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Kernel/SMP: Don't process SMP messages in non-SMP mode

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Processing SMP messages outside of non-SMP mode is a waste of time,
and now that we don't rely on the side effects of calling the message
processing function, let's stop calling it entirely. :^)
This commit is contained in:
Andreas Kling 2021-08-09 13:39:08 +02:00
parent a971de89d3
commit 74e6a70958
Notes: sideshowbarker 2024-07-18 07:11:17 +09:00 
Author: https://github.com/awesomekling
Commit: https://github.com/SerenityOS/serenity/commit/74e6a709583
2 changed files with 11 additions and 1 deletions
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5
Kernel/Arch/x86/Processor.h
View file

@ -205,7 +205,8 @@ public:
ALWAYS_INLINE static void wait_check()
{
Processor::pause();
Processor::current().smp_process_pending_messages();
if (Processor::is_smp_enabled())
Processor::current().smp_process_pending_messages();
}
[[noreturn]] static void halt();
@ -252,6 +253,8 @@ public:
ALWAYS_INLINE ProcessorInfo& info() { return *m_info; }
static bool is_smp_enabled();
ALWAYS_INLINE static Processor& current()
{
return *(Processor*)read_gs_ptr(__builtin_offsetof(Processor, m_self));

7
Kernel/Arch/x86/common/Processor.cpp
View file

@ -42,6 +42,11 @@ extern "C" void context_first_init(Thread* from_thread, Thread* to_thread, TrapF
extern "C" void enter_thread_context(Thread* from_thread, Thread* to_thread) __attribute__((used));
extern "C" FlatPtr do_init_context(Thread* thread, u32 flags) __attribute__((used));
bool Processor::is_smp_enabled()
{
return s_smp_enabled;
}
UNMAP_AFTER_INIT static void sse_init()
{
write_cr0((read_cr0() & 0xfffffffbu) | 0x2);
@ -807,6 +812,8 @@ void Processor::smp_cleanup_message(ProcessorMessage& msg)
bool Processor::smp_process_pending_messages()
{
VERIFY(s_smp_enabled);
bool did_process = false;
u32 prev_flags;
enter_critical(prev_flags);