This patch introduces fragmentation in the address range
and measures time taken by 10k and 20k insertions. ig_frag()
will fail if time taken by 20k insertions takes more than 4 times
of 10k insertions as we know that insertions scale quadratically.
Also tolerate 10% error because of kernel scheduler's jitters.
Output:
<snip>
[ 8092.653518] drm_mm: Testing DRM range manger (struct drm_mm), with random_seed=0x9bfb4117 max_iterations=8192 max_prime=128
[ 8092.653520] drm_mm: igt_sanitycheck - ok!
[ 8092.653525] igt_debug 0x0000000000000000-0x0000000000000200: 512: free
[ 8092.653526] igt_debug 0x0000000000000200-0x0000000000000600: 1024: used
[ 8092.653527] igt_debug 0x0000000000000600-0x0000000000000a00: 1024: free
[ 8092.653528] igt_debug 0x0000000000000a00-0x0000000000000e00: 1024: used
[ 8092.653529] igt_debug 0x0000000000000e00-0x0000000000001000: 512: free
[ 8092.653529] igt_debug total: 4096, used 2048 free 2048
[ 8112.569813] drm_mm: best fragmented insert of 10000 and 20000 insertions took 504 and 1996 msecs
[ 8112.723254] drm_mm: bottom-up fragmented insert of 10000 and 20000 insertions took 44 and 108 msecs
[ 8112.813212] drm_mm: top-down fragmented insert of 10000 and 20000 insertions took 40 and 44 msecs
[ 8112.847733] drm_mm: evict fragmented insert of 10000 and 20000 insertions took 8 and 20 msecs
<snip>
Signed-off-by: Nirmoy Das <nirmoy.das@xxxxxxx>
---
drivers/gpu/drm/selftests/drm_mm_selftests.h | 1 +
drivers/gpu/drm/selftests/test-drm_mm.c | 73 ++++++++++++++++++++
2 files changed, 74 insertions(+)
diff --git a/drivers/gpu/drm/selftests/drm_mm_selftests.h b/drivers/gpu/drm/selftests/drm_mm_selftests.h
index 6b943ea1c57d..8c87c964176b 100644
--- a/drivers/gpu/drm/selftests/drm_mm_selftests.h
+++ b/drivers/gpu/drm/selftests/drm_mm_selftests.h
@@ -14,6 +14,7 @@ selftest(insert, igt_insert)
selftest(replace, igt_replace)
selftest(insert_range, igt_insert_range)
selftest(align, igt_align)
+selftest(frag, igt_frag)
selftest(align32, igt_align32)
selftest(align64, igt_align64)
selftest(evict, igt_evict)
diff --git a/drivers/gpu/drm/selftests/test-drm_mm.c b/drivers/gpu/drm/selftests/test-drm_mm.c
index 9aabe82dcd3a..05d8f3659b4d 100644
--- a/drivers/gpu/drm/selftests/test-drm_mm.c
+++ b/drivers/gpu/drm/selftests/test-drm_mm.c
@@ -1033,6 +1033,79 @@ static int igt_insert_range(void *ignored)
return 0;
}
+static int get_insert_time(unsigned int num_insert,
+ const struct insert_mode *mode)
+{
+ struct drm_mm mm;
+ struct drm_mm_node *nodes, *node, *next;
+ unsigned int size = 4096, align = 8192;
+ unsigned long start;
+ unsigned int i;
+ int ret = -EINVAL;
+
+ drm_mm_init(&mm, 1, U64_MAX - 2);
+ nodes = vzalloc(array_size(num_insert, sizeof(*nodes)));
+ if (!nodes)
+ goto err;
+
+ start = jiffies;
+ for (i = 0; i < num_insert; i++) {
+ if (!expect_insert(&mm, &nodes[i], size, align, i, mode)) {
+ pr_err("%s insert failed\n", mode->name);
+ goto out;
+ }
+ }
+
+ ret = jiffies_to_msecs(jiffies - start);
+out:
+ drm_mm_for_each_node_safe(node, next, &mm)
+ drm_mm_remove_node(node);
+ drm_mm_takedown(&mm);
+ vfree(nodes);
+err:
+ return ret;
+
+}
+
+static int igt_frag(void *ignored)
+{
+ const struct insert_mode *mode;
+ unsigned int insert_time1, insert_time2;
+ unsigned int insert_size = 10000;
+ unsigned int scale_factor = 4;
+ /* tolerate 10% excess insertion duration */
+ unsigned int error_factor = 110;
+ int ret = -EINVAL;
+
+ for (mode = insert_modes; mode->name; mode++) {
+ unsigned int expected_time;
+
+ insert_time1 = get_insert_time(insert_size, mode);
+ if (insert_time1 < 0)
+ goto err;
+
+ insert_time2 = get_insert_time((insert_size * 2), mode);
+ if (insert_time2 < 0)
+ goto err;
+
+ expected_time = (scale_factor * insert_time1 *
+ error_factor)/100;
+ if (insert_time2 > expected_time) {
+ pr_err("%s fragmented insert took more %u msecs\n",
+ mode->name, insert_time2 - expected_time);
+ goto err;
+ }
+
+ pr_info("%s fragmented insert of %u and %u insertions took %u and %u msecs\n",
+ mode->name, insert_size, insert_size * 2, insert_time1,
+ insert_time2);
+ }
+
+ ret = 0;
+err:
+ return ret;
+}
+
static int igt_align(void *ignored)
{
const struct insert_mode *mode;
--
2.26.2
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