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| author | Oliver O'Halloran <oohall@gmail.com> | 2017-06-29 09:12:55 +0200 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2017-08-31 06:26:56 +0200 |
| commit | 2a636a56d2d39676fe85190dec102c7440e24977 (patch) | |
| tree | 8baf43a855645c57565231e16b1bd36612103234 /arch/powerpc/kernel | |
| parent | powerpc/smp: Rework CPU topology construction (diff) | |
| download | linux-2a636a56d2d39676fe85190dec102c7440e24977.tar.xz linux-2a636a56d2d39676fe85190dec102c7440e24977.zip | |
powerpc/smp: Add cpu_l2_cache_map
We want to add an extra level to the CPU scheduler topology to account
for cores which share a cache. To do this we need to build a cpumask
for each CPU that indicates which CPUs share this cache to use as an
input to the scheduler.
Signed-off-by: Oliver O'Halloran <oohall@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'arch/powerpc/kernel')
| -rw-r--r-- | arch/powerpc/kernel/smp.c | 23 |
1 files changed, 17 insertions, 6 deletions
diff --git a/arch/powerpc/kernel/smp.c b/arch/powerpc/kernel/smp.c index a29c23bd9f2e..b42c868e1ac1 100644 --- a/arch/powerpc/kernel/smp.c +++ b/arch/powerpc/kernel/smp.c @@ -75,9 +75,11 @@ static DEFINE_PER_CPU(int, cpu_state) = { 0 }; struct thread_info *secondary_ti; DEFINE_PER_CPU(cpumask_var_t, cpu_sibling_map); +DEFINE_PER_CPU(cpumask_var_t, cpu_l2_cache_map); DEFINE_PER_CPU(cpumask_var_t, cpu_core_map); EXPORT_PER_CPU_SYMBOL(cpu_sibling_map); +EXPORT_PER_CPU_SYMBOL(cpu_l2_cache_map); EXPORT_PER_CPU_SYMBOL(cpu_core_map); /* SMP operations for this machine */ @@ -610,6 +612,8 @@ void __init smp_prepare_cpus(unsigned int max_cpus) for_each_possible_cpu(cpu) { zalloc_cpumask_var_node(&per_cpu(cpu_sibling_map, cpu), GFP_KERNEL, cpu_to_node(cpu)); + zalloc_cpumask_var_node(&per_cpu(cpu_l2_cache_map, cpu), + GFP_KERNEL, cpu_to_node(cpu)); zalloc_cpumask_var_node(&per_cpu(cpu_core_map, cpu), GFP_KERNEL, cpu_to_node(cpu)); /* @@ -624,6 +628,7 @@ void __init smp_prepare_cpus(unsigned int max_cpus) /* Init the cpumasks so the boot CPU is related to itself */ cpumask_set_cpu(boot_cpuid, cpu_sibling_mask(boot_cpuid)); + cpumask_set_cpu(boot_cpuid, cpu_l2_cache_mask(boot_cpuid)); cpumask_set_cpu(boot_cpuid, cpu_core_mask(boot_cpuid)); if (smp_ops && smp_ops->probe) @@ -907,6 +912,7 @@ static void remove_cpu_from_masks(int cpu) /* NB: cpu_core_mask is a superset of the others */ for_each_cpu(i, cpu_core_mask(cpu)) { set_cpus_unrelated(cpu, i, cpu_core_mask); + set_cpus_unrelated(cpu, i, cpu_l2_cache_mask); set_cpus_unrelated(cpu, i, cpu_sibling_mask); } } @@ -929,17 +935,22 @@ static void add_cpu_to_masks(int cpu) set_cpus_related(i, cpu, cpu_sibling_mask); /* - * Copy the thread sibling into core sibling mask, and - * add CPUs that share a chip or an L2 to the core sibling - * mask. + * Copy the thread sibling mask into the cache sibling mask + * and mark any CPUs that share an L2 with this CPU. */ for_each_cpu(i, cpu_sibling_mask(cpu)) + set_cpus_related(cpu, i, cpu_l2_cache_mask); + update_mask_by_l2(cpu, cpu_l2_cache_mask); + + /* + * Copy the cache sibling mask into core sibling mask and mark + * any CPUs on the same chip as this CPU. + */ + for_each_cpu(i, cpu_l2_cache_mask(cpu)) set_cpus_related(cpu, i, cpu_core_mask); - if (chipid == -1) { - update_mask_by_l2(cpu, cpu_core_mask); + if (chipid == -1) return; - } for_each_cpu(i, cpu_online_mask) if (cpu_to_chip_id(i) == chipid) |