[Intel-gfx] [PATCH i-g-t] i915/i915_pm_rc6_residency: Show where the time is spent

[Chris Wilson]

Sometimes the bg_load only wakes up once or twice in 3s. That's
just unbelievable, so include some measurements to see how long the
load spends in submission & waiting.

Signed-off-by: Chris Wilson <ch...@chris-wilson.co.uk>
---
 tests/i915/i915_pm_rc6_residency.c | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/tests/i915/i915_pm_rc6_residency.c 
b/tests/i915/i915_pm_rc6_residency.c
index cd1a6c8d6..15efba186 100644
--- a/tests/i915/i915_pm_rc6_residency.c
+++ b/tests/i915/i915_pm_rc6_residency.c
@@ -304,11 +304,13 @@ static void bg_load(int i915, unsigned int flags, 
unsigned long *ctl)
 
        sigaction(SIGINT, &act, NULL);
        do {
+               uint64_t submit, wait, elapsed;
                struct timespec tv = {};
 
                igt_nsec_elapsed(&tv);
 
                gem_execbuf(i915, &execbuf);
+               submit = igt_nsec_elapsed(&tv);
                if (flags & WAITBOOST) {
                        gem_sync(i915, obj.handle);
                        if (flags & ONCE)
@@ -317,6 +319,7 @@ static void bg_load(int i915, unsigned int flags, unsigned 
long *ctl)
                        while (gem_bo_busy(i915, obj.handle))
                                usleep(0);
                }
+               wait = igt_nsec_elapsed(&tv);
                ctl[1]++;
 
                /*
@@ -330,8 +333,15 @@ static void bg_load(int i915, unsigned int flags, unsigned 
long *ctl)
                if (!gem_has_execlists(i915))
                        igt_drop_caches_set(i915, DROP_IDLE);
 
+               elapsed = igt_nsec_elapsed(&tv);
+               igt_info("Pulse took %.3fms (submit %.1fus, wait %.1fus, idle 
%.1fus)\n",
+                        1e-6 * elapsed,
+                        1e-3 * submit,
+                        1e-3 * (wait - submit),
+                        1e-3 * (elapsed - wait));
+
                /* aim for ~1% busy */
-               usleep(min(igt_nsec_elapsed(&tv) / 10, 50 * 1000));
+               usleep(min(elapsed / 10, 50 * 1000));
        } while (!READ_ONCE(*ctl));
 }
 
-- 
2.26.0

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