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kern/util: use custom atomics wrapper to substantially improve codegen

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This commit is contained in:
Michael Scire 2021-10-19 15:24:15 -07:00
parent 52332e8d75
commit d74f364107
26 changed files with 688 additions and 260 deletions
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22
libraries/libmesosphere/source/kern_k_client_port.cpp
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@ -28,8 +28,7 @@ namespace ams::kern {
void KClientPort::OnSessionFinalized() {
KScopedSchedulerLock sl;
const auto prev = m_num_sessions--;
if (prev == m_max_sessions) {
if (m_num_sessions.FetchSub(1) == m_max_sessions) {
this->NotifyAvailable();
}
}
@ -56,7 +55,7 @@ namespace ams::kern {
bool KClientPort::IsSignaled() const {
MESOSPHERE_ASSERT_THIS();
return m_num_sessions < m_max_sessions;
return m_num_sessions.Load() < m_max_sessions;
}
Result KClientPort::CreateSession(KClientSession **out) {
@ -99,7 +98,6 @@ namespace ams::kern {
/* Check that we successfully created a session. */
R_UNLESS(session != nullptr, svc::ResultOutOfResource());
/* Update the session counts. */
auto count_guard = SCOPE_GUARD { session->Close(); };
{
@ -107,22 +105,22 @@ namespace ams::kern {
s32 new_sessions;
{
const auto max = m_max_sessions;
auto cur_sessions = m_num_sessions.load(std::memory_order_acquire);
auto cur_sessions = m_num_sessions.Load();
do {
R_UNLESS(cur_sessions < max, svc::ResultOutOfSessions());
new_sessions = cur_sessions + 1;
} while (!m_num_sessions.compare_exchange_weak(cur_sessions, new_sessions, std::memory_order_relaxed));
} while (!m_num_sessions.CompareExchangeWeak<std::memory_order_relaxed>(cur_sessions, new_sessions));
}
/* Atomically update the peak session tracking. */
{
auto peak = m_peak_sessions.load(std::memory_order_acquire);
auto peak = m_peak_sessions.Load();
do {
if (peak >= new_sessions) {
break;
}
} while (!m_peak_sessions.compare_exchange_weak(peak, new_sessions, std::memory_order_relaxed));
} while (!m_peak_sessions.CompareExchangeWeak<std::memory_order_relaxed>(peak, new_sessions));
}
}
count_guard.Cancel();
@ -183,22 +181,22 @@ namespace ams::kern {
s32 new_sessions;
{
const auto max = m_max_sessions;
auto cur_sessions = m_num_sessions.load(std::memory_order_acquire);
auto cur_sessions = m_num_sessions.Load();
do {
R_UNLESS(cur_sessions < max, svc::ResultOutOfSessions());
new_sessions = cur_sessions + 1;
} while (!m_num_sessions.compare_exchange_weak(cur_sessions, new_sessions, std::memory_order_relaxed));
} while (!m_num_sessions.CompareExchangeWeak<std::memory_order_relaxed>(cur_sessions, new_sessions));
}
/* Atomically update the peak session tracking. */
{
auto peak = m_peak_sessions.load(std::memory_order_acquire);
auto peak = m_peak_sessions.Load();
do {
if (peak >= new_sessions) {
break;
}
} while (!m_peak_sessions.compare_exchange_weak(peak, new_sessions, std::memory_order_relaxed));
} while (!m_peak_sessions.CompareExchangeWeak<std::memory_order_relaxed>(peak, new_sessions));
}
}
count_guard.Cancel();