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benchmarks: Measure mmap fault latency

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Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
This commit is contained in:
Chris Wilson 2015-07-24 16:34:26 +01:00
parent e984d4965f
commit 42a386b83b
1 changed files with 16 additions and 3 deletions
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19
benchmarks/gem_mmap.c
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@ -56,7 +56,7 @@ int main(int argc, char **argv)
{ {
int fd = drm_open_any(); int fd = drm_open_any();
enum map {CPU, GTT, WC} map = CPU; enum map {CPU, GTT, WC} map = CPU;
enum dir {READ, WRITE, CLEAR} dir = READ; enum dir {READ, WRITE, CLEAR, FAULT} dir = READ;
int tiling = I915_TILING_NONE; int tiling = I915_TILING_NONE;
void *buf = malloc(OBJECT_SIZE); void *buf = malloc(OBJECT_SIZE);
uint32_t handle; uint32_t handle;
@ -84,6 +84,8 @@ int main(int argc, char **argv)
dir = WRITE; dir = WRITE;
else if (strcmp(optarg, "clear") == 0) else if (strcmp(optarg, "clear") == 0)
dir = CLEAR; dir = CLEAR;
else if (strcmp(optarg, "fault") == 0)
dir = FAULT;
else else
abort(); abort();
break; break;
@ -146,12 +148,23 @@ int main(int argc, char **argv)
for (n = 0; n < reps; n++) { for (n = 0; n < reps; n++) {
struct timespec start, end; struct timespec start, end;
int page;
clock_gettime(CLOCK_MONOTONIC, &start); clock_gettime(CLOCK_MONOTONIC, &start);
if (dir == CLEAR) switch (dir) {
case CLEAR:
memset(dst, 0, size); memset(dst, 0, size);
else break;
case FAULT:
for (page = 0; page < OBJECT_SIZE; page += 4096) {
uint32_t *x = (uint32_t *)ptr + page/4;
page += *x; /* should be zero! */
}
break;
default:
memcpy(dst, src, size); memcpy(dst, src, size);
break;
}
clock_gettime(CLOCK_MONOTONIC, &end); clock_gettime(CLOCK_MONOTONIC, &end);
igt_stats_push(&stats, elapsed(&start, &end)); igt_stats_push(&stats, elapsed(&start, &end));