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Kernel: Don't use the profile timer if we don't have a timer to assign

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Liav A 2021-05-14 11:33:34 +03:00 committed by Andreas Kling
parent a5801e9919
commit 8a4cc735b9
Notes: sideshowbarker 2024-07-18 18:06:16 +09:00 
Author: https://github.com/supercomputer7
Commit: https://github.com/SerenityOS/serenity/commit/8a4cc735b91
Pull-request: https://github.com/SerenityOS/serenity/pull/7140
Reviewed-by: https://github.com/IdanHo ✅
3 changed files with 43 additions and 21 deletions
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15
Kernel/Syscalls/profiling.cpp
View file

@ -30,12 +30,13 @@ KResultOr<int> Process::sys$profiling_enable(pid_t pid)
g_global_perf_events = PerformanceEventBuffer::try_create_with_size(32 * MiB).leak_ptr();
ScopedSpinLock lock(g_processes_lock);
g_profiling_all_threads = true;
if (!TimeManagement::the().enable_profile_timer())
return ENOTSUP;
Process::for_each([](auto& process) {
PerformanceManager::add_process_created_event(process);
return IterationDecision::Continue;
});
TimeManagement::the().enable_profile_timer();
g_profiling_all_threads = true;
return 0;
}
@ -49,8 +50,9 @@ KResultOr<int> Process::sys$profiling_enable(pid_t pid)
return EPERM;
if (!process->create_perf_events_buffer_if_needed())
return ENOMEM;
if (!TimeManagement::the().enable_profile_timer())
return ENOTSUP;
process->set_profiling(true);
TimeManagement::the().enable_profile_timer();
return 0;
}
@ -62,8 +64,9 @@ KResultOr<int> Process::sys$profiling_disable(pid_t pid)
if (!is_superuser())
return EPERM;
ScopedCritical critical;
if (!TimeManagement::the().disable_profile_timer())
return ENOTSUP;
g_profiling_all_threads = false;
TimeManagement::the().disable_profile_timer();
return 0;
}
@ -75,7 +78,9 @@ KResultOr<int> Process::sys$profiling_disable(pid_t pid)
return EPERM;
if (!process->is_profiling())
return EINVAL;
TimeManagement::the().disable_profile_timer();
// FIXME: If we enabled the profile timer and it's not supported, how do we disable it now?
if (!TimeManagement::the().disable_profile_timer())
return ENOTSUP;
process->set_profiling(false);
return 0;
}

45
Kernel/Time/TimeManagement.cpp
View file

@ -262,10 +262,16 @@ UNMAP_AFTER_INIT bool TimeManagement::probe_and_set_non_legacy_hardware_timers()
VERIFY(periodic_timers.size() + non_periodic_timers.size() > 0);
if (periodic_timers.size() > 0)
m_system_timer = periodic_timers[0];
else
m_system_timer = non_periodic_timers[0];
size_t taken_periodic_timers_count = 0;
size_t taken_non_periodic_timers_count = 0;
if (periodic_timers.size() > taken_periodic_timers_count) {
m_system_timer = periodic_timers[taken_periodic_timers_count];
taken_periodic_timers_count += 1;
} else if (non_periodic_timers.size() > taken_non_periodic_timers_count) {
m_system_timer = non_periodic_timers[taken_non_periodic_timers_count];
taken_non_periodic_timers_count += 1;
}
m_system_timer->set_callback([this](const RegisterState& regs) {
// Update the time. We don't really care too much about the
@ -291,13 +297,18 @@ UNMAP_AFTER_INIT bool TimeManagement::probe_and_set_non_legacy_hardware_timers()
// can query the timer.
m_time_keeper_timer = m_system_timer;
if (periodic_timers.size() > 1)
m_profile_timer = periodic_timers[1];
else
m_profile_timer = non_periodic_timers[1];
if (periodic_timers.size() > taken_periodic_timers_count) {
m_profile_timer = periodic_timers[taken_periodic_timers_count];
taken_periodic_timers_count += 1;
} else if (non_periodic_timers.size() > taken_non_periodic_timers_count) {
m_profile_timer = non_periodic_timers[taken_non_periodic_timers_count];
taken_non_periodic_timers_count += 1;
}
m_profile_timer->set_callback(PerformanceManager::timer_tick);
m_profile_timer->try_to_set_frequency(m_profile_timer->calculate_nearest_possible_frequency(1));
if (m_profile_timer) {
m_profile_timer->set_callback(PerformanceManager::timer_tick);
m_profile_timer->try_to_set_frequency(m_profile_timer->calculate_nearest_possible_frequency(1));
}
return true;
}
@ -389,16 +400,22 @@ void TimeManagement::system_timer_tick(const RegisterState& regs)
Scheduler::timer_tick(regs);
}
void TimeManagement::enable_profile_timer()
bool TimeManagement::enable_profile_timer()
{
if (m_profile_enable_count.fetch_add(1) == 0)
if (m_profile_timer && m_profile_enable_count.fetch_add(1) == 0) {
m_profile_timer->try_to_set_frequency(m_profile_timer->calculate_nearest_possible_frequency(OPTIMAL_PROFILE_TICKS_PER_SECOND_RATE));
return true;
}
return false;
}
void TimeManagement::disable_profile_timer()
bool TimeManagement::disable_profile_timer()
{
if (m_profile_enable_count.fetch_sub(1) == 1)
if (m_profile_timer && m_profile_enable_count.fetch_sub(1) == 1) {
m_profile_timer->try_to_set_frequency(m_profile_timer->calculate_nearest_possible_frequency(1));
return true;
}
return false;
}
}

4
Kernel/Time/TimeManagement.h
View file

@ -56,8 +56,8 @@ public:
static bool is_hpet_periodic_mode_allowed();
void enable_profile_timer();
void disable_profile_timer();
bool enable_profile_timer();
bool disable_profile_timer();
u64 uptime_ms() const;
static Time now();