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cpu_clear_and_set(): atomic CPU mask update in migration code

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This commit is contained in:
Balazs Gerofi
2015-08-06 10:49:55 +09:00
parent 328e69a335
commit d5c243571f
2 changed files with 20 additions and 6 deletions
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2
kernel/include/process.h
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@ -499,6 +499,8 @@ void check_need_resched(void);
void cpu_set(int cpu, cpu_set_t *cpu_set, ihk_spinlock_t *lock);
void cpu_clear(int cpu, cpu_set_t *cpu_set, ihk_spinlock_t *lock);
void cpu_clear_and_set(int c_cpu, int s_cpu,
cpu_set_t *cpu_set, ihk_spinlock_t *lock);
struct process *findthread_and_lock(int pid, int tid, ihk_spinlock_t **savelock, unsigned long *irqstate);
void process_unlock(void *savelock, unsigned long irqstate);

24
kernel/process.c
View File

@ -2044,6 +2044,17 @@ void cpu_clear(int cpu, cpu_set_t *cpu_set, ihk_spinlock_t *lock)
ihk_mc_spinlock_unlock(lock, flags);
}
void cpu_clear_and_set(int c_cpu, int s_cpu,
cpu_set_t *cpu_set, ihk_spinlock_t *lock)
{
unsigned int flags;
flags = ihk_mc_spinlock_lock(lock);
CPU_CLR(c_cpu, cpu_set);
CPU_SET(s_cpu, cpu_set);
ihk_mc_spinlock_unlock(lock, flags);
}
static void do_migrate(void);
static void idle(void)
@ -2199,11 +2210,12 @@ static void do_migrate(void)
v->runq_len += 1;
/* update cpu_set of the VM for remote TLB invalidation */
cpu_clear(old_cpu_id, &req->proc->vm->cpu_set,
&req->proc->vm->cpu_set_lock);
cpu_set(cpu_id, &req->proc->vm->cpu_set,
cpu_clear_and_set(old_cpu_id, cpu_id, &req->proc->vm->cpu_set,
&req->proc->vm->cpu_set_lock);
dkprintf("do_migrate(): migrated TID %d from CPU %d to CPU %d\n",
req->proc->ftn->tid, old_cpu_id, cpu_id);
if (v->runq_len == 1)
ihk_mc_interrupt_cpu(get_x86_cpu_local_variable(cpu_id)->apic_id, 0xd1);
double_rq_unlock(cur_v, v, irqstate);
@ -2385,11 +2397,11 @@ redo:
old_cpu_id = proc_to_move->cpu_id;
proc_to_move->cpu_id = cpu_id;
CPU_CLR(old_cpu_id, &proc_to_move->cpu_set);
CPU_SET(cpu_id, &proc_to_move->cpu_set);
settid(proc_to_move, 2, cpu_id, old_cpu_id);
__runq_add_proc(proc_to_move, cpu_id);
cpu_clear(old_cpu_id, &proc_to_move->vm->cpu_set,
&proc_to_move->vm->cpu_set_lock);
cpu_set(cpu_id, &proc_to_move->vm->cpu_set,
cpu_clear_and_set(old_cpu_id, cpu_id, &proc_to_move->vm->cpu_set,
&proc_to_move->vm->cpu_set_lock);
double_rq_unlock(cur_v, v, irqstate2);