// Values are only honored on the first start
void mozilla_sampler_start(int aProfileEntries, double aInterval,
const char** aFeatures, uint32_t aFeatureCount,
const char** aThreadNameFilters, uint32_t aFilterCount)
{
if (!stack_key_initialized)
profiler_init(nullptr);
/* If the sampling interval was set using env vars, use that
in preference to anything else. */
if (sUnwindInterval > 0)
aInterval = sUnwindInterval;
/* If the entry count was set using env vars, use that, too: */
if (sProfileEntries > 0)
aProfileEntries = sProfileEntries;
// Reset the current state if the profiler is running
profiler_stop();
TableTicker* t;
t = new TableTicker(aInterval ? aInterval : PROFILE_DEFAULT_INTERVAL,
aProfileEntries ? aProfileEntries : PROFILE_DEFAULT_ENTRY,
aFeatures, aFeatureCount,
aThreadNameFilters, aFilterCount);
if (t->HasUnwinderThread()) {
// Create the unwinder thread. ATM there is only one.
uwt__init();
}
tlsTicker.set(t);
t->Start();
if (t->ProfileJS() || t->InPrivacyMode()) {
mozilla::MutexAutoLock lock(*Sampler::sRegisteredThreadsMutex);
std::vector<ThreadInfo*> threads = t->GetRegisteredThreads();
for (uint32_t i = 0; i < threads.size(); i++) {
ThreadInfo* info = threads[i];
ThreadProfile* thread_profile = info->Profile();
if (!thread_profile) {
continue;
}
if (t->ProfileJS()) {
thread_profile->GetPseudoStack()->enableJSSampling();
}
if (t->InPrivacyMode()) {
thread_profile->GetPseudoStack()->mPrivacyMode = true;
}
}
}
#if defined(SPS_OS_android) && !defined(MOZ_WIDGET_GONK)
if (t->ProfileJava()) {
int javaInterval = aInterval;
// Java sampling doesn't accuratly keep up with 1ms sampling
if (javaInterval < 10) {
aInterval = 10;
}
mozilla::AndroidBridge::Bridge()->StartJavaProfiling(javaInterval, 1000);
}
#endif
if (t->AddMainThreadIO()) {
if (!sInterposeObserver) {
// Lazily create IO interposer observer
sInterposeObserver = new mozilla::ProfilerIOInterposeObserver();
}
mozilla::IOInterposer::Register(mozilla::IOInterposeObserver::OpAll,
sInterposeObserver);
}
sIsProfiling = true;
nsCOMPtr<nsIObserverService> os = mozilla::services::GetObserverService();
if (os)
os->NotifyObservers(nullptr, "profiler-started", nullptr);
}
void mozilla_sampler_init()
{
sInitCount++;
if (stack_key_initialized)
return;
LOG("BEGIN mozilla_sampler_init");
if (!tlsPseudoStack.init() || !tlsTicker.init()) {
LOG("Failed to init.");
return;
}
stack_key_initialized = true;
Sampler::Startup();
PseudoStack *stack = new PseudoStack();
tlsPseudoStack.set(stack);
Sampler::RegisterCurrentThread("Gecko", stack, true);
if (sps_version2()) {
// Read mode settings from MOZ_PROFILER_MODE and interval
// settings from MOZ_PROFILER_INTERVAL and stack-scan threshhold
// from MOZ_PROFILER_STACK_SCAN.
read_profiler_env_vars();
// Create the unwinder thread. ATM there is only one.
uwt__init();
# if defined(SPS_PLAT_amd64_linux) || defined(SPS_PLAT_arm_android) \
|| defined(SPS_PLAT_x86_linux) || defined(SPS_PLAT_x86_android) \
|| defined(SPS_PLAT_x86_windows) || defined(SPS_PLAT_amd64_windows) /* no idea if windows is correct */
// On Linuxes, register this thread (temporarily) for profiling
int aLocal;
uwt__register_thread_for_profiling( &aLocal );
# elif defined(SPS_PLAT_amd64_darwin) || defined(SPS_PLAT_x86_darwin)
// Registration is done in platform-macos.cc
# else
# error "Unknown plat"
# endif
}
// Allow the profiler to be started using signals
OS::RegisterStartHandler();
// We can't open pref so we use an environment variable
// to know if we should trigger the profiler on startup
// NOTE: Default
const char *val = PR_GetEnv("MOZ_PROFILER_STARTUP");
if (!val || !*val) {
return;
}
const char* features[] = {"js"
, "leaf"
#if defined(XP_WIN) || defined(XP_MACOSX)
, "stackwalk"
#endif
};
profiler_start(PROFILE_DEFAULT_ENTRY, PROFILE_DEFAULT_INTERVAL,
features, sizeof(features)/sizeof(const char*));
LOG("END mozilla_sampler_init");
}