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Wed, 7 Jan 2026 08:38:47 +0000 Message-ID: <7dab5ae3-496d-408e-83c8-d5df104b9f87@intel.com> Date: Wed, 7 Jan 2026 16:38:33 +0800 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2 05/23] sched/cache: Assign preferred LLC ID to processes To: Jianyong Wu , Tim Chen CC: Juri Lelli , Dietmar Eggemann , Steven Rostedt , Ben Segall , Mel Gorman , Valentin Schneider , Madadi Vineeth Reddy , "Hillf Danton" , Shrikanth Hegde , "Yangyu Chen" , Tingyin Duan , Vern Hao , Vern Hao , Len Brown , Aubrey Li , Zhao Liu , Chen Yu , Adam Li , Aaron Lu , Tim Chen , , Peter Zijlstra , Ingo Molnar , K Prateek Nayak , "Gautham R . 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>> + >> +#ifdef CONFIG_NUMA_BALANCING >> +        /* >> +         * Don't assign preferred LLC if it >> +         * conflicts with NUMA balancing. >> +         */ >> +        if (p->numa_preferred_nid >= 0 && >> +            cpu_to_node(mm->mm_sched_cpu) != p->numa_preferred_nid) >> +            mm_sched_llc = -1; > > Scenario: NUMA balancing is initially enabled and numa_preferred_nid is > set. After disabling NUMA balancing, numa_preferred_nid is not cleared, > leading to unintended impact of NUMA balancing on cache-aware > scheduling. Should we check if NUMA balancing is disabled before > checking numa_preferred_nid? > Good point, sched_numa_balancing should be checked here. thanks, Chenyu > Thanks > Jianyong Wu >