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Tue, 8 Jul 2025 07:54:31 +0000 Message-ID: <4942856d-ad2f-4922-aad9-20a902dae41b@intel.com> Date: Tue, 8 Jul 2025 15:54:19 +0800 User-Agent: Mozilla Thunderbird Subject: Re: [RFC patch v3 02/20] sched: Several fixes for cache aware scheduling To: Libo Chen CC: Juri Lelli , Dietmar Eggemann , Steven Rostedt , Ben Segall , Mel Gorman , Valentin Schneider , Tim Chen , Vincent Guittot , Abel Wu , "Madadi Vineeth Reddy" , Hillf Danton , "Len Brown" , , Tim Chen , Ingo Molnar , K Prateek Nayak , Peter Zijlstra , "Gautham R . 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Fix compile error on percpu allocation. >> 2. Enqueue to the target CPU rather than the current CPU. >> 3. NULL LLC sched domain check(Libo Chen). > > Can I suggest we completely disable cache-aware scheduling > for systems without any LLC in the next version? No more added > fields, function code for them. This info should be easily > determinable during bootup while building up the topology, > and cannot be modified during runtime. Sometimes it's not > possible for distros to disable it in kconfig just for one > particular CPU, and SCHED_CACHE_LB isn't enough for removing > the added fields and users can turn it back on anyway. > Good point, my understanding is that we should introduce a static key similar to sched_smt_present to get rid of the cache-aware scheduling code path if either LLC is not present or there is only 1 LLC within the Node. Thanks, Chenyu > Thanks, > Libo > >