From: Avi Kivity <[email protected]> This test round-robins executions among all cpus. If overcommitted, it will execute at the rate the host switches vcpu contexts.
Signed-off-by: Avi Kivity <[email protected]> diff --git a/x86/vmexit.c b/x86/vmexit.c index 31858ea..875caa3 100644 --- a/x86/vmexit.c +++ b/x86/vmexit.c @@ -12,6 +12,8 @@ static unsigned int inl(unsigned short port) #define GOAL (1ull << 30) +static int nr_cpus; + #ifdef __x86_64__ # define R "r" #else @@ -79,6 +81,27 @@ static void inl_pmtimer(void) inl(0xb008); } +static void ple_round_robin(void) +{ + struct counter { + volatile int n1; + int n2; + } __attribute__((aligned(64))); + static struct counter counters[64] = { { -1, 0 } }; + int me = smp_id(); + int you; + volatile struct counter *p = &counters[me]; + + while (p->n1 == p->n2) + asm volatile ("pause"); + + p->n2 = p->n1; + you = me + 1; + if (you == nr_cpus) + you = 0; + ++counters[you].n1; +} + static struct test { void (*func)(void); const char *name; @@ -94,6 +117,7 @@ static struct test { { inl_pmtimer, "inl_from_pmtimer", .parallel = 1, }, { ipi, "ipi", is_smp, .parallel = 0, }, { ipi_halt, "ipi+halt", is_smp, .parallel = 0, }, + { ple_round_robin, "ple-round-robin", .parallel = 1 }, }; unsigned iterations; @@ -167,6 +191,7 @@ int main(int ac, char **av) int i; smp_init(); + nr_cpus = cpu_count(); for (i = cpu_count(); i > 0; i--) on_cpu(i-1, enable_nx, 0); -- To unsubscribe from this list: send the line "unsubscribe kvm-commits" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
