Merge "Implement CacheManager for the Skia pipelines."

11 files changed, 444 insertions, 25 deletions

diff --git a/libs/hwui/Android.bp b/libs/hwui/Android.bp
index 4cfb9d88c716..303d05f084aa 100644
--- a/libs/hwui/Android.bp
+++ b/libs/hwui/Android.bp
@@ -141,6 +141,7 @@ cc_defaults {
         "renderstate/Scissor.cpp",
         "renderstate/Stencil.cpp",
         "renderstate/TextureState.cpp",
+        "renderthread/CacheManager.cpp",
         "renderthread/CanvasContext.cpp",
         "renderthread/OpenGLPipeline.cpp",
         "renderthread/DrawFrameTask.cpp",
@@ -300,6 +301,7 @@ cc_test {
         "tests/unit/BakedOpRendererTests.cpp",
         "tests/unit/BakedOpStateTests.cpp",
         "tests/unit/BitmapTests.cpp",
+        "tests/unit/CacheManagerTests.cpp",
         "tests/unit/CanvasContextTests.cpp",
         "tests/unit/CanvasStateTests.cpp",
         "tests/unit/ClipAreaTests.cpp",
diff --git a/libs/hwui/pipeline/skia/SkiaPipeline.cpp b/libs/hwui/pipeline/skia/SkiaPipeline.cpp
index 88293db193f8..bbbbd5ce51b2 100644
--- a/libs/hwui/pipeline/skia/SkiaPipeline.cpp
+++ b/libs/hwui/pipeline/skia/SkiaPipeline.cpp
@@ -50,8 +50,7 @@ TaskManager* SkiaPipeline::getTaskManager() {
 }
 
 void SkiaPipeline::onDestroyHardwareResources() {
-    // No need to flush the caches here. There is a timer
-    // which will flush temporary resources over time.
+    mRenderThread.cacheManager().trimStaleResources();
 }
 
 bool SkiaPipeline::pinImages(std::vector<SkImage*>& mutableImages) {
diff --git a/libs/hwui/renderstate/RenderState.h b/libs/hwui/renderstate/RenderState.h
index 787946f79f6b..4b7a86580621 100644
--- a/libs/hwui/renderstate/RenderState.h
+++ b/libs/hwui/renderstate/RenderState.h
@@ -45,6 +45,7 @@ class Layer;
 class DeferredLayerUpdater;
 
 namespace renderthread {
+class CacheManager;
 class CanvasContext;
 class RenderThread;
 }
@@ -55,6 +56,7 @@ class RenderState {
     PREVENT_COPY_AND_ASSIGN(RenderState);
     friend class renderthread::RenderThread;
     friend class Caches;
+    friend class renderthread::CacheManager;
 public:
     void onGLContextCreated();
     void onGLContextDestroyed();
diff --git a/libs/hwui/renderthread/CacheManager.cpp b/libs/hwui/renderthread/CacheManager.cpp
new file mode 100644
index 000000000000..f0d6b3860938
--- /dev/null
+++ b/libs/hwui/renderthread/CacheManager.cpp
@@ -0,0 +1,187 @@
+/*
+ * Copyright (C) 2017 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "CacheManager.h"
+
+#include "Layer.h"
+#include "RenderThread.h"
+#include "renderstate/RenderState.h"
+
+#include <gui/Surface.h>
+#include <GrContextOptions.h>
+#include <math.h>
+#include <set>
+
+namespace android {
+namespace uirenderer {
+namespace renderthread {
+
+// This multiplier was selected based on historical review of cache sizes relative
+// to the screen resolution. This is meant to be a conservative default based on
+// that analysis. The 4.0f is used because the default pixel format is assumed to
+// be ARGB_8888.
+#define SURFACE_SIZE_MULTIPLIER (12.0f * 4.0f)
+#define BACKGROUND_RETENTION_PERCENTAGE (0.5f)
+
+// for super large fonts we will draw them as paths so no need to keep linearly
+// increasing the font cache size.
+#define FONT_CACHE_MIN_MB (0.5f)
+#define FONT_CACHE_MAX_MB (4.0f)
+
+CacheManager::CacheManager(const DisplayInfo& display)
+        : mMaxSurfaceArea(display.w * display.h) {
+    mVectorDrawableAtlas.reset(new VectorDrawableAtlas);
+}
+
+void CacheManager::reset(GrContext* context) {
+    if (context != mGrContext.get()) {
+        destroy();
+    }
+
+    if (context) {
+        mGrContext = sk_ref_sp(context);
+        mGrContext->getResourceCacheLimits(&mMaxResources, nullptr);
+        updateContextCacheSizes();
+    }
+}
+
+void CacheManager::destroy() {
+    // cleanup any caches here as the GrContext is about to go away...
+    mGrContext.reset(nullptr);
+    mVectorDrawableAtlas.reset(new VectorDrawableAtlas);
+}
+
+void CacheManager::updateContextCacheSizes() {
+    mMaxResourceBytes = mMaxSurfaceArea * SURFACE_SIZE_MULTIPLIER;
+    mBackgroundResourceBytes = mMaxResourceBytes * BACKGROUND_RETENTION_PERCENTAGE;
+
+    mGrContext->setResourceCacheLimits(mMaxResources, mMaxResourceBytes);
+}
+
+void CacheManager::configureContext(GrContextOptions* contextOptions) {
+    contextOptions->fAllowPathMaskCaching = true;
+
+    float screenMP = mMaxSurfaceArea / 1024.0f / 1024.0f;
+    float fontCacheMB = 0;
+    float decimalVal = std::modf(screenMP, &fontCacheMB);
+
+    // This is a basic heuristic to size the cache to a multiple of 512 KB
+    if (decimalVal > 0.8f) {
+        fontCacheMB += 1.0f;
+    } else if (decimalVal > 0.5f) {
+        fontCacheMB += 0.5f;
+    }
+
+    // set limits on min/max size of the cache
+    fontCacheMB = std::max(FONT_CACHE_MIN_MB, std::min(FONT_CACHE_MAX_MB, fontCacheMB));
+
+    // We must currently set the size of the text cache based on the size of the
+    // display even though we like to  be dynamicallysizing it to the size of the window.
+    // Skia's implementation doesn't provide a mechanism to resize the font cache due to
+    // the potential cost of recreating the glyphs.
+    contextOptions->fGlyphCacheTextureMaximumBytes = fontCacheMB * 1024 * 1024;
+}
+
+void CacheManager::trimMemory(TrimMemoryMode mode) {
+    if (!mGrContext) {
+        return;
+    }
+
+    mGrContext->flush();
+
+    switch (mode) {
+        case TrimMemoryMode::Complete:
+            mVectorDrawableAtlas.reset(new VectorDrawableAtlas);
+            mGrContext->freeGpuResources();
+            break;
+        case TrimMemoryMode::UiHidden:
+            mGrContext->purgeUnlockedResources(mMaxResourceBytes - mBackgroundResourceBytes, true);
+            break;
+    }
+}
+
+void CacheManager::trimStaleResources() {
+    if (!mGrContext) {
+        return;
+    }
+    mGrContext->flush();
+    mGrContext->purgeResourcesNotUsedInMs(std::chrono::seconds(30));
+}
+
+VectorDrawableAtlas* CacheManager::acquireVectorDrawableAtlas() {
+    LOG_ALWAYS_FATAL_IF(mVectorDrawableAtlas.get() == nullptr);
+    LOG_ALWAYS_FATAL_IF(mGrContext == nullptr);
+
+    /**
+     * TODO LIST:
+     *    1) compute the atlas based on the surfaceArea surface
+     *    2) identify a way to reuse cache entries
+     *    3) add ability to repack the cache?
+     *    4) define memory conditions where we clear the cache (e.g. surface->reset())
+     */
+
+    return mVectorDrawableAtlas.release();
+}
+void CacheManager::releaseVectorDrawableAtlas(VectorDrawableAtlas* atlas) {
+    LOG_ALWAYS_FATAL_IF(mVectorDrawableAtlas.get() != nullptr);
+    mVectorDrawableAtlas.reset(atlas);
+    mVectorDrawableAtlas->isNewAtlas = false;
+}
+
+void CacheManager::dumpMemoryUsage(String8& log, const RenderState* renderState) {
+    if (!mGrContext) {
+        log.appendFormat("No valid cache instance.\n");
+        return;
+    }
+
+    size_t bytesCached;
+    mGrContext->getResourceCacheUsage(nullptr, &bytesCached);
+
+    log.appendFormat("Caches:\n");
+    log.appendFormat("                         Current / Maximum\n");
+    log.appendFormat("  VectorDrawableAtlas  %6.2f kB / %6.2f kB (entries = %zu)\n",
+            0.0f, 0.0f, (size_t)0);
+
+    if (renderState) {
+        if (renderState->mActiveLayers.size() > 0) {
+            log.appendFormat("  Layer Info:\n");
+        }
+
+        size_t layerMemoryTotal = 0;
+        for (std::set<Layer*>::iterator it = renderState->mActiveLayers.begin();
+                it != renderState->mActiveLayers.end(); it++) {
+            const Layer* layer = *it;
+            const char* layerType = layer->getApi() == Layer::Api::OpenGL ? "GlLayer" : "VkLayer";
+            log.appendFormat("    %s size %dx%d\n", layerType,
+                    layer->getWidth(), layer->getHeight());
+            layerMemoryTotal += layer->getWidth() * layer->getHeight() * 4;
+        }
+        log.appendFormat("  Layers Total         %6.2f kB (numLayers = %zu)\n",
+                         layerMemoryTotal / 1024.0f, renderState->mActiveLayers.size());
+    }
+
+
+    log.appendFormat("Total memory usage:\n");
+    log.appendFormat("  %zu bytes, %.2f MB (%.2f MB is purgeable)\n",
+                     bytesCached, bytesCached / 1024.0f / 1024.0f,
+                     mGrContext->getResourceCachePurgeableBytes() / 1024.0f / 1024.0f);
+
+
+}
+
+} /* namespace renderthread */
+} /* namespace uirenderer */
+} /* namespace android */
diff --git a/libs/hwui/renderthread/CacheManager.h b/libs/hwui/renderthread/CacheManager.h
new file mode 100644
index 000000000000..43d58f2d58a8
--- /dev/null
+++ b/libs/hwui/renderthread/CacheManager.h
@@ -0,0 +1,92 @@
+/*
+ * Copyright (C) 2017 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef CACHEMANAGER_H
+#define CACHEMANAGER_H
+
+#include <GrContext.h>
+#include <SkSurface.h>
+#include <ui/DisplayInfo.h>
+#include <utils/String8.h>
+#include <vector>
+
+namespace android {
+
+class Surface;
+
+namespace uirenderer {
+
+class RenderState;
+
+namespace renderthread {
+
+class IRenderPipeline;
+class RenderThread;
+
+struct VectorDrawableAtlas {
+    sk_sp<SkSurface> surface;
+    bool isNewAtlas = true;
+};
+
+class CacheManager {
+public:
+    enum class TrimMemoryMode {
+        Complete,
+        UiHidden
+    };
+
+    void configureContext(GrContextOptions* context);
+    void trimMemory(TrimMemoryMode mode);
+    void trimStaleResources();
+    void dumpMemoryUsage(String8& log, const RenderState* renderState = nullptr);
+
+    VectorDrawableAtlas* acquireVectorDrawableAtlas();
+    void releaseVectorDrawableAtlas(VectorDrawableAtlas*);
+
+    size_t getCacheSize() const { return mMaxResourceBytes; }
+    size_t getBackgroundCacheSize() const { return mBackgroundResourceBytes; }
+
+private:
+    friend class RenderThread;
+
+    CacheManager(const DisplayInfo& display);
+
+
+    void reset(GrContext* grContext);
+    void destroy();
+    void updateContextCacheSizes();
+
+    const size_t mMaxSurfaceArea;
+    sk_sp<GrContext> mGrContext;
+
+    int mMaxResources = 0;
+    size_t mMaxResourceBytes = 0;
+    size_t mBackgroundResourceBytes = 0;
+
+    struct PipelineProps {
+        const void* pipelineKey = nullptr;
+        size_t surfaceArea = 0;
+    };
+
+    std::unique_ptr<VectorDrawableAtlas> mVectorDrawableAtlas;
+};
+
+} /* namespace renderthread */
+} /* namespace uirenderer */
+} /* namespace android */
+
+#endif /* CACHEMANAGER_H */
+
diff --git a/libs/hwui/renderthread/CanvasContext.cpp b/libs/hwui/renderthread/CanvasContext.cpp
index e2a4a2a8dec2..a79bf359913b 100644
--- a/libs/hwui/renderthread/CanvasContext.cpp
+++ b/libs/hwui/renderthread/CanvasContext.cpp
@@ -585,15 +585,37 @@ void CanvasContext::destroyHardwareResources() {
 }
 
 void CanvasContext::trimMemory(RenderThread& thread, int level) {
-    // No context means nothing to free
-    if (!thread.eglManager().hasEglContext()) return;
-
-    ATRACE_CALL();
-    if (level >= TRIM_MEMORY_COMPLETE) {
-        thread.renderState().flush(Caches::FlushMode::Full);
-        thread.eglManager().destroy();
-    } else if (level >= TRIM_MEMORY_UI_HIDDEN) {
-        thread.renderState().flush(Caches::FlushMode::Moderate);
+    auto renderType = Properties::getRenderPipelineType();
+    switch (renderType) {
+        case RenderPipelineType::OpenGL: {
+            // No context means nothing to free
+            if (!thread.eglManager().hasEglContext()) return;
+            ATRACE_CALL();
+            if (level >= TRIM_MEMORY_COMPLETE) {
+                thread.renderState().flush(Caches::FlushMode::Full);
+                thread.eglManager().destroy();
+            } else if (level >= TRIM_MEMORY_UI_HIDDEN) {
+                thread.renderState().flush(Caches::FlushMode::Moderate);
+            }
+            break;
+        }
+        case RenderPipelineType::SkiaGL:
+        case RenderPipelineType::SkiaVulkan: {
+            // No context means nothing to free
+            if (!thread.getGrContext()) return;
+            ATRACE_CALL();
+            if (level >= TRIM_MEMORY_COMPLETE) {
+                thread.cacheManager().trimMemory(CacheManager::TrimMemoryMode::Complete);
+                thread.eglManager().destroy();
+                thread.vulkanManager().destroy();
+            } else if (level >= TRIM_MEMORY_UI_HIDDEN) {
+                thread.cacheManager().trimMemory(CacheManager::TrimMemoryMode::UiHidden);
+            }
+            break;
+        }
+        default:
+            LOG_ALWAYS_FATAL("canvas context type %d not supported", (int32_t) renderType);
+            break;
     }
 }
 
diff --git a/libs/hwui/renderthread/EglManager.cpp b/libs/hwui/renderthread/EglManager.cpp
index 53d42a2b9c43..ecf686c5b40c 100644
--- a/libs/hwui/renderthread/EglManager.cpp
+++ b/libs/hwui/renderthread/EglManager.cpp
@@ -138,7 +138,7 @@ void EglManager::initialize() {
 
         GrContextOptions options;
         options.fGpuPathRenderers &= ~GrContextOptions::GpuPathRenderers::kDistanceField;
-        options.fAllowPathMaskCaching = true;
+        mRenderThread.cacheManager().configureContext(&options);
         mRenderThread.setGrContext(GrContext::Create(GrBackend::kOpenGL_GrBackend,
                 (GrBackendContext)glInterface.get(), options));
     }
diff --git a/libs/hwui/renderthread/RenderProxy.cpp b/libs/hwui/renderthread/RenderProxy.cpp
index 5a4695f1315e..ec56c313f62a 100644
--- a/libs/hwui/renderthread/RenderProxy.cpp
+++ b/libs/hwui/renderthread/RenderProxy.cpp
@@ -469,18 +469,7 @@ uint32_t RenderProxy::frameTimePercentile(int p) {
 }
 
 CREATE_BRIDGE2(dumpGraphicsMemory, int fd, RenderThread* thread) {
-    args->thread->jankTracker().dump(args->fd);
-
-    FILE *file = fdopen(args->fd, "a");
-    if (Caches::hasInstance()) {
-        String8 cachesLog;
-        Caches::getInstance().dumpMemoryUsage(cachesLog);
-        fprintf(file, "\nCaches:\n%s\n", cachesLog.string());
-    } else {
-        fprintf(file, "\nNo caches instance.\n");
-    }
-    fprintf(file, "\nPipeline=FrameBuilder\n");
-    fflush(file);
+    args->thread->dumpGraphicsMemory(args->fd);
     return nullptr;
 }
 
diff --git a/libs/hwui/renderthread/RenderThread.cpp b/libs/hwui/renderthread/RenderThread.cpp
index 055458397023..13af2c4d15e8 100644
--- a/libs/hwui/renderthread/RenderThread.cpp
+++ b/libs/hwui/renderthread/RenderThread.cpp
@@ -202,6 +202,45 @@ void RenderThread::initThreadLocals() {
     mRenderState = new RenderState(*this);
     mJankTracker = new JankTracker(mDisplayInfo);
     mVkManager = new VulkanManager(*this);
+    mCacheManager = new CacheManager(mDisplayInfo);
+}
+
+void RenderThread::dumpGraphicsMemory(int fd) {
+    jankTracker().dump(fd);
+
+    String8 cachesOutput;
+    String8 pipeline;
+    auto renderType = Properties::getRenderPipelineType();
+    switch (renderType) {
+        case RenderPipelineType::OpenGL: {
+            if (Caches::hasInstance()) {
+                cachesOutput.appendFormat("Caches:\n");
+                Caches::getInstance().dumpMemoryUsage(cachesOutput);
+            } else {
+                cachesOutput.appendFormat("No caches instance.");
+            }
+            pipeline.appendFormat("FrameBuilder");
+            break;
+        }
+        case RenderPipelineType::SkiaGL: {
+            mCacheManager->dumpMemoryUsage(cachesOutput, mRenderState);
+            pipeline.appendFormat("Skia (OpenGL)");
+            break;
+        }
+        case RenderPipelineType::SkiaVulkan: {
+            mCacheManager->dumpMemoryUsage(cachesOutput, mRenderState);
+            pipeline.appendFormat("Skia (Vulkan)");
+            break;
+        }
+        default:
+            LOG_ALWAYS_FATAL("canvas context type %d not supported", (int32_t) renderType);
+            break;
+    }
+
+    FILE *file = fdopen(fd, "a");
+    fprintf(file, "\n%s\n", cachesOutput.string());
+    fprintf(file, "\nPipeline=%s\n", pipeline.string());
+    fflush(file);
 }
 
 Readback& RenderThread::readback() {
@@ -228,6 +267,14 @@ Readback& RenderThread::readback() {
     return *mReadback;
 }
 
+void RenderThread::setGrContext(GrContext* context) {
+    mCacheManager->reset(context);
+    if (mGrContext.get()) {
+        mGrContext->releaseResourcesAndAbandonContext();
+    }
+    mGrContext.reset(context);
+}
+
 int RenderThread::displayEventReceiverCallback(int fd, int events, void* data) {
     if (events & (Looper::EVENT_ERROR | Looper::EVENT_HANGUP)) {
         ALOGE("Display event receiver pipe was closed or an error occurred.  "
diff --git a/libs/hwui/renderthread/RenderThread.h b/libs/hwui/renderthread/RenderThread.h
index 4b5601c5abc4..d9842572d7cd 100644
--- a/libs/hwui/renderthread/RenderThread.h
+++ b/libs/hwui/renderthread/RenderThread.h
@@ -20,6 +20,7 @@
 #include "RenderTask.h"
 
 #include "../JankTracker.h"
+#include "CacheManager.h"
 #include "TimeLord.h"
 
 #include <GrContext.h>
@@ -102,11 +103,13 @@ public:
     const DisplayInfo& mainDisplayInfo() { return mDisplayInfo; }
 
     GrContext* getGrContext() const { return mGrContext.get(); }
-    void setGrContext(GrContext* cxt) { mGrContext.reset(cxt); }
+    void setGrContext(GrContext* cxt);
 
+    CacheManager& cacheManager() { return *mCacheManager; }
     VulkanManager& vulkanManager() { return *mVkManager; }
 
     sk_sp<Bitmap> allocateHardwareBitmap(SkBitmap& skBitmap);
+    void dumpGraphicsMemory(int fd);
 
 protected:
     virtual bool threadLoop() override;
@@ -161,6 +164,7 @@ private:
     Readback* mReadback = nullptr;
 
     sk_sp<GrContext> mGrContext;
+    CacheManager* mCacheManager;
     VulkanManager* mVkManager;
 };
 
diff --git a/libs/hwui/tests/unit/CacheManagerTests.cpp b/libs/hwui/tests/unit/CacheManagerTests.cpp
new file mode 100644
index 000000000000..6115162c8f81
--- /dev/null
+++ b/libs/hwui/tests/unit/CacheManagerTests.cpp
@@ -0,0 +1,75 @@
+/*
+ * Copyright (C) 2017 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <gtest/gtest.h>
+
+#include "renderthread/CacheManager.h"
+#include "renderthread/EglManager.h"
+#include "tests/common/TestUtils.h"
+
+using namespace android;
+using namespace android::uirenderer;
+using namespace android::uirenderer::renderthread;
+
+static size_t getCacheUsage(GrContext* grContext) {
+    size_t cacheUsage;
+    grContext->getResourceCacheUsage(nullptr, &cacheUsage);
+    return cacheUsage;
+}
+
+RENDERTHREAD_SKIA_PIPELINE_TEST(CacheManager, trimMemory) {
+    DisplayInfo displayInfo = renderThread.mainDisplayInfo();
+    GrContext* grContext = renderThread.getGrContext();
+    ASSERT_TRUE(grContext != nullptr);
+
+    // create pairs of offscreen render targets and images until we exceed the backgroundCacheSizeLimit
+    std::vector<sk_sp<SkSurface>> surfaces;
+
+    while (getCacheUsage(grContext) <= renderThread.cacheManager().getBackgroundCacheSize()) {
+        SkImageInfo info = SkImageInfo::MakeA8(displayInfo.w, displayInfo.h);
+        sk_sp<SkSurface> surface = SkSurface::MakeRenderTarget(grContext, SkBudgeted::kYes, info);
+        surface->getCanvas()->drawColor(SK_AlphaTRANSPARENT);
+
+        grContext->flush();
+
+        surfaces.push_back(surface);
+    }
+
+    ASSERT_TRUE(1 < surfaces.size());
+
+    // attempt to trim all memory while we still hold strong refs
+    renderThread.cacheManager().trimMemory(CacheManager::TrimMemoryMode::Complete);
+    ASSERT_TRUE(0 == grContext->getResourceCachePurgeableBytes());
+
+    // free the surfaces
+    for (size_t i = 0; i < surfaces.size(); i++) {
+        ASSERT_TRUE(surfaces[i]->unique());
+        surfaces[i].reset();
+    }
+
+    // verify that we have enough purgeable bytes
+    const size_t purgeableBytes = grContext->getResourceCachePurgeableBytes();
+    ASSERT_TRUE(renderThread.cacheManager().getBackgroundCacheSize() < purgeableBytes);
+
+    // UI hidden and make sure only some got purged
+    renderThread.cacheManager().trimMemory(CacheManager::TrimMemoryMode::UiHidden);
+    ASSERT_TRUE(0 < grContext->getResourceCachePurgeableBytes());
+    ASSERT_TRUE(renderThread.cacheManager().getBackgroundCacheSize() > getCacheUsage(grContext));
+
+    // complete and make sure all get purged
+    renderThread.cacheManager().trimMemory(CacheManager::TrimMemoryMode::Complete);
+    ASSERT_TRUE(0 == grContext->getResourceCachePurgeableBytes());
+}