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gem_userptr_benchmark: Test overlapping bo mmu notifier performance impact

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Current userptr kernel implementation downgrades tracking VMA ranges (real
userspace ones) to an inefficient linear walk for any process which has
instantiated overlapping userptr objects.

This adds a test which shows the performance cliff on, most visibly, generic
userspace mmap(2) and munmap(2) operations between unsync, non-overlapping
and overlapping userptr objects.

Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Thomas Daniel <thomas.daniel@intel.com>
This commit is contained in:
Tvrtko Ursulin 2015-06-01 11:11:15 +01:00 committed by Chris Wilson
parent 9777300846
commit 85ee6e7b36
1 changed files with 75 additions and 24 deletions
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99
benchmarks/gem_userptr_benchmark.c
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@ -180,7 +180,7 @@ static int has_userptr(int fd)
return handle != 0;
}
static const unsigned int nr_bos[] = {0, 1, 10, 100, 1000};
static const unsigned int nr_bos[] = {0, 1, 10, 100, 1000, 10000};
static const unsigned int test_duration_sec = 3;
static volatile unsigned int run_test;
@ -334,7 +334,71 @@ static void test_ptr_write(void *ptr)
printf("%8lu MB/s\n", iter / test_duration_sec * BO_SIZE / 1000000);
}
static void test_impact(int fd)
static void do_impact_tests(unsigned int n, const char *pfix, const char *pfix2,
void *ptr)
{
printf("%s%sptr-read, %5u bos = ", pfix, pfix2, n);
test_ptr_read(ptr);
printf("%s%sptr-write %5u bos = ", pfix, pfix2, n);
test_ptr_write(ptr);
printf("%s%smalloc-free, %5u bos = ", pfix, pfix2, n);
test_malloc_free(0);
printf("%s%smalloc-free-random %5u bos = ", pfix, pfix2, n);
test_malloc_free(1);
printf("%s%smalloc-realloc-free, %5u bos = ", pfix, pfix2, n);
test_malloc_realloc_free(0);
printf("%s%smalloc-realloc-free-random, %5u bos = ", pfix, pfix2, n);
test_malloc_realloc_free(1);
printf("%s%smmap-unmap, %5u bos = ", pfix, pfix2, n);
test_mmap_unmap(0);
printf("%s%smmap-unmap-random, %5u bos = ", pfix, pfix2, n);
test_mmap_unmap(1);
}
static void test_impact_overlap(int fd, const char *prefix)
{
unsigned int total = sizeof(nr_bos) / sizeof(nr_bos[0]);
unsigned int subtest, i;
uint32_t handles[nr_bos[total-1]];
void *block = NULL;
void *ptr;
unsigned char *p;
char buffer[BO_SIZE];
int ret;
for (subtest = 0; subtest < total; subtest++) {
if (nr_bos[subtest] > 0) {
igt_assert(PAGE_SIZE < BO_SIZE);
ret = posix_memalign(&block, PAGE_SIZE,
PAGE_SIZE * nr_bos[subtest] + BO_SIZE);
igt_assert(ret == 0);
for (i = 0, p = block; i < nr_bos[subtest];
i++, p += PAGE_SIZE)
ret = gem_userptr(fd, (uint32_t *)p, BO_SIZE, 0,
&handles[i]);
igt_assert(ret == 0);
}
if (nr_bos[subtest] > 0)
ptr = block;
else
ptr = buffer;
do_impact_tests(nr_bos[subtest], prefix, "overlap-", ptr);
for (i = 0; i < nr_bos[subtest]; i++)
gem_close(fd, handles[i]);
if (block)
free(block);
}
}
static void test_impact(int fd, const char *prefix)
{
unsigned int total = sizeof(nr_bos) / sizeof(nr_bos[0]);
unsigned int subtest, i;
@ -351,26 +415,7 @@ static void test_impact(int fd)
else
ptr = buffer;
printf("ptr-read, %5u bos = ", nr_bos[subtest]);
test_ptr_read(ptr);
printf("ptr-write %5u bos = ", nr_bos[subtest]);
test_ptr_write(ptr);
printf("malloc-free, %5u bos = ", nr_bos[subtest]);
test_malloc_free(0);
printf("malloc-free-random %5u bos = ", nr_bos[subtest]);
test_malloc_free(1);
printf("malloc-realloc-free, %5u bos = ", nr_bos[subtest]);
test_malloc_realloc_free(0);
printf("malloc-realloc-free-random, %5u bos = ", nr_bos[subtest]);
test_malloc_realloc_free(1);
printf("mmap-unmap, %5u bos = ", nr_bos[subtest]);
test_mmap_unmap(0);
printf("mmap-unmap-random, %5u bos = ", nr_bos[subtest]);
test_mmap_unmap(1);
do_impact_tests(nr_bos[subtest], prefix, "no-overlap-", ptr);
for (i = 0; i < nr_bos[subtest]; i++)
free_userptr_bo(fd, handles[i]);
@ -484,7 +529,10 @@ int main(int argc, char **argv)
test_userptr(fd);
igt_subtest("userptr-impact-unsync")
test_impact(fd);
test_impact(fd, "unsync-");
igt_subtest("userptr-impact-unsync-overlap")
test_impact_overlap(fd, "unsync-");
gem_userptr_test_synchronized();
@ -492,7 +540,10 @@ int main(int argc, char **argv)
test_userptr(fd);
igt_subtest("userptr-impact-sync")
test_impact(fd);
test_impact(fd, "sync-");
igt_subtest("userptr-impact-sync-overlap")
test_impact_overlap(fd, "sync-");
igt_exit();