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x86/entry: Convert reschedule interrupt to IDTENTRY_SYSVEC_SIMPLE

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The scheduler IPI does not need the full interrupt entry handling logic
when the entry is from kernel mode. Use IDTENTRY_SYSVEC_SIMPLE and spare
all the overhead.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Acked-by: Andy Lutomirski <luto@kernel.org>
Link: https://lore.kernel.org/r/20200521202119.835425642@linutronix.de
This commit is contained in:
Thomas Gleixner
2020-05-21 22:05:45 +02:00
parent cb09ea2924
commit 13cad9851e
9 changed files with 7 additions and 63 deletions
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2
arch/x86/kernel/idt.c
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@@ -112,7 +112,7 @@ static const __initconst struct idt_data def_idts[] = {
*/
static const __initconst struct idt_data apic_idts[] = {
#ifdef CONFIG_SMP
INTG(RESCHEDULE_VECTOR, reschedule_interrupt),
INTG(RESCHEDULE_VECTOR, asm_sysvec_reschedule_ipi),
INTG(CALL_FUNCTION_VECTOR, asm_sysvec_call_function),
INTG(CALL_FUNCTION_SINGLE_VECTOR, asm_sysvec_call_function_single),
INTG(IRQ_MOVE_CLEANUP_VECTOR, asm_sysvec_irq_move_cleanup),

19
arch/x86/kernel/smp.c
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@@ -220,26 +220,15 @@ static void native_stop_other_cpus(int wait)
/*
* Reschedule call back. KVM uses this interrupt to force a cpu out of
* guest mode
* guest mode.
*/
__visible void __irq_entry smp_reschedule_interrupt(struct pt_regs *regs)
DEFINE_IDTENTRY_SYSVEC_SIMPLE(sysvec_reschedule_ipi)
{
ack_APIC_irq();
trace_reschedule_entry(RESCHEDULE_VECTOR);
inc_irq_stat(irq_resched_count);
if (trace_resched_ipi_enabled()) {
/*
* scheduler_ipi() might call irq_enter() as well, but
* nested calls are fine.
*/
irq_enter();
trace_reschedule_entry(RESCHEDULE_VECTOR);
scheduler_ipi();
trace_reschedule_exit(RESCHEDULE_VECTOR);
irq_exit();
return;
}
scheduler_ipi();
trace_reschedule_exit(RESCHEDULE_VECTOR);
}
DEFINE_IDTENTRY_SYSVEC(sysvec_call_function)

17
arch/x86/kernel/tracepoint.c
View File

@@ -25,20 +25,3 @@ void trace_pagefault_unreg(void)
{
static_branch_dec(&trace_pagefault_key);
}
#ifdef CONFIG_SMP
DEFINE_STATIC_KEY_FALSE(trace_resched_ipi_key);
int trace_resched_ipi_reg(void)
{
static_branch_inc(&trace_resched_ipi_key);
return 0;
}
void trace_resched_ipi_unreg(void)
{
static_branch_dec(&trace_resched_ipi_key);
}
#endif