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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include <thread>
#include "gtest/gtest.h"
#include "mozilla/Atomics.h"
#include "mozilla/SpinEventLoopUntil.h"
#include "nsMemoryPressure.h"
#include "nsIObserver.h"
#include "nsIObserverService.h"
#include "nsServiceManagerUtils.h"
#include "nsThreadUtils.h"
using namespace mozilla;
namespace {
enum class MemoryPressureEventType : int {
LowMemory,
LowMemoryOngoing,
Stop,
};
class MemoryPressureObserver final : public nsIObserver {
nsCOMPtr<nsIObserverService> mObserverSvc;
Vector<MemoryPressureEventType> mEvents;
~MemoryPressureObserver() {
EXPECT_TRUE(
NS_SUCCEEDED(mObserverSvc->RemoveObserver(this, kTopicMemoryPressure)));
EXPECT_TRUE(NS_SUCCEEDED(
mObserverSvc->RemoveObserver(this, kTopicMemoryPressureStop)));
}
public:
NS_DECL_ISUPPORTS
MemoryPressureObserver()
: mObserverSvc(do_GetService(NS_OBSERVERSERVICE_CONTRACTID)) {
EXPECT_TRUE(NS_SUCCEEDED(mObserverSvc->AddObserver(
this, kTopicMemoryPressure, /* ownsWeak */ false)));
EXPECT_TRUE(NS_SUCCEEDED(mObserverSvc->AddObserver(
this, kTopicMemoryPressureStop, /* ownsWeak */ false)));
}
NS_IMETHOD Observe(nsISupports* aSubject, const char* aTopic,
const char16_t* aData) override {
Maybe<MemoryPressureEventType> event;
if (strcmp(aTopic, kTopicMemoryPressure) == 0) {
if (nsDependentString(aData) == kSubTopicLowMemoryNew) {
event = Some(MemoryPressureEventType::LowMemory);
} else if (nsDependentString(aData) == kSubTopicLowMemoryOngoing) {
event = Some(MemoryPressureEventType::LowMemoryOngoing);
} else {
fprintf(stderr, "Unexpected subtopic: %S\n",
reinterpret_cast<const wchar_t*>(aData));
EXPECT_TRUE(false);
}
} else if (strcmp(aTopic, kTopicMemoryPressureStop) == 0) {
event = Some(MemoryPressureEventType::Stop);
} else {
fprintf(stderr, "Unexpected topic: %s\n", aTopic);
EXPECT_TRUE(false);
}
if (event) {
(void)mEvents.emplaceBack(event.value());
}
return NS_OK;
}
uint32_t GetCount() const { return mEvents.length(); }
void Reset() { mEvents.clear(); }
MemoryPressureEventType Top() const { return mEvents[0]; }
bool ValidateTransitions() const {
if (mEvents.length() == 0) {
return true;
}
for (size_t i = 1; i < mEvents.length(); ++i) {
MemoryPressureEventType eventFrom = mEvents[i - 1];
MemoryPressureEventType eventTo = mEvents[i];
if ((eventFrom == MemoryPressureEventType::LowMemory &&
eventTo == MemoryPressureEventType::LowMemoryOngoing) ||
(eventFrom == MemoryPressureEventType::LowMemoryOngoing &&
eventTo == MemoryPressureEventType::LowMemoryOngoing) ||
(eventFrom == MemoryPressureEventType::Stop &&
eventTo == MemoryPressureEventType::LowMemory) ||
(eventFrom == MemoryPressureEventType::LowMemoryOngoing &&
eventTo == MemoryPressureEventType::Stop) ||
(eventFrom == MemoryPressureEventType::LowMemory &&
eventTo == MemoryPressureEventType::Stop)) {
// Only these transitions are valid.
continue;
}
fprintf(stderr, "Invalid transition: %d -> %d\n",
static_cast<int>(eventFrom), static_cast<int>(eventTo));
return false;
}
return true;
}
};
NS_IMPL_ISUPPORTS(MemoryPressureObserver, nsIObserver)
template <MemoryPressureState State>
void PressureSender(Atomic<bool>& aContinue) {
while (aContinue) {
std::this_thread::sleep_for(std::chrono::milliseconds(10));
NS_NotifyOfEventualMemoryPressure(State);
}
}
template <MemoryPressureState State>
void PressureSenderQuick(Atomic<bool>& aContinue) {
while (aContinue) {
std::this_thread::sleep_for(std::chrono::milliseconds(10));
NS_NotifyOfMemoryPressure(State);
}
}
} // anonymous namespace
TEST(MemoryPressure, Singlethread)
{
RefPtr observer(new MemoryPressureObserver);
NS_NotifyOfEventualMemoryPressure(MemoryPressureState::LowMemory);
SpinEventLoopUntil("xpcom:TEST(MemoryPressure, Singlethread) 1"_ns,
[&observer]() { return observer->GetCount() == 1; });
EXPECT_EQ(observer->Top(), MemoryPressureEventType::LowMemory);
observer->Reset();
NS_NotifyOfEventualMemoryPressure(MemoryPressureState::LowMemory);
SpinEventLoopUntil("xpcom:TEST(MemoryPressure, Singlethread) 2"_ns,
[&observer]() { return observer->GetCount() == 1; });
EXPECT_EQ(observer->Top(), MemoryPressureEventType::LowMemoryOngoing);
observer->Reset();
NS_NotifyOfEventualMemoryPressure(MemoryPressureState::LowMemory);
SpinEventLoopUntil("xpcom:TEST(MemoryPressure, Singlethread) 3"_ns,
[&observer]() { return observer->GetCount() == 1; });
EXPECT_EQ(observer->Top(), MemoryPressureEventType::LowMemoryOngoing);
observer->Reset();
NS_NotifyOfEventualMemoryPressure(MemoryPressureState::NoPressure);
SpinEventLoopUntil("xpcom:TEST(MemoryPressure, Singlethread) 4"_ns,
[&observer]() { return observer->GetCount() == 1; });
EXPECT_EQ(observer->Top(), MemoryPressureEventType::Stop);
}
TEST(MemoryPressure, Multithread)
{
// Start |kNumThreads| threads each for the following thread type:
// - LowMemory via NS_NotifyOfEventualMemoryPressure
// - LowMemory via NS_NotifyOfMemoryPressure
// - LowMemoryOngoing via NS_NotifyOfEventualMemoryPressure
// - LowMemoryOngoing via NS_NotifyOfMemoryPressure
// and keep them running until |kNumEventsToValidate| memory-pressure events
// are received.
constexpr int kNumThreads = 5;
constexpr int kNumEventsToValidate = 200;
Atomic<bool> shouldContinue(true);
Vector<std::thread> threads;
for (int i = 0; i < kNumThreads; ++i) {
(void)threads.emplaceBack(PressureSender<MemoryPressureState::LowMemory>,
std::ref(shouldContinue));
(void)threads.emplaceBack(PressureSender<MemoryPressureState::NoPressure>,
std::ref(shouldContinue));
(void)threads.emplaceBack(
PressureSenderQuick<MemoryPressureState::LowMemory>,
std::ref(shouldContinue));
(void)threads.emplaceBack(
PressureSenderQuick<MemoryPressureState::NoPressure>,
std::ref(shouldContinue));
}
RefPtr observer(new MemoryPressureObserver);
// We cannot sleep here because the main thread needs to keep running.
SpinEventLoopUntil(
"xpcom:TEST(MemoryPressure, Multithread)"_ns,
[&observer]() { return observer->GetCount() >= kNumEventsToValidate; });
shouldContinue = false;
for (auto& thread : threads) {
thread.join();
}
EXPECT_TRUE(observer->ValidateTransitions());
}
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