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igt/gem_fence_upload: Exercise contention on the fault handler

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Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
This commit is contained in:
Chris Wilson 2014-06-13 15:46:33 +01:00
parent 6903ab04e5
commit bfede4ed2b
2 changed files with 82 additions and 4 deletions
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1
tests/.gitignore vendored
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@ -42,6 +42,7 @@ gem_exec_params
gem_exec_parse
gem_fd_exhaustion
gem_fence_thrash
gem_fence_upload
gem_fenced_exec_thrash
gem_flink
gem_flink_race

85
tests/gem_fence_upload.c
View File

@ -251,17 +251,94 @@ static void thread_performance(unsigned mask)
igt_assert(tiled[1] > 0.75 * tiled[0]);
}
struct thread_contention {
pthread_t thread;
uint32_t handle;
int loops, fd;
};
static void *no_contention(void *closure)
{
struct thread_contention *t = closure;
int n;
for (n = 0; n < t->loops; n++) {
uint32_t *ptr = gem_mmap(t->fd, t->handle, OBJECT_SIZE, PROT_READ | PROT_WRITE);
memset(ptr + (rand() % 256) * 4096 / 4, 0, 4096);
munmap(ptr, OBJECT_SIZE);
}
return NULL;
}
static void thread_contention(void)
{
const int loops = 4096;
int n, count;
int fd, num_fences;
double linear[2], tiled[2];
fd = drm_open_any();
num_fences = gem_available_fences(fd);
igt_require(num_fences > 0);
for (count = 1; count < 4*num_fences; count *= 2) {
struct timeval start, end;
struct thread_contention threads[count];
for (n = 0; n < count; n++) {
threads[n].handle = gem_create(fd, OBJECT_SIZE);
threads[n].loops = loops;
threads[n].fd = fd;
}
gettimeofday(&start, NULL);
for (n = 0; n < count; n++)
pthread_create(&threads[n].thread, NULL, no_contention, &threads[n]);
for (n = 0; n < count; n++)
pthread_join(threads[n].thread, NULL);
gettimeofday(&end, NULL);
linear[count != 2] = count * loops / elapsed(&start, &end) / (OBJECT_SIZE / 4096);
printf("Contended upload rate for %d threads: %7.3fMiB/s\n",
count, linear[count != 2]);
for (n = 0; n < count; n++)
gem_set_tiling(fd, threads[n].handle, I915_TILING_X, 1024);
gettimeofday(&start, NULL);
for (n = 0; n < count; n++)
pthread_create(&threads[n].thread, NULL, no_contention, &threads[n]);
for (n = 0; n < count; n++)
pthread_join(threads[n].thread, NULL);
gettimeofday(&end, NULL);
tiled[count != 2] = count * loops / elapsed(&start, &end) / (OBJECT_SIZE / 4096);
printf("Contended upload rate for %d threads: %7.3fMiB/s\n",
count, tiled[count != 2]);
for (n = 0; n < count; n++) {
gem_close(fd, threads[n].handle);
}
}
errno = 0;
igt_assert(linear[1] > 0.75 * linear[0]);
igt_assert(tiled[1] > 0.75 * tiled[0]);
}
igt_main
{
igt_skip_on_simulation();
igt_subtest("performance")
performance();
igt_subtest("threaded-performance-read")
igt_subtest("thread-contention")
thread_contention();
igt_subtest("thread-performance-read")
thread_performance(READ);
igt_subtest("threaded-performance-write")
igt_subtest("thread-performance-write")
thread_performance(WRITE);
igt_subtest("threaded-performance-both")
igt_subtest("thread-performance-both")
thread_performance(READ | WRITE);
}