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Bug 761393 - Add telemetry probes to guess the retention time. r=taras

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This commit is contained in:
Paul Adenot 2012-08-26 21:12:36 -07:00
parent 38496cada6
commit 55730cebcd
2 changed files with 20 additions and 2 deletions
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10
layout/base/nsCSSRendering.cpp
View File

@ -48,6 +48,8 @@
#include "mozilla/css/ImageLoader.h"
#include "ImageContainer.h"
#include "mozilla/HashFunctions.h"
#include "mozilla/Telemetry.h"
#include <ctime>
using namespace mozilla;
using namespace mozilla::css;
@ -350,12 +352,13 @@ struct GradientCacheData {
class GradientCache MOZ_FINAL : public nsExpirationTracker<GradientCacheData,4>
{
public:
enum { MAX_GENERATION_MS = 10000};
GradientCache()
: nsExpirationTracker<GradientCacheData, 4>(MAX_GENERATION_MS)
{
mHashEntries.Init();
srand(time(nullptr));
mTimerPeriod = rand() % MAX_GENERATION_MS + 1;
Telemetry::Accumulate(Telemetry::GRADIENT_RETENTION_TIME, mTimerPeriod);
}
virtual void NotifyExpired(GradientCacheData* aObject)
@ -407,6 +410,8 @@ class GradientCache MOZ_FINAL : public nsExpirationTracker<GradientCacheData,4>
}
protected:
uint32_t mTimerPeriod;
static const uint32_t MAX_GENERATION_MS = 10000;
/**
* FIXME use nsTHashtable to avoid duplicating the GradientCacheKey.
* https://bugzilla.mozilla.org/show_bug.cgi?id=761393#c47
@ -1997,6 +2002,7 @@ nsCSSRendering::PaintGradient(nsPresContext* aPresContext,
const nsRect& aFillArea)
{
SAMPLE_LABEL("nsCSSRendering", "PaintGradient");
Telemetry::AutoTimer<Telemetry::GRADIENT_DURATION, Telemetry::Microsecond> gradientTimer;
if (aOneCellArea.IsEmpty())
return;

12
toolkit/components/telemetry/Histograms.json
View File

@ -405,6 +405,18 @@
"n_buckets": 111,
"description": "System font fallback script"
},
"GRADIENT_DURATION": {
"kind": "exponential",
"high":"50000000",
"n_buckets":20,
"description": "Gradient generation time (us)"
},
"GRADIENT_RETENTION_TIME": {
"kind": "linear",
"high": "10000",
"n_buckets":20,
"description": "Maximum retention time for the gradient cache. (ms)"
},
"STARTUP_CACHE_AGE_HOURS": {
"kind": "exponential",
"high": "3000",