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Fri, 23 Oct 2026 13:17:08 +0000 (GMT) Received: from li-7bb28a4c-2dab-11b2-a85c-887b5c60d769.ibm.com.com (unknown [9.39.19.68]) by smtpav04.fra02v.mail.ibm.com (Postfix) with ESMTP; Fri, 23 Oct 2026 13:17:08 +0000 (GMT) From: Shrikanth Hegde To: maddy@linux.ibm.com, linuxppc-dev@lists.ozlabs.org, peterz@infradead.org, tim.c.chen@linux.intel.com Cc: sshegde@linux.ibm.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, srikar@linux.ibm.com, npiggin@gmail.com, mpe@ellerman.id.au Subject: [PATCH v2 4/4] Documentation/powerpc: Add details about llc_override Date: Fri, 23 Oct 2026 18:46:46 +0530 Message-ID: <20261023131646.2907938-5-sshegde@linux.ibm.com> X-Mailer: git-send-email 2.54.0 In-Reply-To: <20261023131646.2907938-1-sshegde@linux.ibm.com> References: <20261023131646.2907938-1-sshegde@linux.ibm.com> X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 X-Proofpoint-Reinject: loops=2 maxloops=12 X-Proofpoint-GUID: mYiWZWp3FE02QV-FPj1QhIanFZo5R5fE X-Proofpoint-ORIG-GUID: EfNZofRMjBi8XQjEi0XnUdb7SCIFw-Uo X-Proofpoint-Spam-Info: AW1haW4tMjYxMDIzMDA1MSBTYWx0ZWRfX/f3r3u0+F5PE jVxVTyf3siq6HDkkOFgfANlVwk7exnQJfmR8gbpcLs+izJ8uLkI8veV7s9tPZpjJNd+7yXeKGUU KWmdfCnGkX2Qe3i5RdDuGKP5vzP5mlA= X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYxMDIzMDA1MSBTYWx0ZWRfXywBv6kLsNHRN 3w4T8UY153BKIUzdzSdLrahFVf2oMMi1OLJLtW3qDQHD2tuJZUgB5MNhRClWhhh/7s926UFlJeL sq2Nayn6JdD7Ul5xs7A1Tn5o9y6UI6S3JoR7U5XZkndqD8AHx9Gug2FxUgodayURfVw7ITHNIee mpMJV+ot53UPbwObNGd63CF9/kaucg2X13PaQ2edh5AsoMeAmy/xRX7TtyxyAhc6e5BFqXrrFHq pe2tauvjzuWXsAz8DdsQrYtvZavCA0O+m1Ip60j68Q/vCowPWp38xtVkeXBtznYj+k8wHhYY/j6 SSR0ZjJ5dF5iOed4EQP2CkZ+fqF81sh1TKj+jaTRxbnwMUQgHFxdaX1u1Um3JYZKKwZRZEi0DS5 vd+13Iggt7LNdAL3WfITv3pMBgDhn0R6xszHaeHYEcvzd0uSG1OaGLUIMXeamuG6bEDpWhxusfL NntgxzW2LADX85h2ptA== X-Authority-Analysis: v=2.4 cv=Gb2CDgXL c=1 sm=1 tr=0 ts=6adb5e5e cx=c_pps a=3Bg1Hr4SwmMryq2xdFQyZA==:117 a=3Bg1Hr4SwmMryq2xdFQyZA==:17 a=660iZSQnnn4A:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=uAbxVGIbfxUO_5tXvNgY:22 a=VnNF1IyMAAAA:8 a=EDzFc5kV9KizNyu6t7gA:9 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1176,Hydra:6.1.138,FMLib:17.12.100.49 definitions=2026-10-23_03,2026-10-21_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 suspectscore=0 adultscore=0 malwarescore=0 spamscore=0 phishscore=0 clxscore=1015 bulkscore=0 impostorscore=0 lowpriorityscore=0 priorityscore=1501 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2610190000 definitions=main-2610230051 Provide documentation for the newly introduced llc_override kernel parameter. This may help one if they want to experiment with cache aware scheduling on powerpc. Signed-off-by: Shrikanth Hegde --- Documentation/admin-guide/kernel-parameters.txt | 15 +++++++++++++++ 1 file changed, 15 insertions(+) diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt index fbee7b544903..e13514076c18 100644 --- a/Documentation/admin-guide/kernel-parameters.txt +++ b/Documentation/admin-guide/kernel-parameters.txt @@ -3568,6 +3568,21 @@ Kernel parameters Enable Live Update Orchestrator (LUO). Default: off. + llc_override= [PPC] Override the scheduler-visible LLC domain. + Format: { mc | pkg } + + Use the specified topology domain as the LLC domain + for scheduler decisions. This is intended for + experimenting with Cache Aware Scheduling. + + mc Use the MC domain as the LLC domain. + pkg Use the package domain as the LLC domain. + + If unset, use the platform-provided LLC topology. + + This is a debug option only. It does not change the + hardware cache topology. + lockd.nlm_grace_period=P [NFS] Assign grace period. Format: -- 2.52.0