lk/linux-kernel-test
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

x86, amd: Use compute unit information to determine thread siblings

Browse Source 
This information is vital for different load balancing policies.

Signed-off-by: Andreas Herrmann <andreas.herrmann3@amd.com>
LKML-Reference: <20100930124156.GF20545@loge.amd.com>
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
This commit is contained in:
Andreas Herrmann 2010-09-30 14:41:56 +02:00 committed by H. Peter Anvin
parent 6057b4d331
commit d4fbe4f035
1 changed files with 20 additions and 8 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

28
arch/x86/kernel/smpboot.c
View File

@ -397,6 +397,19 @@ void __cpuinit smp_store_cpu_info(int id)
identify_secondary_cpu(c);
}
static void __cpuinit link_thread_siblings(int cpu1, int cpu2)
{
struct cpuinfo_x86 *c1 = &cpu_data(cpu1);
struct cpuinfo_x86 *c2 = &cpu_data(cpu2);
cpumask_set_cpu(cpu1, cpu_sibling_mask(cpu2));
cpumask_set_cpu(cpu2, cpu_sibling_mask(cpu1));
cpumask_set_cpu(cpu1, cpu_core_mask(cpu2));
cpumask_set_cpu(cpu2, cpu_core_mask(cpu1));
cpumask_set_cpu(cpu1, c2->llc_shared_map);
cpumask_set_cpu(cpu2, c1->llc_shared_map);
}
void __cpuinit set_cpu_sibling_map(int cpu)
{
@ -409,14 +422,13 @@ void __cpuinit set_cpu_sibling_map(int cpu)
for_each_cpu(i, cpu_sibling_setup_mask) {
struct cpuinfo_x86 *o = &cpu_data(i);
if (c->phys_proc_id == o->phys_proc_id &&
c->cpu_core_id == o->cpu_core_id) {
cpumask_set_cpu(i, cpu_sibling_mask(cpu));
cpumask_set_cpu(cpu, cpu_sibling_mask(i));
cpumask_set_cpu(i, cpu_core_mask(cpu));
cpumask_set_cpu(cpu, cpu_core_mask(i));
cpumask_set_cpu(i, c->llc_shared_map);
cpumask_set_cpu(cpu, o->llc_shared_map);
if (cpu_has(c, X86_FEATURE_TOPOEXT)) {
if (c->phys_proc_id == o->phys_proc_id &&
c->compute_unit_id == o->compute_unit_id)
link_thread_siblings(cpu, i);
} else if (c->phys_proc_id == o->phys_proc_id &&
c->cpu_core_id == o->cpu_core_id) {
link_thread_siblings(cpu, i);
}
}
} else {