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Remove telemetry probes to get detailed disk cache hit rate.

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Tag #21.
This commit is contained in:
wolfbeast 2018-09-30 04:39:37 +02:00 • committed by Roy Tam
commit b882e7c6be
7 changed files with 0 additions and 212 deletions
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59
netwerk/cache2/CacheFileUtils.h
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@ -10,7 +10,6 @@
#include "nsString.h"
#include "nsTArray.h"
#include "mozilla/StaticMutex.h"
#include "mozilla/TimeStamp.h"
class nsILoadContextInfo;
class nsACString;
@ -90,64 +89,6 @@ private:
nsTArray<ValidityPair> mMap;
};
class DetailedCacheHitTelemetry {
public:
enum ERecType {
HIT = 0,
MISS = 1
};
static void AddRecord(ERecType aType, TimeStamp aLoadStart);
private:
class HitRate {
public:
HitRate();
void AddRecord(ERecType aType);
// Returns the bucket index that the current hit rate falls into according
// to the given aNumOfBuckets.
uint32_t GetHitRateBucket(uint32_t aNumOfBuckets) const;
uint32_t Count();
void Reset();
private:
uint32_t mHitCnt;
uint32_t mMissCnt;
};
// Group the hits and misses statistics by cache files count ranges (0-5000,
// 5001-10000, ... , 95001- )
static const uint32_t kRangeSize = 5000;
static const uint32_t kNumOfRanges = 20;
// Use the same ranges to report an average hit rate. Report the hit rates
// (and reset the counters) every kTotalSamplesReportLimit samples.
static const uint32_t kTotalSamplesReportLimit = 1000;
// Report hit rate for a given cache size range only if it contains
// kHitRateSamplesReportLimit or more samples. This limit should avoid
// reporting a biased statistics.
static const uint32_t kHitRateSamplesReportLimit = 500;
// All hit rates are accumulated in a single telemetry probe, so to use
// a sane number of enumerated values the hit rate is divided into buckets
// instead of using a percent value. This constant defines number of buckets
// that we divide the hit rates into. I.e. we'll report ranges 0%-5%, 5%-10%,
// 10-%15%, ...
static const uint32_t kHitRateBuckets = 20;
// Protects sRecordCnt and sHitStats calls.
static StaticMutex sLock;
// Counter of samples that is compared against kTotalSamplesReportLimit.
static uint32_t sRecordCnt;
// Hit rate statistics for every cache size range.
static HitRate sHRStats[kNumOfRanges];
};
void
FreeBuffer(void *aBuf);