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Bug 764299 (Part 3) - Add memory reporting to the surface cache. r=njn

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This commit is contained in:
Seth Fowler 2013-10-21 18:10:45 +02:00
parent 4076d6db32
commit 9c00cfe937
1 changed files with 81 additions and 12 deletions
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93
image/src/SurfaceCache.cpp
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@ -61,13 +61,21 @@ private:
namespace mozilla {
namespace image {
class CachedSurface;
class SurfaceCacheImpl;
///////////////////////////////////////////////////////////////////////////////
// Static Data
///////////////////////////////////////////////////////////////////////////////
// The single surface cache instance.
static SurfaceCacheImpl* sInstance = nullptr;
///////////////////////////////////////////////////////////////////////////////
// SurfaceCache Implementation
///////////////////////////////////////////////////////////////////////////////
class CachedSurface;
class SurfaceCacheImpl;
/*
* Cost models the cost of storing a surface in the cache. Right now, this is
* simply an estimate of the size of the surface in bytes, but in the future it
@ -224,9 +232,26 @@ public:
uint32_t aSurfaceCacheSize)
: mExpirationTracker(MOZ_THIS_IN_INITIALIZER_LIST(),
aSurfaceCacheExpirationTimeMS)
, mReporter(new SurfaceCacheReporter)
, mMemoryPressureObserver(new MemoryPressureObserver)
, mMaxCost(aSurfaceCacheSize)
, mAvailableCost(aSurfaceCacheSize)
{ }
{
NS_RegisterMemoryReporter(mReporter);
nsCOMPtr<nsIObserverService> os = mozilla::services::GetObserverService();
if (os)
os->AddObserver(mMemoryPressureObserver, "memory-pressure", false);
}
~SurfaceCacheImpl()
{
nsCOMPtr<nsIObserverService> os = mozilla::services::GetObserverService();
if (os)
os->RemoveObserver(mMemoryPressureObserver, "memory-pressure");
NS_UnregisterMemoryReporter(mReporter);
}
void Insert(DrawTarget* aTarget,
nsIntSize aTargetSize,
@ -342,6 +367,15 @@ public:
mImageCaches.Remove(aImageKey);
}
void DiscardAll()
{
// Remove in order of cost because mCosts is an array and the other data
// structures are all hash tables.
while (!mCosts.IsEmpty()) {
Remove(mCosts.LastElement().GetSurface());
}
}
static PLDHashOperator DoStopTracking(const SurfaceKey&,
CachedSurface* aSurface,
void* aCache)
@ -350,6 +384,11 @@ public:
return PL_DHASH_NEXT;
}
int64_t SizeOfSurfacesEstimate() const
{
return int64_t(mMaxCost - mAvailableCost);
}
private:
already_AddRefed<ImageSurfaceCache> GetImageCache(const ImageKey aImageKey)
{
@ -377,21 +416,51 @@ private:
SurfaceCacheImpl* const mCache; // Weak pointer to owner.
};
// XXX(seth): This is currently only an estimate and, since we don't know which
// surfaces are in GPU memory and which aren't, it's reported as KIND_OTHER and
// will also show up in heap-unclassified. Bug 923302 will make this nicer.
struct SurfaceCacheReporter : public MemoryUniReporter
{
SurfaceCacheReporter()
: MemoryUniReporter("imagelib-surface-cache",
KIND_OTHER,
UNITS_BYTES,
"Memory used by the imagelib temporary surface cache.")
{ }
protected:
int64_t Amount() MOZ_OVERRIDE
{
return sInstance ? sInstance->SizeOfSurfacesEstimate() : 0;
}
};
struct MemoryPressureObserver : public nsIObserver
{
NS_DECL_ISUPPORTS
virtual ~MemoryPressureObserver() { }
NS_IMETHOD Observe(nsISupports*, const char* aTopic, const PRUnichar*)
{
if (sInstance && strcmp(aTopic, "memory-pressure") == 0) {
sInstance->DiscardAll();
}
return NS_OK;
}
};
nsTArray<CostEntry> mCosts;
nsRefPtrHashtable<nsPtrHashKey<Image>, ImageSurfaceCache> mImageCaches;
SurfaceTracker mExpirationTracker;
nsRefPtr<SurfaceCacheReporter> mReporter;
nsRefPtr<MemoryPressureObserver> mMemoryPressureObserver;
const Cost mMaxCost;
Cost mAvailableCost;
};
///////////////////////////////////////////////////////////////////////////////
// Static Data
///////////////////////////////////////////////////////////////////////////////
// The single surface cache instance.
static SurfaceCacheImpl* sInstance = nullptr;
NS_IMPL_ISUPPORTS1(SurfaceCacheImpl::MemoryPressureObserver, nsIObserver)
///////////////////////////////////////////////////////////////////////////////
// Public API