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uti: Workaround not to share CPU with OpenMP threads

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* Assign uti thread to the last idle CPU so that it's not shared with
  an OpenMP thread

Change-Id: Ia42cae056ce81fde9b6dab6286b39a52f3c9e172
This commit is contained in:
Masamichi Takagi
2018-09-03 18:08:03 +09:00
parent dbba7dea18
commit 5cb8a1f10f
8 changed files with 34 additions and 14 deletions
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2
arch/arm64/kernel/syscall.c
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@@ -58,7 +58,7 @@ static int cpuid_head = 1;
extern int num_processors;
int obtain_clone_cpuid(cpu_set_t *cpu_set) {
int obtain_clone_cpuid(cpu_set_t *cpu_set, int use_last) {
int min_queue_len = -1;
int i, min_cpu = -1;

16
arch/x86_64/kernel/syscall.c
View File

@@ -90,11 +90,11 @@ static ptrdiff_t vdso_offset;
extern int num_processors;
int obtain_clone_cpuid(cpu_set_t *cpu_set) {
int obtain_clone_cpuid(cpu_set_t *cpu_set, int use_last) {
int min_queue_len = -1;
int cpu, min_cpu = -1;
int cpu, min_cpu = -1, uti_cpu = -1;
unsigned long irqstate;
irqstate = ihk_mc_spinlock_lock(&runq_reservation_lock);
/* Find the first allowed core with the shortest run queue */
for (cpu = 0; cpu < num_processors; ++cpu) {
@@ -109,12 +109,20 @@ int obtain_clone_cpuid(cpu_set_t *cpu_set) {
min_queue_len = v->runq_len + v->runq_reserved;
min_cpu = cpu;
}
ihk_mc_spinlock_unlock_noirq(&v->runq_lock);
/* Record the last tie CPU */
if (min_cpu != cpu && v->runq_len + v->runq_reserved == min_queue_len) {
uti_cpu = cpu;
}
dkprintf("%s: cpu=%d,runq_len=%d,runq_reserved=%d,min_cpu=%d,uti_cpu=%d\n", __FUNCTION__, cpu, v->runq_len, v->runq_reserved, min_cpu, uti_cpu);
ihk_mc_spinlock_unlock_noirq(&v->runq_lock);
#if 0
if (min_queue_len == 0)
break;
#endif
}
min_cpu = use_last ? uti_cpu : min_cpu;
if (min_cpu != -1) {
if (get_cpu_local_var(min_cpu)->status != CPU_STATUS_RESERVED)
get_cpu_local_var(min_cpu)->status = CPU_STATUS_RESERVED;