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Commit e70c5754 authored by John Reck's avatar John Reck
Browse files

Add percentiles 

Change-Id: Ieb6badd177bb6f67dda199dfcb3e0f483c8c4e59
parent 38d909a5

libs/hwui/JankTracker.cpp

+24 −1
Original line number Diff line number Diff line
@@ -15,6 +15,7 @@ 
 */

#include "JankTracker.h"



#include <algorithm>

#include <cstdio>

#include <inttypes.h>
@@ -95,7 +96,12 @@ void JankTracker::addFrame(const FrameInfo& frame) { 
    // Fast-path for jank-free frames

    int64_t totalDuration =

            frame[FrameInfoIndex::kFrameCompleted] - frame[FrameInfoIndex::kIntendedVsync];

    uint32_t framebucket = std::min(

            static_cast<typeof sizeof(mFrameCounts)>(ns2ms(totalDuration)),

            sizeof(mFrameCounts) / sizeof(mFrameCounts[0]));

    // Keep the fast path as fast as possible.

    if (CC_LIKELY(totalDuration < mFrameInterval)) {

        mFrameCounts[framebucket]++;

        return;

    }
@@ -103,6 +109,7 @@ void JankTracker::addFrame(const FrameInfo& frame) { 
        return;

    }



    mFrameCounts[framebucket]++;

    mJankFrameCount++;



    for (int i = 0; i < NUM_BUCKETS; i++) {
@@ -119,6 +126,9 @@ void JankTracker::dump(int fd) { 
    fprintf(file, "\n  Total frames rendered: %u", mTotalFrameCount);

    fprintf(file, "\n  Janky frames: %u (%.2f%%)", mJankFrameCount,

            (float) mJankFrameCount / (float) mTotalFrameCount * 100.0f);

    fprintf(file, "\n  90th percentile: %ums", findPercentile(90));

    fprintf(file, "\n  95th percentile: %ums", findPercentile(95));

    fprintf(file, "\n  99th percentile: %ums", findPercentile(99));

    for (int i = 0; i < NUM_BUCKETS; i++) {

        fprintf(file, "\n   Number %s: %u", JANK_TYPE_NAMES[i], mBuckets[i].count);

    }
@@ -127,10 +137,23 @@ void JankTracker::dump(int fd) { 
}



void JankTracker::reset() {

    memset(mBuckets, 0, sizeof(JankBucket) * NUM_BUCKETS);

    memset(mBuckets, 0, sizeof(mBuckets));

    memset(mFrameCounts, 0, sizeof(mFrameCounts));

    mTotalFrameCount = 0;

    mJankFrameCount = 0;

}



uint32_t JankTracker::findPercentile(int percentile) {

    int pos = percentile * mTotalFrameCount / 100;

    int remaining = mTotalFrameCount - pos;

    for (int i = sizeof(mFrameCounts) / sizeof(mFrameCounts[0]) - 1; i >= 0; i--) {

        remaining -= mFrameCounts[i];

        if (remaining <= 0) {

            return i;

        }

    }

    return 0;

}



} /* namespace uirenderer */

} /* namespace android */

libs/hwui/JankTracker.h

+3 −0
Original line number Diff line number Diff line
@@ -54,8 +54,11 @@ public: 
    void reset();



private:

    uint32_t findPercentile(int p);



    JankBucket mBuckets[NUM_BUCKETS];

    int64_t mThresholds[NUM_BUCKETS];

    uint32_t mFrameCounts[128];



    int64_t mFrameInterval;

    uint32_t mTotalFrameCount;