From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mx0b-001b2d01.pphosted.com (mx0b-001b2d01.pphosted.com [148.163.158.5]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id CCC8043F4AA; Fri, 25 Sep 2026 09:50:16 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=148.163.158.5 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790329818; cv=none; b=QEqyDO/qVB2J1Q7OB0Tt42N64whhJcjOPFQPAWvGi0F/QBpWeNV04PYhNBxdoSFg3ICMevwR4CaPmQokvU983FeMle+SO4zrp7oLQ71XZlZT9AEhku/SFtzzE9ZDySnINK+AIjuAhRx10uMsBBfF7ILEjD3WFwFOmjM7pUtnGj8= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790329818; c=relaxed/simple; bh=fq792iZnf1EX2HMh49l4ybkVGmrgVT0JRKhhjP1neTI=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=BMFZjEgQMPUcQLdc0kiR7C6e+Nc9I8ff3N0OngRpzVxhf93Y2RaDVZHjd+mxKqFe/9/VjbjEm7pBY7v/bZNv0vABtxmOxzVQcNFCQXcrBQCW83mXZdkvXvuf0QuffZuDpSvEh2gKVOj6z4zI/h0gFxFpsx19Ojjo3sfxDw9c61Y= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.ibm.com; spf=pass smtp.mailfrom=linux.ibm.com; dkim=pass (2048-bit key) header.d=ibm.com header.i=@ibm.com header.b=M3vt2dXS; arc=none smtp.client-ip=148.163.158.5 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.ibm.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linux.ibm.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=ibm.com header.i=@ibm.com header.b="M3vt2dXS" Received: from pps.filterd (m0353725.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.18.1.11/8.18.1.11) with ESMTP id 68P4athd3084914; Fri, 25 Sep 2026 09:49:54 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ibm.com; h=cc :content-transfer-encoding:content-type:date:from:in-reply-to :message-id:mime-version:references:subject:to; s=pp1; bh=RFjdSO 0fRLrDwHiIbpDxY65cWE6AYquTLWo5HDV8bxI=; b=M3vt2dXSt4/eJcodlpeuWK YxA5/vvbVGAu89VMVBngNc17JkSzY0ZQg+KEMqN5JL6S3yPj2sF1SiAywPcrMU99 4m2BvSKDT16jbJb+ZvYaJRsl4T3fkmg1u1bIZA9XK80Bh/tJ93B094hBVUEemCSj z/VNjortrFpsVUlfBf0r+8Az7Y0NTx9zf5MeX8usk3TYKDj8smf06d908c8D/LVw GNWzXDL+D+25dritaWUJdmBR+kg90gmH3BeMz2Q9bP12CfaETsOLyT/uVyLeTxnc 94msbSghg5BqSnF8aC00OMIVa20No3IBjliTxbG69h0fv+r3S3FLYPzNL+nBJIWQ == Received: from ppma21.wdc07v.mail.ibm.com (5b.69.3da9.ip4.static.sl-reverse.com [169.61.105.91]) by mx0a-001b2d01.pphosted.com (PPS) with ESMTPS id 4gskgqwayb-1 (version=TLSv1.3 cipher=TLS_AES_256_GCM_SHA384 bits=256 verify=NOT); Fri, 25 Sep 2026 09:49:53 +0000 (GMT) Received: from pps.filterd (ppma21.wdc07v.mail.ibm.com [127.0.0.1]) by ppma21.wdc07v.mail.ibm.com (8.18.1.11/8.18.1.11) with ESMTP id 68P9m6aN3248950; Fri, 25 Sep 2026 09:49:53 GMT Received: from smtprelay06.fra02v.mail.ibm.com ([9.218.2.230]) by ppma21.wdc07v.mail.ibm.com (PPS) with ESMTPS id 4gvbt31t97-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Fri, 25 Sep 2026 09:49:53 +0000 (GMT) Received: from smtpav02.fra02v.mail.ibm.com (smtpav02.fra02v.mail.ibm.com [10.20.54.101]) by smtprelay06.fra02v.mail.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 68P9nntA53412332 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Fri, 25 Sep 2026 09:49:49 GMT Received: from smtpav02.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 2C5F22004B; Fri, 25 Sep 2026 09:49:49 +0000 (GMT) Received: from smtpav02.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 2C18820040; Fri, 25 Sep 2026 09:49:41 +0000 (GMT) Received: from [9.39.19.124] (unknown [9.39.19.124]) by smtpav02.fra02v.mail.ibm.com (Postfix) with ESMTP; Fri, 25 Sep 2026 09:49:40 +0000 (GMT) Message-ID: Date: Fri, 25 Sep 2026 15:19:40 +0530 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v13 09/13] sched/debug: Add migration stats due to non preferred CPUs To: Peter Zijlstra Cc: linux-kernel@vger.kernel.org, mingo@kernel.org, juri.lelli@redhat.com, vincent.guittot@linaro.org, yury.norov@gmail.com, kprateek.nayak@amd.com, iii@linux.ibm.com, corbet@lwn.net, meted@linux.ibm.com, ynorov@nvidia.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, jgross@suse.com, virtualization@lists.linux.dev, sunlightlinux@gmail.com References: <20260909135617.871006-1-sshegde@linux.ibm.com> <20260909135617.871006-10-sshegde@linux.ibm.com> <20260925075134.GH4121339@noisy.programming.kicks-ass.net> Content-Language: en-US From: Shrikanth Hegde In-Reply-To: <20260925075134.GH4121339@noisy.programming.kicks-ass.net> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-TM-AS-GCONF: 00 X-Proofpoint-Reinject: loops=2 maxloops=12 X-Authority-Analysis: v=2.4 cv=G+OJgNk5 c=1 sm=1 tr=0 ts=6ab643c2 cx=c_pps a=GFwsV6G8L6GxiO2Y/PsHdQ==:117 a=GFwsV6G8L6GxiO2Y/PsHdQ==:17 a=IkcTkHD0fZMA:10 a=VdqzKS8jKosA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=V8glGbnc2Ofi9Qvn3v5h:22 a=SGBh-QMtgtaYjPv-_jIA:9 a=QEXdDO2ut3YA:10 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwOTI1MDAzOCBTYWx0ZWRfX6WyNKe8/6vBv F5CIU4LJdWYyEi+vZNfiq6R19bOL3vfMw02pUJhi6Y1ES78IL3XbduN1So1BJh0CdS0FKRkflhv MbVD8d0hV6Pb8IoqP7LMd2QMbRzXS+F0rUdX05z2sKuPL4cZ8YDpBSAS56JzwGJCBdCfcTHeksT 9MjLnYwjRdeu8b6MRvdjJeVvagyQ6JYA887Mv6JgK+iEkCbU9bj2qpB+KXIqgJnjOKCSnUpf02q mjGQkeiFmIq07Qv3qZq78uTOc/n3S7jfnwYKe66f9RjPraWXt+5wR04EvsWU27+YAuVRORO5FHK qaUBiz1+ETeEoZlBgLNLUdEKNFYmwGFNep5yhBffn1hQwEewsI7Ys2nwlB7ym88dz5FQ2NIOgtO pgVaIY0nXeiuqs9pN+lZ9+cHJTrxPmyuLcGv8T2Q09hWSjUtOfg/nf8QHIskqf7XvWy+QOF6+He Hb8Xn7A7LHBRFY1kqiA== X-Proofpoint-ORIG-GUID: Il0JpxIQlFyfku8N6UHX21EUtSFreeG6 X-Proofpoint-GUID: PBmAX94aFTjtYRSCKyUhQfRtYKIS6xwH X-Proofpoint-Spam-Info: AW1haW4tMjYwOTI1MDAzOCBTYWx0ZWRfX5tvDTXekGsLD plFqoIlXRD1p7WeZMj/YqM4h8Szwo9QscqlNC1jWoDDsdswjiI0QgrjD2wmajcDJPGutB7pn7Cg z/xbamXj/tvL40M23wTwFvHEOdC7w60= X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1176,Hydra:6.1.134,FMLib:17.12.100.49 definitions=2026-09-25_02,2026-09-21_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 suspectscore=0 adultscore=0 phishscore=0 lowpriorityscore=0 impostorscore=0 bulkscore=0 priorityscore=1501 clxscore=1015 spamscore=0 malwarescore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2609040000 definitions=main-2609250038 Hi Peter. On 9/25/26 1:21 PM, Peter Zijlstra wrote: > On Wed, Sep 09, 2026 at 07:26:13PM +0530, Shrikanth Hegde wrote: >> Add a new stat, >> - nr_migrations_cpu_non_preferred: number of migrations happened since >> a CPU was marked as non preferred due to high steal time. > > My reading of the below code ends up with something like: > > - nr_migrations_cpu_non_preferred: number of push migrations while the > CPU is non-preferred. > > Hmm? Indeed. Will update the changelog.