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support for dynamically toggling time sharing when CPU is oversubscribed

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This commit is contained in:
Balazs Gerofi
2015-08-07 08:51:50 +09:00
parent aa191b87d3
commit 0a0e2c04a0
3 changed files with 46 additions and 0 deletions
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26
arch/x86/kernel/cpu.c
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@@ -39,6 +39,7 @@
#define LAPIC_ICR0 0x300
#define LAPIC_ICR2 0x310
#define LAPIC_ESR 0x280
#define LOCAL_TIMER_VECTOR 0xef
#define APIC_INT_LEVELTRIG 0x08000
#define APIC_INT_ASSERT 0x04000
@@ -48,6 +49,8 @@
#define APIC_DM_NMI 0x00400
#define APIC_DM_INIT 0x00500
#define APIC_DM_STARTUP 0x00600
#define APIC_DIVISOR 16
#define APIC_LVT_TIMER_PERIODIC (1 << 17)
//#define DEBUG_PRINT_CPU
@@ -252,6 +255,23 @@ void lapic_icr_write(unsigned int h, unsigned int l)
}
void lapic_timer_enable(unsigned int clocks)
{
unsigned int lvtt_value;
lapic_write(LAPIC_TIMER_INITIAL, clocks / APIC_DIVISOR);
lapic_write(LAPIC_TIMER_DIVIDE, 3);
/* initialize periodic timer */
lvtt_value = LOCAL_TIMER_VECTOR | APIC_LVT_TIMER_PERIODIC;
lapic_write(LAPIC_TIMER, lvtt_value);
}
void lapic_timer_disable()
{
lapic_write(LAPIC_TIMER_INITIAL, 0);
}
void print_msr(int idx)
{
int bit;
@@ -673,6 +693,12 @@ void handle_interrupt(int vector, struct x86_user_context *regs)
panic("Unhandled exception");
}
}
else if (vector == LOCAL_TIMER_VECTOR) {
/* Timer interrupt, enabled only on oversubscribed CPU cores,
* request reschedule */
v->flags |= CPU_FLAG_NEED_RESCHED;
dkprintf("timer[%lu]: CPU_FLAG_NEED_RESCHED \n", rdtsc());
}
else if (vector >= IHK_TLB_FLUSH_IRQ_VECTOR_START &&
vector < IHK_TLB_FLUSH_IRQ_VECTOR_END) {