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Thu, 25 Jun 2026 12:47:55 +0000 (GMT) Received: from li-7bb28a4c-2dab-11b2-a85c-887b5c60d769.ibm.com.com (unknown [9.39.20.6]) by smtpav05.fra02v.mail.ibm.com (Postfix) with ESMTP; Thu, 25 Jun 2026 12:47:55 +0000 (GMT) From: Shrikanth Hegde To: linux-kernel@vger.kernel.org, mingo@kernel.org, peterz@infradead.org, juri.lelli@redhat.com, vincent.guittot@linaro.org, yury.norov@gmail.com, kprateek.nayak@amd.com, iii@linux.ibm.com, corbet@lwn.net Cc: sshegde@linux.ibm.com, tglx@kernel.org, gregkh@linuxfoundation.org, pbonzini@redhat.com, seanjc@google.com, vschneid@redhat.com, huschle@linux.ibm.com, rostedt@goodmis.org, dietmar.eggemann@arm.com, maddy@linux.ibm.com, srikar@linux.ibm.com, hdanton@sina.com, chleroy@kernel.org, vineeth@bitbyteword.org, frederic@kernel.org, arighi@nvidia.com, pauld@redhat.com, christian.loehle@arm.com, tj@kernel.org, tommaso.cucinotta@gmail.com, maz@kernel.org, rafael@kernel.org, rdunlap@infradead.org, kernellwp@gmail.com, linux-doc@vger.kernel.org Subject: [PATCH v5 07/24] sched/fair: Select preferred CPU at wakeup when possible Date: Thu, 25 Jun 2026 18:16:31 +0530 Message-ID: <20260625124648.802832-8-sshegde@linux.ibm.com> X-Mailer: git-send-email 2.54.0 In-Reply-To: <20260625124648.802832-1-sshegde@linux.ibm.com> References: <20260625124648.802832-1-sshegde@linux.ibm.com> Precedence: bulk X-Mailing-List: linux-doc@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 X-Proofpoint-Reinject: loops=2 maxloops=12 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNjI1MDExMCBTYWx0ZWRfX2Syq9SwxluA1 11C6RcWTvy7yTVBOrbHW2M9F4sqdsXECutm4PEXMAO76loQenhvZIhQh/K5R8110bQi5PX6ivwq /Q2UDkOrhdxsKD9S7twg3oab/lcR/r3rMPk+68znixaTIahg3nqsXABaz5XSpTxZ1lO/uPMbIVb Ygg6RB5voIPF3kOGjgSU0c8XvYCYhaJNu8uX1MYIGwguHJ4tIYV4eEGgGVsRWKmOmbortlEgxX+ ARTKxy8hVO2cGU3j8NOmQMPCdv5+VUz7/UhaDsyYiKbgDEKx4fQCzcS1ZhHvkPyc0pvMHLd4U3V uHMElQ93AGPZiIbOcAy/73QMfOHBnh7W7/f4vkVnaLctosgOFBUCk13Th817g3vY2jywASJYxoI EXVs9LNEg6HJFh9SpfKWU2EbdjIIodYPRImoR9lMeQqGeoBUzgSDrJmSO1g6HJA+rGP0Ei9VqhS hyMqJI6tDpKNYNyyvPA== X-Proofpoint-GUID: WwsDf1xEg6l2l3zGyQJaHQjUAe7P5MAs X-Proofpoint-Spam-Info: AW1haW4tMjYwNjI1MDExMCBTYWx0ZWRfX43IXY4t8oziF GRjiQjgS+FX2JLaWkqHZlAsBGs3GNJ4b4QZmSjpuZlLdbWY30kSaVB1RhJocxzZUY047RlByCsE xKs/jC5MZevgcF5Dc3a7kgxz/3iegVE= X-Authority-Analysis: v=2.4 cv=I/lVgtgg c=1 sm=1 tr=0 ts=6a3d2388 cx=c_pps a=aDMHemPKRhS1OARIsFnwRA==:117 a=aDMHemPKRhS1OARIsFnwRA==:17 a=FelO9ux0wxsA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=RzCfie-kr_QcCd8fBx8p:22 a=VnNF1IyMAAAA:8 a=aa2H8g5P-lxy6MgAFPcA:9 X-Proofpoint-ORIG-GUID: DfHWljze3ILVVyLacAatY5kZwSz7ykJU X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.125,FMLib:17.12.100.49 definitions=2026-06-25_01,2026-06-24_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 lowpriorityscore=0 spamscore=0 phishscore=0 clxscore=1015 priorityscore=1501 adultscore=0 impostorscore=0 bulkscore=0 suspectscore=0 malwarescore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2606150000 definitions=main-2606250110 Update available_idle_cpu to consider preferred CPUs. This takes care of lot of decisions at wakeup to use only preferred CPUs. There is no need to put those explicit checks everywhere. Signed-off-by: Shrikanth Hegde --- kernel/sched/sched.h | 3 +++ 1 file changed, 3 insertions(+) diff --git a/kernel/sched/sched.h b/kernel/sched/sched.h index 5d009c2529b2..148fe6145f1a 100644 --- a/kernel/sched/sched.h +++ b/kernel/sched/sched.h @@ -1434,6 +1434,9 @@ static inline bool available_idle_cpu(int cpu) if (!idle_rq(cpu_rq(cpu))) return 0; + if (!cpu_preferred(cpu)) + return 0; + if (vcpu_is_preempted(cpu)) return 0; -- 2.47.3