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Fri, 23 May 2025 18:15:10 GMT Received: from smtpav07.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 0EB922004D; Fri, 23 May 2025 18:15:10 +0000 (GMT) Received: from smtpav07.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 88A2120040; Fri, 23 May 2025 18:15:06 +0000 (GMT) Received: from li-7bb28a4c-2dab-11b2-a85c-887b5c60d769.ibm.com.com (unknown [9.124.221.90]) by smtpav07.fra02v.mail.ibm.com (Postfix) with ESMTP; Fri, 23 May 2025 18:15:06 +0000 (GMT) From: Shrikanth Hegde To: mingo@redhat.com, peterz@infradead.org, juri.lelli@redhat.com, vincent.guittot@linaro.org, tglx@linutronix.de, yury.norov@gmail.com, maddy@linux.ibm.com Cc: sshegde@linux.ibm.com, vschneid@redhat.com, dietmar.eggemann@arm.com, rostedt@goodmis.org, jstultz@google.com, kprateek.nayak@amd.com, huschle@linux.ibm.com, srikar@linux.ibm.com, linux-kernel@vger.kernel.org, linux@rasmusvillemoes.dk Subject: [RFC PATCH 3/5] sched/fair: Don't use parked cpu for load balancing Date: Fri, 23 May 2025 23:44:46 +0530 Message-ID: <20250523181448.3777233-4-sshegde@linux.ibm.com> X-Mailer: git-send-email 2.43.5 In-Reply-To: <20250523181448.3777233-1-sshegde@linux.ibm.com> References: <20250523181448.3777233-1-sshegde@linux.ibm.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-TM-AS-GCONF: 00 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjUwNTIzMDE2MCBTYWx0ZWRfX4aSuiwL5n6c8 wBsEekn/gjJagKBEvEwkxfLqe0dx2Y9bzMbEOBmSjE6n58KtotB4gqjPZJuBAMWx2S4g9C7q7i4 995snCu9zaIzCcS62KHC8BeKNninEQfTpUN/EUqPWgltruzOrB8/PMTZTRPeLCAYzyBVSBy2Ljp YaPGoVD0WHTW4sCV79dafGlKjrjW5CHFHCWx1dZjiPkUFp+4PudS1blAnSlvvnPF5B5vo4dkAnd W8lqKhAhWCTPUBQIhLGQxQ8fUzivdSXC70MUCl6NamfQUIOWh6XFR6tS3EZdwB7NqnT399UiXWl zk0riaBiI8/7sf81IUNRss6ffS2m6PYqTt0dQ/nf/ZEfQ6cVP72jSQHn8SQ3RpDjIm1JiS4gV7K XwKtXag5NaR3Z/PDhSwH1/12t0+70PEu/0uVe3a6jFSvGEtQ6zRELKbdfbSzZ+8xmMce7xPC X-Proofpoint-GUID: eaGTPgHY3EZr-nUxp4AbzqN_hzfpbuK- X-Authority-Analysis: v=2.4 cv=O685vA9W c=1 sm=1 tr=0 ts=6830bb33 cx=c_pps a=3Bg1Hr4SwmMryq2xdFQyZA==:117 a=3Bg1Hr4SwmMryq2xdFQyZA==:17 a=dt9VzEwgFbYA:10 a=VnNF1IyMAAAA:8 a=A_CrLDhOnlH3o789EtUA:9 X-Proofpoint-ORIG-GUID: zIJN5OVqRKkafCGM_wMMIM7SQAR6Rykl X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1099,Hydra:6.0.736,FMLib:17.12.80.40 definitions=2025-05-23_06,2025-05-22_01,2025-03-28_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 adultscore=0 mlxlogscore=579 spamscore=0 mlxscore=0 phishscore=0 bulkscore=0 priorityscore=1501 lowpriorityscore=0 impostorscore=0 clxscore=1011 malwarescore=0 suspectscore=0 classifier=spam authscore=0 authtc=n/a authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.19.0-2505160000 definitions=main-2505230160 Content-Type: text/plain; charset="utf-8" While doing load balance, don't consider the parked CPUs. As far as load balance is considered, a parked CPU is as good as offline CPU.=20 Signed-off-by: Shrikanth Hegde --- kernel/sched/fair.c | 1 + 1 file changed, 1 insertion(+) diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c index 125912c0e9dd..f48f55ca1522 100644 --- a/kernel/sched/fair.c +++ b/kernel/sched/fair.c @@ -11761,6 +11761,7 @@ static int sched_balance_rq(int this_cpu, struct rq= *this_rq, }; =20 cpumask_and(cpus, sched_domain_span(sd), cpu_active_mask); + cpumask_andnot(cpus, cpus, cpu_parked_mask); =20 schedstat_inc(sd->lb_count[idle]); =20 --=20 2.39.3