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kern: add kernel thread utilization debug

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This commit is contained in:
Michael Scire 2020-12-12 05:02:23 -08:00
parent 9a6cca7499
commit d090a7886d
1 changed files with 74 additions and 1 deletions
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75
libraries/libmesosphere/source/kern_k_dump_object.cpp
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@ -252,6 +252,13 @@ namespace ams::kern::KDumpObject {
}
}
ALWAYS_INLINE s64 GetTickOrdered() {
__asm__ __volatile__("" ::: "memory");
const s64 tick = KHardwareTimer::GetTick();
__asm__ __volatile__("" ::: "memory");
return tick;
}
}
void DumpThread() {
@ -648,7 +655,73 @@ namespace ams::kern::KDumpObject {
}
void DumpKernelCpuUtilization() {
/* TODO */
MESOSPHERE_RELEASE_LOG("Dump Kernel Cpu Utilization\n");
constexpr size_t MaxLogDepth = 64;
{
/* Create tracking arrays. */
KAutoObject *objects[MaxLogDepth];
u32 cpu_time[MaxLogDepth];
s64 start_tick;
size_t i, n;
KDpcManager::Sync();
{
/* Lock the thread list. */
KThread::ListAccessor accessor;
/* Begin tracking. */
start_tick = GetTickOrdered();
/* Iterate, finding kernel threads. */
const auto end = accessor.end();
i = 0;
for (auto it = accessor.begin(); it != end; ++it) {
KThread *thread = static_cast<KThread *>(std::addressof(*it));
if (KProcess *process = thread->GetOwnerProcess(); process == nullptr) {
if (AMS_LIKELY(i < MaxLogDepth)) {
if (AMS_LIKELY(thread->Open())) {
cpu_time[i] = thread->GetCpuTime();
objects[i] = thread;
++i;
}
}
}
}
/* Keep track of how many kernel threads we found. */
n = i;
}
/* Wait one second. */
const s64 timeout = KHardwareTimer::GetTick() + ams::svc::Tick(TimeSpan::FromSeconds(1));
GetCurrentThread().Sleep(timeout);
KDpcManager::Sync();
/* Update our metrics. */
for (i = 0; i < n; ++i) {
KThread *thread = static_cast<KThread *>(objects[i]);
cpu_time[i] = thread->GetCpuTime() - cpu_time[i];
}
/* End tracking. */
const s64 end_tick = GetTickOrdered();
/* Log thread utilization. */
for (i = 0; i < n; ++i) {
KThread *thread = static_cast<KThread *>(objects[i]);
const s64 t = static_cast<u64>(cpu_time[i]) * 1000 / (end_tick - start_tick);
MESOSPHERE_RELEASE_LOG("tid=%3lu (kernel) %3lu.%lu%% pri=%2d af=%lx\n", thread->GetId(), t / 10, t % 10, thread->GetPriority(), thread->GetAffinityMask().GetAffinityMask());
}
/* Close all objects. */
for (i = 0; i < n; ++i) {
objects[i]->Close();
}
}
MESOSPHERE_RELEASE_LOG("\n");
}
void DumpCpuUtilization() {