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Mon, 12 Oct 2026 14:10:34 +0000 (GMT) Received: from [9.124.214.197] (unknown [9.124.214.197]) by smtpav02.fra02v.mail.ibm.com (Postfix) with ESMTP; Mon, 12 Oct 2026 14:10:34 +0000 (GMT) Message-ID: <26486e03-b1f0-4a84-b6df-75b747d9f1a1@linux.ibm.com> Date: Mon, 12 Oct 2026 19:40:33 +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 1/4] powerpc/topology: Introduce llc_override debug knob To: Srikar Dronamraju 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 References: <20261012102037.2477378-1-sshegde@linux.ibm.com> <20261012102037.2477378-2-sshegde@linux.ibm.com> Content-Language: en-US From: Shrikanth Hegde In-Reply-To: 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-Proofpoint-GUID: VWKI_jMXA0P5Zyx_NXJLsX8_YrN_R6By X-Proofpoint-ORIG-GUID: kQ4lXvMh1A4bc9lxmT3TKRTcZ7Z210ZD X-Authority-Analysis: v=2.4 cv=aqInmiZV c=1 sm=1 tr=0 ts=6accea62 cx=c_pps a=aDMHemPKRhS1OARIsFnwRA==:117 a=aDMHemPKRhS1OARIsFnwRA==:17 a=IkcTkHD0fZMA:10 a=660iZSQnnn4A:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=U7nrCbtTmkRpXpFmAIza:22 a=2npZI0HAQQjSB1Li4OYA:9 a=QEXdDO2ut3YA:10 X-Proofpoint-Spam-Info: AW1haW4tMjYxMDEyMDA1NCBTYWx0ZWRfX/7CEXfTH6q/I bmjpEeTxk9H9SL8rrjbP3u4sjYMHIOgTlhy5027nxmfdyOotxN3z6UMfjJUxmOVWsO6d3v5hMC0 bszJHaL0D3r977XEl3jAEPJ/iwxsNNU= X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYxMDEyMDA1NCBTYWx0ZWRfX1rwqEcuFfmtc 0/daJ/3l8GNxfP9tjACqytZ3EHcHswXtOhv2EK8acSgjZdcwQHp/3kp+zk+mXxwL+FUBKlbS9HS hAtclkIrMLQ6RCdRvbvc0qb3pGSx2Xo5Fp8AVOcnlfeI0GlE2iGtt+Ss0+ifFdC8eSdeCxFKEIJ 70n4hClKgeprpEQh6AOrshM7ggdAfYezb9qiUa0uWLq1l+E6Vg5FtonZOv+k08LLMklYGc5QqsF uABke0og7822lcLfoCg3vs7WjIdvjploeStu5PgXBGQJq4PfgIt24idAEEVK4lHO43NLSpLGTgi Bgt5LdBJAmGYbiPYAu0W6QklnJMmKumUha8nhFZahPpbtv4kGnmkZifGEX5zJx51C8inO+p7f50 4u59f22sfpYN2Og55Pc0gf3ZEzR+jmZPH9hfIjh/qs8t7ECNIGQPw5JCWCIIWzkCCrCU61Lx4My e8SpV/jhlmrCH3tnxbQ== 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 phishscore=0 clxscore=1015 spamscore=0 malwarescore=0 suspectscore=0 bulkscore=0 adultscore=0 impostorscore=0 priorityscore=1501 lowpriorityscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2610080000 definitions=main-2610120054 Hi Srikar. Thanks for taking a look at the patches. >> #endif >> + >> +enum llc_override_values { >> + LLC_OVERRIDE_DISABLED, >> + LLC_OVERRIDE_SMT, >> + LLC_OVERRIDE_MC, >> + LLC_OVERRIDE_PKG, >> +}; >> + > > For the current experiments, would it help to keep it simple and have just > SMT and MC. I mean we can include disabled and pkg based on our experiments. > I think we should keep disabled. So it is clear when disabled, there is no adverse effect of it. I think keeping pkg for experimentation seems okay. If not necessary we can remove it later. Having at pkg gives you to try increased number of cores in a llc. So it may be a useful too IMHO.