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Kernel: Simplify the per-CPU SchedulerData struct

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This commit is contained in:
Andreas Kling 2021-08-08 11:09:35 +02:00
parent 5712e46ddc
commit a1c82041a6
Notes: sideshowbarker 2024-07-18 07:14:20 +09:00 
Author: https://github.com/awesomekling
Commit: https://github.com/SerenityOS/serenity/commit/a1c82041a6e
2 changed files with 13 additions and 20 deletions
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1
Kernel/Forward.h
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@ -48,7 +48,6 @@ class Process;
class ProcessGroup;
class RecursiveSpinLock;
class Scheduler;
class SchedulerData;
class Socket;
class SysFS;
class SysFSDirectory;

32
Kernel/Scheduler.cpp
View file

@ -21,16 +21,10 @@
namespace Kernel {
class SchedulerData {
AK_MAKE_NONCOPYABLE(SchedulerData);
AK_MAKE_NONMOVABLE(SchedulerData);
public:
struct SchedulerData {
static ProcessorSpecificDataID processor_specific_data_id() { return ProcessorSpecificDataID::Scheduler; }
SchedulerData() = default;
bool m_in_scheduler { true };
bool in_scheduler { true };
};
RecursiveSpinLock g_scheduler_lock;
@ -210,18 +204,18 @@ bool Scheduler::pick_next()
{
VERIFY_INTERRUPTS_DISABLED();
// Set the m_in_scheduler flag before acquiring the spinlock. This
// Set the in_scheduler flag before acquiring the spinlock. This
// prevents a recursive call into Scheduler::invoke_async upon
// leaving the scheduler lock.
ScopedCritical critical;
ProcessorSpecific<SchedulerData>::get().m_in_scheduler = true;
ProcessorSpecific<SchedulerData>::get().in_scheduler = true;
ScopeGuard guard(
[]() {
// We may be on a different processor after we got switched
// back to this thread!
auto& scheduler_data = ProcessorSpecific<SchedulerData>::get();
VERIFY(scheduler_data.m_in_scheduler);
scheduler_data.m_in_scheduler = false;
VERIFY(scheduler_data.in_scheduler);
scheduler_data.in_scheduler = false;
});
ScopedSpinLock lock(g_scheduler_lock);
@ -360,8 +354,8 @@ void Scheduler::leave_on_first_switch(u32 flags)
// clean up and release locks manually here
g_scheduler_lock.unlock(flags);
auto& scheduler_data = ProcessorSpecific<SchedulerData>::get();
VERIFY(scheduler_data.m_in_scheduler);
scheduler_data.m_in_scheduler = false;
VERIFY(scheduler_data.in_scheduler);
scheduler_data.in_scheduler = false;
}
void Scheduler::prepare_after_exec()
@ -370,8 +364,8 @@ void Scheduler::prepare_after_exec()
// the new process. This is called from Processor::assume_context
VERIFY(g_scheduler_lock.own_lock());
auto& scheduler_data = ProcessorSpecific<SchedulerData>::get();
VERIFY(!scheduler_data.m_in_scheduler);
scheduler_data.m_in_scheduler = true;
VERIFY(!scheduler_data.in_scheduler);
scheduler_data.in_scheduler = true;
}
void Scheduler::prepare_for_idle_loop()
@ -381,8 +375,8 @@ void Scheduler::prepare_for_idle_loop()
VERIFY(!g_scheduler_lock.own_lock());
g_scheduler_lock.lock();
auto& scheduler_data = ProcessorSpecific<SchedulerData>::get();
VERIFY(!scheduler_data.m_in_scheduler);
scheduler_data.m_in_scheduler = true;
VERIFY(!scheduler_data.in_scheduler);
scheduler_data.in_scheduler = true;
}
Process* Scheduler::colonel()
@ -516,7 +510,7 @@ void Scheduler::invoke_async()
// Since this function is called when leaving critical sections (such
// as a SpinLock), we need to check if we're not already doing this
// to prevent recursion
if (!ProcessorSpecific<SchedulerData>::get().m_in_scheduler)
if (!ProcessorSpecific<SchedulerData>::get().in_scheduler)
pick_next();
}