From 046a5a95c3b0425cfe79e43021d8ee90c1c4f8c9 Mon Sep 17 00:00:00 2001 From: Ricardo Neri Date: Thu, 6 Apr 2023 13:31:47 -0700 Subject: [PATCH] x86/sched/itmt: Give all SMT siblings of a core the same priority X86 does not have the SD_ASYM_PACKING flag in the SMT domain. The scheduler knows how to handle SMT and non-SMT cores of different priority. There is no reason for SMT siblings of a core to have different priorities. Signed-off-by: Ricardo Neri Signed-off-by: Peter Zijlstra (Intel) Reviewed-by: Len Brown Tested-by: Zhang Rui Link: https://lore.kernel.org/r/20230406203148.19182-12-ricardo.neri-calderon@linux.intel.com --- arch/x86/kernel/itmt.c | 23 +++++------------------ 1 file changed, 5 insertions(+), 18 deletions(-) diff --git a/arch/x86/kernel/itmt.c b/arch/x86/kernel/itmt.c index 670eb08..ee4fe8c 100644 --- a/arch/x86/kernel/itmt.c +++ b/arch/x86/kernel/itmt.c @@ -165,32 +165,19 @@ int arch_asym_cpu_priority(int cpu) /** * sched_set_itmt_core_prio() - Set CPU priority based on ITMT - * @prio: Priority of cpu core - * @core_cpu: The cpu number associated with the core + * @prio: Priority of @cpu + * @cpu: The CPU number * * The pstate driver will find out the max boost frequency * and call this function to set a priority proportional - * to the max boost frequency. CPU with higher boost + * to the max boost frequency. CPUs with higher boost * frequency will receive higher priority. * * No need to rebuild sched domain after updating * the CPU priorities. The sched domains have no * dependency on CPU priorities. */ -void sched_set_itmt_core_prio(int prio, int core_cpu) +void sched_set_itmt_core_prio(int prio, int cpu) { - int cpu, i = 1; - - for_each_cpu(cpu, topology_sibling_cpumask(core_cpu)) { - int smt_prio; - - /* - * Ensure that the siblings are moved to the end - * of the priority chain and only used when - * all other high priority cpus are out of capacity. - */ - smt_prio = prio * smp_num_siblings / (i * i); - per_cpu(sched_core_priority, cpu) = smt_prio; - i++; - } + per_cpu(sched_core_priority, cpu) = prio; } -- 2.7.4