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igt/gem_concurrent_blit: Purge the libdrm caches before cloning

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When forking, the entire VM is cloned including the VMA backed by GEM
objects from the libdrm buffer cache. This is not only slow, but can also
cause the system to exceed the maximum number of VMA and premature test
failure.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
This commit is contained in:
Chris Wilson 2016-04-10 20:44:58 +01:00
parent e8bcd678a6
commit c46f3c341c
1 changed files with 29 additions and 10 deletions
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39
tests/gem_concurrent_all.c
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@ -650,7 +650,8 @@ static int read_sysctl(const char *path)
FILE *file = fopen(path, "r");
int max = 0;
if (file) {
fscanf(file, "%d", &max);
if (fscanf(file, "%d", &max) != 1)
max = 0; /* silence! */
fclose(file);
}
return max;
@ -757,6 +758,27 @@ static void buffers_create(struct buffers *b)
b->snoop = snoop_create_bo(b);
}
static void buffers_reset(struct buffers *b, bool enable_reuse)
{
buffers_destroy(b);
igt_assert(b->count == 0);
igt_assert(b->tmp);
igt_assert(b->src);
igt_assert(b->dst);
intel_batchbuffer_free(b->batch);
drm_intel_bufmgr_destroy(b->bufmgr);
b->bufmgr = drm_intel_bufmgr_gem_init(fd, 4096);
igt_assert(b->bufmgr);
if (enable_reuse)
drm_intel_bufmgr_gem_enable_reuse(b->bufmgr);
b->batch = intel_batchbuffer_alloc(b->bufmgr, devid);
igt_assert(b->batch);
}
static void buffers_fini(struct buffers *b)
{
if (b->bufmgr == NULL)
@ -1301,20 +1323,17 @@ static void __run_forked(struct buffers *buffers,
do_hang do_hang_func)
{
int _num_buffers = buffers->num_buffers;
_num_buffers /= num_children;
_num_buffers += MIN_BUFFERS;
buffers_destroy(buffers);
/* purge the libdrm caches before cloing the process */
buffers_reset(buffers, true);
igt_fork(child, num_children) {
/* recreate process local variables */
fd = drm_open_driver(DRIVER_INTEL);
buffers_init(buffers, buffers->name,
buffers->create, buffers->mode,
buffers->size, _num_buffers, fd, true);
buffers->num_buffers /= num_children;
buffers->num_buffers += MIN_BUFFERS;
buffers_reset(buffers, true);
buffers_create(buffers);
igt_interruptible(interrupt) {