[TimeStats] Expose pathological latch counters
* Missed latch because the acquire fence didn't fire
* Latched early because the desired present time was bad
Bug: 135478131
Test: libsurfaceflinger_unittest
Change-Id: Id02a62c222cb497c05889dd198be5fea6d64893a
diff --git a/services/surfaceflinger/TimeStats/TimeStats.h b/services/surfaceflinger/TimeStats/TimeStats.h
index 71f06af..a2843c8 100644
--- a/services/surfaceflinger/TimeStats/TimeStats.h
+++ b/services/surfaceflinger/TimeStats/TimeStats.h
@@ -70,6 +70,18 @@
virtual void setPostTime(int32_t layerId, uint64_t frameNumber, const std::string& layerName,
nsecs_t postTime) = 0;
virtual void setLatchTime(int32_t layerId, uint64_t frameNumber, nsecs_t latchTime) = 0;
+ // Reasons why latching a particular buffer may be skipped
+ enum class LatchSkipReason {
+ // If the acquire fence did not fire on some devices we skip latching
+ // the buffer until the fence fires.
+ LateAcquire,
+ };
+ // Increments the counter of skipped latch buffers.
+ virtual void incrementLatchSkipped(int32_t layerId, LatchSkipReason reason) = 0;
+ // Increments the counter of bad desired present times for this layer.
+ // Bad desired present times are "implausible" and cause SurfaceFlinger to
+ // latch a buffer immediately to avoid stalling.
+ virtual void incrementBadDesiredPresent(int32_t layerId) = 0;
virtual void setDesiredTime(int32_t layerId, uint64_t frameNumber, nsecs_t desiredTime) = 0;
virtual void setAcquireTime(int32_t layerId, uint64_t frameNumber, nsecs_t acquireTime) = 0;
virtual void setAcquireFence(int32_t layerId, uint64_t frameNumber,
@@ -116,6 +128,8 @@
// fences to signal, but rather waiting to receive those fences/timestamps.
int32_t waitData = -1;
uint32_t droppedFrames = 0;
+ uint32_t lateAcquireFrames = 0;
+ uint32_t badDesiredPresentFrames = 0;
TimeRecord prevTimeRecord;
std::deque<TimeRecord> timeRecords;
};
@@ -200,6 +214,8 @@
void setPostTime(int32_t layerId, uint64_t frameNumber, const std::string& layerName,
nsecs_t postTime) override;
void setLatchTime(int32_t layerId, uint64_t frameNumber, nsecs_t latchTime) override;
+ void incrementLatchSkipped(int32_t layerId, LatchSkipReason reason) override;
+ void incrementBadDesiredPresent(int32_t layerId) override;
void setDesiredTime(int32_t layerId, uint64_t frameNumber, nsecs_t desiredTime) override;
void setAcquireTime(int32_t layerId, uint64_t frameNumber, nsecs_t acquireTime) override;
void setAcquireFence(int32_t layerId, uint64_t frameNumber,