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| author | Linus Torvalds <torvalds@linux-foundation.org> | 2021-12-12 09:38:04 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2021-12-12 09:38:04 -0800 |
| commit | 773602256a2ca73455b0baeae5737c4a9ed6ef49 (patch) | |
| tree | cfb4ed5ba04a8d9fd28e1bc19644f8e70513c515 | |
| parent | 0f3d41e82d78bf521dfee4d6db1d247628dcf399 (diff) | |
| parent | cabdc3a8475b918e55744f43719b26a82dc8fa6b (diff) | |
Merge tag 'sched-urgent-2021-12-12' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull scheduler fix from Thomas Gleixner:
"A single fix for the x86 scheduler topology:
Using cluster topology on hybrid CPUs, e.g. Alder Lake, biases the
scheduler towards the ATOM cluster as that has more total capacity.
Use selection based on CPU priority instead"
* tag 'sched-urgent-2021-12-12' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
sched,x86: Don't use cluster topology for x86 hybrid CPUs
| -rw-r--r-- | arch/x86/kernel/smpboot.c | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/arch/x86/kernel/smpboot.c b/arch/x86/kernel/smpboot.c index ac2909f0cab3..617012f4619f 100644 --- a/arch/x86/kernel/smpboot.c +++ b/arch/x86/kernel/smpboot.c @@ -579,6 +579,17 @@ static struct sched_domain_topology_level x86_numa_in_package_topology[] = { { NULL, }, }; +static struct sched_domain_topology_level x86_hybrid_topology[] = { +#ifdef CONFIG_SCHED_SMT + { cpu_smt_mask, x86_smt_flags, SD_INIT_NAME(SMT) }, +#endif +#ifdef CONFIG_SCHED_MC + { cpu_coregroup_mask, x86_core_flags, SD_INIT_NAME(MC) }, +#endif + { cpu_cpu_mask, SD_INIT_NAME(DIE) }, + { NULL, }, +}; + static struct sched_domain_topology_level x86_topology[] = { #ifdef CONFIG_SCHED_SMT { cpu_smt_mask, x86_smt_flags, SD_INIT_NAME(SMT) }, @@ -1469,8 +1480,11 @@ void __init native_smp_cpus_done(unsigned int max_cpus) calculate_max_logical_packages(); + /* XXX for now assume numa-in-package and hybrid don't overlap */ if (x86_has_numa_in_package) set_sched_topology(x86_numa_in_package_topology); + if (cpu_feature_enabled(X86_FEATURE_HYBRID_CPU)) + set_sched_topology(x86_hybrid_topology); nmi_selftest(); impress_friends(); |