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Kernel: Don't make a separate allocation for thread FPU state

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We were allocating thread FPU state separately in order to ensure a
16-byte alignment. There should be no need to do that.

This patch makes it a regular value member of Thread instead, dodging
one heap allocation during thread creation.
This commit is contained in:
Andreas Kling 2021-08-05 22:29:38 +02:00
parent d5d8fba579
commit 584fa525eb
2 changed files with 7 additions and 12 deletions
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13
Kernel/Thread.cpp
View file

@ -39,10 +39,6 @@ UNMAP_AFTER_INIT void Thread::initialize()
KResultOr<NonnullRefPtr<Thread>> Thread::try_create(NonnullRefPtr<Process> process)
{
auto fpu_state = try_make<FPUState>();
if (!fpu_state)
return ENOMEM;
auto kernel_stack_region = MM.allocate_kernel_region(default_kernel_stack_size, {}, Region::Access::Read | Region::Access::Write, AllocationStrategy::AllocateNow);
if (!kernel_stack_region)
return ENOMEM;
@ -54,17 +50,16 @@ KResultOr<NonnullRefPtr<Thread>> Thread::try_create(NonnullRefPtr<Process> proce
auto name = KString::try_create(process->name());
auto thread = adopt_ref_if_nonnull(new (nothrow) Thread(move(process), kernel_stack_region.release_nonnull(), block_timer.release_nonnull(), fpu_state.release_nonnull(), move(name)));
auto thread = adopt_ref_if_nonnull(new (nothrow) Thread(move(process), kernel_stack_region.release_nonnull(), block_timer.release_nonnull(), move(name)));
if (!thread)
return ENOMEM;
return thread.release_nonnull();
}
Thread::Thread(NonnullRefPtr<Process> process, NonnullOwnPtr<Region> kernel_stack_region, NonnullRefPtr<Timer> block_timer, NonnullOwnPtr<FPUState> fpu_state, OwnPtr<KString> name)
Thread::Thread(NonnullRefPtr<Process> process, NonnullOwnPtr<Region> kernel_stack_region, NonnullRefPtr<Timer> block_timer, OwnPtr<KString> name)
: m_process(move(process))
, m_kernel_stack_region(move(kernel_stack_region))
, m_fpu_state(move(fpu_state))
, m_name(move(name))
, m_block_timer(block_timer)
, m_global_procfs_inode_index(ProcFSComponentRegistry::the().allocate_inode_index())
@ -1067,7 +1062,7 @@ RefPtr<Thread> Thread::clone(Process& process)
auto signal_action_data_span = m_signal_action_data.span();
signal_action_data_span.copy_to(clone->m_signal_action_data.span());
clone->m_signal_mask = m_signal_mask;
memcpy(clone->m_fpu_state, m_fpu_state, sizeof(FPUState));
clone->m_fpu_state = m_fpu_state;
clone->m_thread_specific_data = m_thread_specific_data;
return clone;
}
@ -1267,7 +1262,7 @@ RefPtr<Thread> Thread::from_tid(ThreadID tid)
void Thread::reset_fpu_state()
{
memcpy(m_fpu_state, &Processor::current().clean_fpu_state(), sizeof(FPUState));
memcpy(&m_fpu_state, &Processor::current().clean_fpu_state(), sizeof(FPUState));
}
bool Thread::should_be_stopped() const

6
Kernel/Thread.h
View file

@ -1038,7 +1038,7 @@ public:
u32 pending_signals() const;
u32 pending_signals_for_state() const;
FPUState& fpu_state() { return *m_fpu_state; }
FPUState& fpu_state() { return m_fpu_state; }
KResult make_thread_specific_region(Badge<Process>);
@ -1215,7 +1215,7 @@ public:
String backtrace();
private:
Thread(NonnullRefPtr<Process>, NonnullOwnPtr<Region>, NonnullRefPtr<Timer>, NonnullOwnPtr<FPUState>, OwnPtr<KString>);
Thread(NonnullRefPtr<Process>, NonnullOwnPtr<Region>, NonnullRefPtr<Timer>, OwnPtr<KString>);
IntrusiveListNode<Thread> m_process_thread_list_node;
int m_runnable_priority { -1 };
@ -1344,7 +1344,7 @@ private:
unsigned m_ipv4_socket_read_bytes { 0 };
unsigned m_ipv4_socket_write_bytes { 0 };
OwnPtr<FPUState> m_fpu_state;
FPUState m_fpu_state {};
State m_state { Invalid };
OwnPtr<KString> m_name;
u32 m_priority { THREAD_PRIORITY_NORMAL };