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Shenoy" , "Swapnil Sapkal" , Shrikanth Hegde , "K Prateek Nayak" Subject: [RFC PATCH 12/08] sched/fair: Record the cpu that updated the stats last Date: Sun, 16 Mar 2025 10:29:13 +0000 Message-ID: <20250316102916.10614-4-kprateek.nayak@amd.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20250313093746.6760-1-kprateek.nayak@amd.com> References: <20250313093746.6760-1-kprateek.nayak@amd.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-ClientProxiedBy: SATLEXMB03.amd.com (10.181.40.144) To SATLEXMB04.amd.com (10.181.40.145) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: BL02EPF00021F6E:EE_|SA0PR12MB7075:EE_ X-MS-Office365-Filtering-Correlation-Id: 4be81098-cc18-4792-292d-08dd6475936e X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|1800799024|36860700013|82310400026|7416014|376014; X-Microsoft-Antispam-Message-Info: =?us-ascii?Q?Aj7u/S6xDSZ/OyBYGGGLo2cOrk4hAndloKzIpRdmKldFQG2awPPto7W3oXKv?= =?us-ascii?Q?VGgjGTSscDKpSXE3XpmxPHxy4Ir52C8mmGCLQEU5vidita4MI2BFy30lbaHV?= =?us-ascii?Q?bCRkDpKeRRwgrlGyQIghyXFJzikX6rSO581q+wNPfYyMwxfoENGmtqFp0Jlm?= =?us-ascii?Q?5lrXwEsp0Z5phw1OGof5MHSM9aOz7igsqoUW871cQVnt/bhojpsZ14Z+JJY/?= =?us-ascii?Q?q9Z9VEKp8Blo2WBjzpNhWJD4h631pk8cFtTLTOf0IUjYY3mocbXkPF8hQT1d?= =?us-ascii?Q?r/t+lS5P3/4Vqb1D0hrMUPvNfRufE2R5gkLzHECD0oug8rk6KKseGCdKnRil?= =?us-ascii?Q?720IxvQtTAKa7Rfq6ho5vHTLU3SgtjAw31b9sNjQV49TAGtX1fvsJx8Y+RH4?= =?us-ascii?Q?DvWBlyoQsxmlB++dKx6EbrxmJp1rgXIJkZXBkXHIqERBPqtxVmgLoNURW/Aq?= =?us-ascii?Q?5AUG4pqRlgQOxk66imqOlpbuMj0uRC2OW7WoMz6l6wHy8HR3MjpK/9LISL5/?= =?us-ascii?Q?agfOJcIKsMwHQMpt3Yp1n0ImPDV9ImtKQmYBLiWAwcyB5rNTTjEndNK0j70y?= =?us-ascii?Q?NyJ1rvIorLmGynpx7udur3RVPSrbIuhOsZlikJZ0NnN7PpRC3Xevy1DX0hkx?= =?us-ascii?Q?7q76SNuRwVfciIPoUm+aiYMH9T8iHmxgkcDWCAsE5xaAd5nLfOrokzpOzOQG?= =?us-ascii?Q?rj5hPrLK6SEaUGXzdANPLbdeAXhYf2e0rREc4nDVUMUFBf06SvoNaT/wKJsy?= =?us-ascii?Q?d1Zg/yzxSEKpvtB6s4EkPb0rIPQwNUVs1fhPyzwznb028pyURXxfez4izwZH?= =?us-ascii?Q?wIUqAnXdQ8kx2bQKt5zxrQCPRlhElwXHdkaOjqJp/UPWGG7rnPkINJYDdOGK?= =?us-ascii?Q?gvJydkCu/jjtNEHG3h7zA9HKOhIHHNQ60SWodwNuoJouNP8ThIAVRCx7iyG+?= =?us-ascii?Q?g608oVKt1FYN7yUhgl+GmuMysnYHpDW7OYfT8FWB9AHXEHzb8qGhB4OTY/JB?= =?us-ascii?Q?19oaPOC1qhWTjv1ZaZgsDqzQpOCokorIHuxtPyThXNF5ytwYAEmH+iC6E1RY?= =?us-ascii?Q?fPdeyRkrFCQgqwx8n6wHMigY/O+PzpEv287U7Py3IkPw7EjoBGkWOdjUrVvI?= =?us-ascii?Q?FF877AvakD9X0lOX4Bf2fpYUrI+X+YZkyRPr4zOsFUYkXGQpRd8pqdnUSqv/?= =?us-ascii?Q?/0cvhxDhqRwNZMW1dwyzd+7wurYTJo53Knx1/tu+XhySbZtSpdiEGk/94l1q?= =?us-ascii?Q?hroEzsvXAiFPKyoh4ckcIt39rABrV7f3NJ/8ZoIpANyJwoZqVRV5ih4SRmGm?= =?us-ascii?Q?UXYk++Hnu/REyhhSr9kgZhR2q1zQ97dhJe0NoLHDzv7Zs2KPlJE4qMLgiwwe?= =?us-ascii?Q?gvL/Q65QGu2r7TUQ0Lj+IHL7t/ihZqFYuOKpDsSyzdJh6am02CW4uR0uvQ2E?= =?us-ascii?Q?XQ6DcDsHAz+9/qkezWTvHlQ+ASRNdIiWdxtq1/3PZsMx3NMk+2c7FM3MPZxV?= =?us-ascii?Q?FmGpZ+MPVkFokZg=3D?= X-Forefront-Antispam-Report: CIP:165.204.84.17;CTRY:US;LANG:en;SCL:1;SRV:;IPV:CAL;SFV:NSPM;H:SATLEXMB04.amd.com;PTR:InfoDomainNonexistent;CAT:NONE;SFS:(13230040)(1800799024)(36860700013)(82310400026)(7416014)(376014);DIR:OUT;SFP:1101; X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 16 Mar 2025 10:30:30.3431 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 4be81098-cc18-4792-292d-08dd6475936e 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=[SATLEXMB04.amd.com] X-MS-Exchange-CrossTenant-AuthSource: BL02EPF00021F6E.namprd02.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: SA0PR12MB7075 Content-Type: text/plain; charset="utf-8" Record which CPU updated the stats last. This will be used to invalidate the stats in the following commits. Signed-off-by: K Prateek Nayak --- kernel/sched/fair.c | 5 +++-- kernel/sched/sched.h | 1 + 2 files changed, 4 insertions(+), 2 deletions(-) diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c index 6c486e194a9d..2a34d73d824b 100644 --- a/kernel/sched/fair.c +++ b/kernel/sched/fair.c @@ -10279,9 +10279,9 @@ static inline void cache_sd_stats(struct lb_env *en= v, struct sg_lb_stats *sd_sta { struct sched_domain_shared *sd_share =3D env->sd->shared; struct sg_lb_stats_prop *lb_prop; - int cpu, retry_limit =3D 3; u64 time, lock; long version; + int cpu; =20 if (!sd_share) return; @@ -10319,7 +10319,7 @@ static inline void cache_sd_stats(struct lb_env *en= v, struct sg_lb_stats *sd_sta * Version is up for grabs! Try again. If the CPU grabs * the lock next time around lock =3D version =3D 0 and this * is skipped. If it cannot grab the version, lock !=3D 0 - * and we return from here thus ensuring on a single + * and we return from here thus ensuring only a single * retry. */ if (!lock) { @@ -10330,6 +10330,7 @@ static inline void cache_sd_stats(struct lb_env *en= v, struct sg_lb_stats *sd_sta } =20 lb_prop->sg_stats =3D *sd_stats; + lb_prop->update_cpu =3D cpu; =20 /* * Pairs against readers checking the version diff --git a/kernel/sched/sched.h b/kernel/sched/sched.h index 64f7e013fd59..adf4fa2ed031 100644 --- a/kernel/sched/sched.h +++ b/kernel/sched/sched.h @@ -2197,6 +2197,7 @@ struct sg_lb_stats_prop { */ atomic_long_t version; struct sg_lb_stats sg_stats; /* Cached sched_group stats */ + int update_cpu; /* CPU that updated the stats */ }; =20 static inline struct cpumask *sched_group_span(struct sched_group *sg) --=20 2.43.0