> p2 -> b2 -> p3 -> b3 so both methods see > the same load conditions. Each record's phys_addr is then dumped with > "perf script -F pid,tid,phys_addr" and bisect-checked against the > System RAM ranges (read from /proc/iomem as root). > > samples phys_addr==0 non-zero in > round filter captured (valid=1,MSR=0) System RAM > ----- -------- --------- --------------- ----------- > p1 phy_only 15710042 0.10 % 98.61 % > b1 bpf 14041851 0.00 % 98.55 % > p2 phy_only 15580497 0.10 % 98.56 % > b2 bpf 15416187 0.00 % 98.58 % > p3 phy_only 15732582 0.10 % 98.59 % > b3 bpf 15447397 0.00 % 98.58 % > > Two observations: > 1. The validity ratio is identical for both methods. Of the non-zero > addresses phy_addr_only delivers, 98.6 % fall inside System RAM -- > the same ratio the BPF-filtered set shows. > > 2. The only set-level difference is 0.10 % of samples where > dc_phy_addr_valid is set but IBSDCPHYSAD reads 0. The BPF filter is giving more accurate data here because neither kernel nor userspace should access the first physical page: $ sudo head -1 /proc/iomem 00000000-00000fff : Reserved Thanks, Ravi