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Wed, 25 Jun 2025 19:11:36 +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, kprateek.nayak@amd.com, huschle@linux.ibm.com, srikar@linux.ibm.com, linux-kernel@vger.kernel.org, christophe.leroy@csgroup.eu, linuxppc-dev@lists.ozlabs.org, gregkh@linuxfoundation.org Subject: [RFC v2 3/9] sched/core: Dont allow to use CPU marked as avoid Date: Thu, 26 Jun 2025 00:41:02 +0530 Message-ID: <20250625191108.1646208-4-sshegde@linux.ibm.com> X-Mailer: git-send-email 2.43.5 In-Reply-To: <20250625191108.1646208-1-sshegde@linux.ibm.com> References: <20250625191108.1646208-1-sshegde@linux.ibm.com> X-Mailing-List: linuxppc-dev@lists.ozlabs.org List-Id: List-Help: List-Owner: List-Post: List-Archive: , List-Subscribe: , , List-Unsubscribe: Precedence: list MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjUwNjI1MDE0MSBTYWx0ZWRfX+9zz7S7zt8OY PYmAGu7oleBftnpgl1i7AurTlVXy4W11lCiBLWFo4ew7+cfj1xO3Joh6hRn2rbHGLFHnKbJNDnc PjPrCoVS6Ueld9p8q5Fsd5tfAQWquCxXxdR6j/t8Wo7sEg5BcgSKUN1jfUBT1RAP4fFhICUz0Mt 8vlp4s4v7aAawsUWCtXPwawSHIaDlp7SZ6obR0XFW4qr7HoiFjw1zkvXjHGPq6ytbGDFyd9m8wH 51yDEzPbLRnec8b7fLx11eYKExYftxo/JB2i4OeOaZw4uzGV6g7LPGOjMuRkXn7jC2n0P3zKgth 1E02DARsEsT48RZ3+Of52BLmvNidixjbt8mGRXePvCYwcyVEYnnJqycJyK0mdUqFBzEryr/X512 So+b4R9aFjCaFNGY2VcfEiNYkRK7TBYjMgfLUaCfjb3++VgH2pJUrqUKIIEf0Blhg8XU8Usg X-Proofpoint-GUID: MRni0sA2uOHcIMTzZDYYwKh2R39SA0EW X-Proofpoint-ORIG-GUID: DY4JTPV7yGNFAd5UB6MhFXIPQqQUPWgt X-Authority-Analysis: v=2.4 cv=combk04i c=1 sm=1 tr=0 ts=685c49f2 cx=c_pps a=GFwsV6G8L6GxiO2Y/PsHdQ==:117 a=GFwsV6G8L6GxiO2Y/PsHdQ==:17 a=uXBPIk7YWzXHA4pK:21 a=6IFa9wvqVegA:10 a=VnNF1IyMAAAA:8 a=9VCDzUkOGS52xXVBuocA:9 a=zZCYzV9kfG8A:10 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1099,Hydra:6.1.7,FMLib:17.12.80.40 definitions=2025-06-25_06,2025-06-25_01,2025-03-28_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 malwarescore=0 spamscore=0 adultscore=0 mlxlogscore=656 clxscore=1015 impostorscore=0 suspectscore=0 mlxscore=0 phishscore=0 lowpriorityscore=0 bulkscore=0 classifier=spam authscore=0 authtc=n/a authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.19.0-2505280000 definitions=main-2506250141 Don't allow the CPU marked as avoid. This is used when task is pushed out of a CPU marked as avoid in select_fallback_rq Signed-off-by: Shrikanth Hegde --- kernel/sched/core.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/kernel/sched/core.c b/kernel/sched/core.c index 0e3a00e2a2cc..13e44d7a0b90 100644 --- a/kernel/sched/core.c +++ b/kernel/sched/core.c @@ -2437,6 +2437,10 @@ static inline bool is_cpu_allowed(struct task_struct *p, int cpu) if (cpu_dying(cpu)) return false; + /* CPU marked as avoid, shouldn't chosen to run any task*/ + if (cpu_avoid(cpu)) + return false; + /* But are allowed during online. */ return cpu_online(cpu); } -- 2.43.0