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https://github.com/RGBCube/serenity
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Kernel: Don't use the profile timer if we don't have a timer to assign
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a5801e9919
commit
8a4cc735b9
3 changed files with 43 additions and 21 deletions
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@ -262,10 +262,16 @@ UNMAP_AFTER_INIT bool TimeManagement::probe_and_set_non_legacy_hardware_timers()
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VERIFY(periodic_timers.size() + non_periodic_timers.size() > 0);
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if (periodic_timers.size() > 0)
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m_system_timer = periodic_timers[0];
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else
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m_system_timer = non_periodic_timers[0];
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size_t taken_periodic_timers_count = 0;
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size_t taken_non_periodic_timers_count = 0;
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if (periodic_timers.size() > taken_periodic_timers_count) {
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m_system_timer = periodic_timers[taken_periodic_timers_count];
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taken_periodic_timers_count += 1;
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} else if (non_periodic_timers.size() > taken_non_periodic_timers_count) {
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m_system_timer = non_periodic_timers[taken_non_periodic_timers_count];
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taken_non_periodic_timers_count += 1;
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}
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m_system_timer->set_callback([this](const RegisterState& regs) {
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// Update the time. We don't really care too much about the
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@ -291,13 +297,18 @@ UNMAP_AFTER_INIT bool TimeManagement::probe_and_set_non_legacy_hardware_timers()
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// can query the timer.
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m_time_keeper_timer = m_system_timer;
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if (periodic_timers.size() > 1)
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m_profile_timer = periodic_timers[1];
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else
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m_profile_timer = non_periodic_timers[1];
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if (periodic_timers.size() > taken_periodic_timers_count) {
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m_profile_timer = periodic_timers[taken_periodic_timers_count];
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taken_periodic_timers_count += 1;
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} else if (non_periodic_timers.size() > taken_non_periodic_timers_count) {
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m_profile_timer = non_periodic_timers[taken_non_periodic_timers_count];
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taken_non_periodic_timers_count += 1;
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}
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m_profile_timer->set_callback(PerformanceManager::timer_tick);
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m_profile_timer->try_to_set_frequency(m_profile_timer->calculate_nearest_possible_frequency(1));
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if (m_profile_timer) {
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m_profile_timer->set_callback(PerformanceManager::timer_tick);
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m_profile_timer->try_to_set_frequency(m_profile_timer->calculate_nearest_possible_frequency(1));
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}
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return true;
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}
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@ -389,16 +400,22 @@ void TimeManagement::system_timer_tick(const RegisterState& regs)
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Scheduler::timer_tick(regs);
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}
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void TimeManagement::enable_profile_timer()
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bool TimeManagement::enable_profile_timer()
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{
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if (m_profile_enable_count.fetch_add(1) == 0)
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if (m_profile_timer && m_profile_enable_count.fetch_add(1) == 0) {
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m_profile_timer->try_to_set_frequency(m_profile_timer->calculate_nearest_possible_frequency(OPTIMAL_PROFILE_TICKS_PER_SECOND_RATE));
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return true;
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}
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return false;
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}
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void TimeManagement::disable_profile_timer()
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bool TimeManagement::disable_profile_timer()
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{
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if (m_profile_enable_count.fetch_sub(1) == 1)
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if (m_profile_timer && m_profile_enable_count.fetch_sub(1) == 1) {
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m_profile_timer->try_to_set_frequency(m_profile_timer->calculate_nearest_possible_frequency(1));
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return true;
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}
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return false;
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}
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}
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