[PATCH v2 04/12] KVM: selftests: Return the target CPU from pin_task_to_random_cpu()
Sean Christopherson <[email protected]>
| Newsgroups | org.kernel.vger.kvm,dev.linux.lists.kvmarm,org.infradead.lists.linux-arm-kernel,org.kernel.vger.linux-kernel |
|---|---|
| Message-ID | <[email protected]> |
When pinning a task to a random CPU, return which CPU the task was pinned to so that the caller can do things like avoid running other tasks on the target CPU. Signed-off-by: Sean Christopherson <[email protected]> --- tools/testing/selftests/kvm/include/kvm_util.h | 2 +- tools/testing/selftests/kvm/lib/kvm_util.c | 5 +++-- 2 files changed, 4 insertions(+), 3 deletions(-) diff --git a/tools/testing/selftests/kvm/include/kvm_util.h b/tools/testing/selftests/kvm/include/kvm_util.h index b39e713c30a4..61d72e1e7601 100644 --- a/tools/testing/selftests/kvm/include/kvm_util.h +++ b/tools/testing/selftests/kvm/include/kvm_util.h @@ -1094,7 +1094,7 @@ static inline void pin_task_to_cpu(pthread_t task, int cpu) TEST_ASSERT(!r, "Failed to set thread affinity to pCPU '%u'", cpu); } -void pin_task_to_random_cpu(pthread_t task, cpu_set_t *possible_cpus); +int pin_task_to_random_cpu(pthread_t task, cpu_set_t *possible_cpus); static inline int pin_task_to_any_cpu(pthread_t task) { diff --git a/tools/testing/selftests/kvm/lib/kvm_util.c b/tools/testing/selftests/kvm/lib/kvm_util.c index 3794575d2ca0..af2bad0553f9 100644 --- a/tools/testing/selftests/kvm/lib/kvm_util.c +++ b/tools/testing/selftests/kvm/lib/kvm_util.c @@ -668,7 +668,7 @@ void kvm_print_vcpu_pinning_help(void) " (default: no pinning)\n", name, name); } -void pin_task_to_random_cpu(pthread_t task, cpu_set_t *possible_cpus) +int pin_task_to_random_cpu(pthread_t task, cpu_set_t *possible_cpus) { int target_idx; int nr_cpus; @@ -682,11 +682,12 @@ void pin_task_to_random_cpu(pthread_t task, cpu_set_t *possible_cpus) for (cpu = 0; cpu < CPU_SETSIZE; cpu++) { if (CPU_ISSET(cpu, possible_cpus) && target_idx-- == 0) { pin_task_to_cpu(task, cpu); - return; + return cpu; } } TEST_FAIL("Failed to find random CPU in possible_cpus"); + return -1; } void kvm_parse_vcpu_pinning(const char *pcpus_string, u32 vcpu_to_pcpu[], -- 2.55.0.508.g3f0d502094-goog