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On 8/19/2025 10:00 PM, Valentin Schneider wrote: > On 19/08/25 02:57, Adam Li wrote: >> A qualified CPU to run NOHZ idle load balancing (ILB) has to be: >> 1) housekeeping CPU in housekeeping_cpumask(HK_TYPE_KERNEL_NOISE) >> 2) and in nohz.idle_cpus_mask >> 3) and idle >> 4) and not current CPU >> >> If most CPUs are in nohz_full CPU list there is few housekeeping CPU left. >> In the worst case if all CPUs are in nohz_full only the boot CPU is used >> for housekeeping. And the housekeeping CPU is usually busier so it will >> be unlikely added to nohz.idle_cpus_mask. >> >> Therefore if there is few housekeeping CPUs, find_new_ilb() may likely >> failed to find any CPU to do NOHZ idle load balancing. Some NOHZ CPUs may >> stay idle while other CPUs are busy. >> >> This patch adds fallback options when looking for ILB CPU if there is >> no CPU meeting above requirements. Then it searches in bellow order: >> 1) Try looking for the first idle housekeeping CPU >> 2) Try looking for the first idle CPU in nohz.idle_cpus_mask if no SMT. >> 3) Select the first housekeeping CPU even if it is busy. >> >> With this patch the NOHZ idle balancing happens more frequently. >> > > I'm not understanding why, in the scenarios outlined above, more NOHZ idle > balancing is a good thing. > > Considering only housekeeping CPUs, they're all covered by wakeup, periodic > and idle balancing (on top of NOHZ idle balancing when relevant). So if > find_new_ilb() never finds a NOHZ-idle CPU, then that means your HK CPUs > are either always busy or never stopping the tick when going idle, IOW they > always have some work to do within a jiffy boundary. > > Am I missing something? > I agree with your description about the housekeeping CPUs. In the worst case, the system only has one housekeeping CPU and this housekeeping CPU is so busy that: 1) This housekeeping CPU is unlikely idle; 2) and this housekeeping CPU is unlikely in 'nohz.idle_cpus_mask' because tick is not stopped. Therefore find_new_ilb() may very likely return -1. *No* CPU can be selected to do NOHZ idle load balancing. This patch tries to fix the imbalance of NOHZ idle CPUs (CPUs in nohz.idle_cpus_mask). Here is more background: When running llama on arm64 server, some CPUs *keep* idle while others are 100% busy. All CPUs are in 'nohz_full=' cpu list, and CONFIG_NO_HZ_FULL is set. The problem is caused by two issues: 1) Some idle CPUs cannot be added to 'nohz.idle_cpus_mask', this bug is fixed by another patch: https://lore.kernel.org/all/20250815065115.289337-2-adamli@os.amperecomputing.com/ 2) Even if the idle CPUs are in 'nohz.idle_cpus_mask', *no* CPU can be selected to do NOHZ idle load balancing because conditions in find_new_ilb() is too strict. This patch tries to solve this issue. Hope this information helps. Thanks, -adam