From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mx0a-001b2d01.pphosted.com (mx0a-001b2d01.pphosted.com [148.163.156.1]) (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 3CD05472554 for ; Mon, 12 Oct 2026 12:19:47 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=148.163.156.1 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1791807589; cv=none; b=YC4VaU/IWAadBhIw4dKIWD5i7lhUb6iCLFK72La8mY+x7csmbS+gAl7GfcxgghYpfRLWCjVRSsICt9RzkTgQXrdbtt1Eq7yk52lITbTOFEk6KED3HrOxKXSkijwvsOCymqG/h1/y+bJiqGcX5EBdw6aXjnNKIx0TNomamA7X9qI= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1791807589; c=relaxed/simple; bh=CkEklowoQie3BnQeau/aIqB9kALDtwtjsi1OzZ0YijU=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=TKEsUhCn9lEFsnAkSuCMzuffg88iHX836yJoTuXJi1KQwug/QvnTwWwuN4bmC7BXSkcNYnzVnk/3Z3DarmJ28dEkxwlrWPcLLQAmqqsqXwg6AX/8fPLQxLtbu/MPSgZ/lR70Mf4G7H5oM98I0FYxdAneJn38iQ0VkzNiPAkBMbI= 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=Wa8up/PP; arc=none smtp.client-ip=148.163.156.1 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="Wa8up/PP" Received: from pps.filterd (m0360083.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.18.1.11/8.18.1.11) with ESMTP id 69CCE6YQ316020; Mon, 12 Oct 2026 12:19:29 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ibm.com; h=cc :content-type:date:from:in-reply-to:message-id:mime-version :references:reply-to:subject:to; s=pp1; bh=7Muc5JG4mizx31AbrxHto 9kiMf+HYwiLPxZOyTpDyh0=; b=Wa8up/PP8448R2CDXx40JypRnRX6iulncV+ke /A+waAfBaRwvl5y4PsJFAX+M9P9T2STmscBr85pmU4pvH6nn3VbnZxbDuyP1onAy zmORbjDn1g9YD1SJQa4H9TuZX5qQZckqxS3aEKBs2l4lLulfa0vAEJB+JN64v+LC HDiraPu9Jtgpjhzzv5/iwFy0P2xjwsTIf3cmJv3SMkVWITAGZiSTanbi65TmZQfl m9IWtwX0dB7U28dJ3uWTUlPQtLIS1LTYHEEDiV6MIgy/z9XqCkeHEroSu4pRtasi LPTBOhPh7FBfHnS98CU3xCAQaBulU5ZMNWnpwML8kxPmGl7WQ== Received: from ppma23.wdc07v.mail.ibm.com (5d.69.3da9.ip4.static.sl-reverse.com [169.61.105.93]) by mx0a-001b2d01.pphosted.com (PPS) with ESMTPS id 4h7dug8sx9-1 (version=TLSv1.3 cipher=TLS_AES_256_GCM_SHA384 bits=256 verify=NOT); Mon, 12 Oct 2026 12:19:28 +0000 (GMT) Received: from pps.filterd (ppma23.wdc07v.mail.ibm.com [127.0.0.1]) by ppma23.wdc07v.mail.ibm.com (8.18.1.11/8.18.1.11) with ESMTP id 69CC53gL1287128; Mon, 12 Oct 2026 12:19:27 GMT Received: from smtprelay03.fra02v.mail.ibm.com ([9.218.2.224]) by ppma23.wdc07v.mail.ibm.com (PPS) with ESMTPS id 4h816gw0q1-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Mon, 12 Oct 2026 12:19:27 +0000 (GMT) Received: from smtpav06.fra02v.mail.ibm.com (smtpav06.fra02v.mail.ibm.com [10.20.54.105]) by smtprelay03.fra02v.mail.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 69CCJNhb42926392 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Mon, 12 Oct 2026 12:19:24 GMT Received: from smtpav06.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id D7CAD2004B; Mon, 12 Oct 2026 12:19:23 +0000 (GMT) Received: from smtpav06.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 672EC20049; Mon, 12 Oct 2026 12:19:20 +0000 (GMT) Received: from linux.ibm.com (unknown [9.126.150.29]) by smtpav06.fra02v.mail.ibm.com (Postfix) with SMTP; Mon, 12 Oct 2026 12:19:20 +0000 (GMT) Date: Mon, 12 Oct 2026 17:49:19 +0530 From: Srikar Dronamraju To: Shrikanth Hegde Cc: maddy@linux.ibm.com, linuxppc-dev@lists.ozlabs.org, peterz@infradead.org, tim.c.chen@linux.intel.com, christophe.leroy@csgroup.eu, linux-kernel@vger.kernel.org, ritesh.list@gmail.com, kprateek.nayak@amd.com, yu.c.chen@intel.com, vineethr@linux.ibm.com, vincent.guittot@linaro.org, npiggin@gmail.com, mpe@ellerman.id.au Subject: Re: [PATCH 0/4] powerpc/topology: Introduce llc_override debugfs Message-ID: Reply-To: Srikar Dronamraju References: <20261012102037.2477378-1-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-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline In-Reply-To: <20261012102037.2477378-1-sshegde@linux.ibm.com> X-TM-AS-GCONF: 00 X-Proofpoint-Reinject: loops=2 maxloops=12 X-Authority-Analysis: v=2.4 cv=Cr0q4X4D c=1 sm=1 tr=0 ts=6accd051 cx=c_pps a=3Bg1Hr4SwmMryq2xdFQyZA==:117 a=3Bg1Hr4SwmMryq2xdFQyZA==:17 a=8nJEP1OIZ-IA:10 a=660iZSQnnn4A:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=iQ6ETzBq9ecOQQE5vZCe:22 a=VnNF1IyMAAAA:8 a=kacj0h3wBOg16cJ-Ey0A:9 a=wPNLvfGTeEIA:10 a=ZXulRonScM0A:10 a=zZCYzV9kfG8A:10 X-Proofpoint-GUID: 3yrG65FVefjfY1jFO7W5ktT_2-FDSM9d X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYxMDEyMDA0OCBTYWx0ZWRfX/PF27WqSF4OQ iriI3V1nlLL6UKKlaykNJHDQ3L/0bEoMokkKKMltA9HHfY9EYeNIq1pYhy+NQ00Up3yH84cRy3C U8rI6jlJw2Gj6wHW3yGH5VedeOWKHr390QnYALD2wDzAO/J1okSrGp5qvAK7GlTTJvwFu43mx+k fdGUJaRn5s5iFM8LhH/f0O1fzR0tyQsuvBexGxGsAecaznfB8REqNrR0LjwYP563y4HBjAbyanX NI2/pIXINop4s7ggNO73WhHOSFSaKdPxfPUndG5cooCRU1kF0u4Mj0bhbsEtWwoyJylZOciwbga OzIKuKxixkm5GMoK+4MY3eTZC/+GMCNCeaW10UL9pql71BneTPptnCF3AjyKEvID9AIuBk1M+q+ YK82QDrm+9y4r74514JCtassT1bpaiN0d/OYLrsNVa1o7/7Fx5xsNZgD0ijiR8xRepSyIyH2tt0 4cQEF4tA+XKZTy/YOpA== X-Proofpoint-Spam-Info: AW1haW4tMjYxMDEyMDA0OCBTYWx0ZWRfX3rlVDLiVbf/f WXJPd4UDRgOgfxfZbXsLkVUbAP78eBIJvWK5mFjIYFDdn5kBjr8ACbb1Y6E69H+lSIhX9nzq0YX JPdJQ8YermrDqjBw2l09OEg9ybrSu0E= X-Proofpoint-ORIG-GUID: 2s8Tm2c-9h1kNKXKstlHDCUZBGVzlce3 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=2026-10-12_04,2026-10-09_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 bulkscore=0 spamscore=0 adultscore=0 priorityscore=1501 suspectscore=0 malwarescore=0 clxscore=1011 impostorscore=0 lowpriorityscore=0 phishscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2610080000 definitions=main-2610120048 * Shrikanth Hegde [2026-10-12 15:50:33]: Hi Shrikanth, > There is a new feature in scheduler called as Cache Aware Scheduling [1]. > It tries to keep related tasks within the same LLC domain while > keeping the system reasonably balanced. > > Cache Aware Scheduling assumes that the scheduler LLC domain is large enough > to be a useful placement target. This is true on many systems where an LLC spans > several cores, but not on PowerPC systems where the scheduler-visible LLC is at > the SMT level. In that case, sd_llc_size is effectively the SMT width. > Can we add a reference to the earlier attempt to try MCLLC a few years back. -- Thanks and Regards Srikar Dronamraju