From: Marcelo Tosatti <mtosa...@redhat.com> So one can measure SMP overhead.
Signed-off-by: Marcelo Tosatti <mtosa...@redhat.com> Signed-off-by: Avi Kivity <a...@redhat.com> diff --git a/kvm/user/test/x86/vmexit.c b/kvm/user/test/x86/vmexit.c index e7cb5ef..5455919 100644 --- a/kvm/user/test/x86/vmexit.c +++ b/kvm/user/test/x86/vmexit.c @@ -80,22 +80,38 @@ static struct test { void (*func)(void); const char *name; int (*valid)(void); + int parallel; } tests[] = { - { cpuid, "cpuid", }, - { vmcall, "vmcall", }, - { mov_from_cr8, "mov_from_cr8" }, - { mov_to_cr8, "mov_to_cr8" }, - { ipi, "ipi", is_smp }, - { ipi_halt, "ipi+halt", is_smp }, + { cpuid, "cpuid", .parallel = 1, }, + { vmcall, "vmcall", .parallel = 1, }, + { mov_from_cr8, "mov_from_cr8", .parallel = 1, }, + { mov_to_cr8, "mov_to_cr8" , .parallel = 1, }, + { ipi, "ipi", is_smp, .parallel = 0, }, + { ipi_halt, "ipi+halt", is_smp, .parallel = 0, }, }; +unsigned iterations; +volatile int nr_cpus_done; + +static void run_test(void *_func) +{ + int i; + void (*func)(void) = _func; + + for (i = 0; i < iterations; ++i) + func(); + + nr_cpus_done++; +} + static void do_test(struct test *test) { int i; unsigned long long t1, t2; - unsigned iterations = 32; void (*func)(void) = test->func; + iterations = 32; + if (test->valid && !test->valid()) { printf("%s (skipped)\n", test->name); return; @@ -104,8 +120,17 @@ static void do_test(struct test *test) do { iterations *= 2; t1 = rdtsc(); - for (i = 0; i < iterations; ++i) - func(); + + if (!test->parallel) { + for (i = 0; i < iterations; ++i) + func(); + } else { + nr_cpus_done = 0; + for (i = cpu_count(); i > 0; i--) + on_cpu_async(i-1, run_test, func); + while (nr_cpus_done < cpu_count()) + ; + } t2 = rdtsc(); } while ((t2 - t1) < GOAL); printf("%s %d\n", test->name, (int)((t2 - t1) / iterations)); -- To unsubscribe from this list: send the line "unsubscribe kvm-commits" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html