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Kernel: Add CLOCK_MONOTONIC_COARSE to the kernel time page

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This allows clock_gettime(CLOCK_MONOTONIC_COARSE) without syscalls.
Core::EventLoop takes advantage of this automatically. :^)
This commit is contained in:
Andreas Kling 2021-08-10 21:31:31 +02:00
parent aaead6f332
commit b7dae4f90e
2 changed files with 6 additions and 4 deletions
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2
Kernel/API/TimePage.h
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@ -18,7 +18,7 @@ namespace Kernel {
inline bool time_page_supports(clockid_t clock_id) inline bool time_page_supports(clockid_t clock_id)
{ {
return clock_id == CLOCK_REALTIME_COARSE; return clock_id == CLOCK_REALTIME_COARSE || clock_id == CLOCK_MONOTONIC_COARSE;
} }
struct TimePage { struct TimePage {

8
Kernel/Time/TimeManagement.cpp
View file

@ -363,9 +363,9 @@ void TimeManagement::increment_time_since_boot_hpet()
// TODO: Apply m_remaining_epoch_time_adjustment // TODO: Apply m_remaining_epoch_time_adjustment
timespec_add(m_epoch_time, { (time_t)(delta_ns / 1000000000), (long)(delta_ns % 1000000000) }, m_epoch_time); timespec_add(m_epoch_time, { (time_t)(delta_ns / 1000000000), (long)(delta_ns % 1000000000) }, m_epoch_time);
update_time_page();
m_update1.store(update_iteration + 1, AK::MemoryOrder::memory_order_release); m_update1.store(update_iteration + 1, AK::MemoryOrder::memory_order_release);
update_time_page();
} }
void TimeManagement::increment_time_since_boot() void TimeManagement::increment_time_since_boot()
@ -396,8 +396,9 @@ void TimeManagement::increment_time_since_boot()
m_ticks_this_second = 0; m_ticks_this_second = 0;
} }
update_time_page();
m_update1.store(update_iteration + 1, AK::MemoryOrder::memory_order_release); m_update1.store(update_iteration + 1, AK::MemoryOrder::memory_order_release);
update_time_page();
} }
void TimeManagement::system_timer_tick(const RegisterState& regs) void TimeManagement::system_timer_tick(const RegisterState& regs)
@ -432,6 +433,7 @@ void TimeManagement::update_time_page()
auto* page = time_page(); auto* page = time_page();
u32 update_iteration = AK::atomic_fetch_add(&page->update2, 1u, AK::MemoryOrder::memory_order_acquire); u32 update_iteration = AK::atomic_fetch_add(&page->update2, 1u, AK::MemoryOrder::memory_order_acquire);
page->clocks[CLOCK_REALTIME_COARSE] = m_epoch_time; page->clocks[CLOCK_REALTIME_COARSE] = m_epoch_time;
page->clocks[CLOCK_MONOTONIC_COARSE] = monotonic_time(TimePrecision::Coarse).to_timespec();
AK::atomic_store(&page->update1, update_iteration + 1u, AK::MemoryOrder::memory_order_release); AK::atomic_store(&page->update1, update_iteration + 1u, AK::MemoryOrder::memory_order_release);
} }