Mirrors/libhermit
1
0
Fork 0
mirror of https://github.com/hermitcore/libhermit.git synced 2025-03-09 00:00:03 +01:00
Code Issues Releases Wiki Activity

reduce the number of FPU restoring

Browse source
This commit is contained in:
Stefan Lankes 2016-02-15 08:54:49 +01:00
parent 82d7f108b5
commit c577d5bebb
1 changed files with 8 additions and 10 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

18
hermit/kernel/tasks.c
View file

@ -142,8 +142,9 @@ void fpu_handler(struct state *s)
// did another already use the the FPU? => save FPU state
if (readyqueues[core_id].fpu_owner) {
save_fpu_state(&(task_table[readyqueues[core_id].fpu_owner].fpu));
readyqueues[core_id].fpu_owner = 0;
task_table[readyqueues[core_id].fpu_owner].flags &= ~TASK_FPU_USED;
}
readyqueues[core_id].fpu_owner = task->id;
spinlock_irqsave_unlock(&readyqueues[core_id].lock);
restore_fpu_state(&task->fpu);
@ -240,6 +241,9 @@ void finish_task_switch(void)
old->last_stack_pointer = NULL;
readyqueues[core_id].old_task = NULL;
if (readyqueues[core_id].fpu_owner == old->id)
readyqueues[core_id].fpu_owner = 0;
/* signalizes that this task could be reused */
old->status = TASK_INVALID;
} else {
@ -836,19 +840,13 @@ size_t** scheduler(void)
}
get_task_out:
spinlock_irqsave_unlock(&readyqueues[core_id].lock);
if (curr_task != orig_task) {
/* if the original task is using the FPU, we need to save the FPU context */
if ((orig_task->flags & TASK_FPU_USED) && (orig_task->status == TASK_READY)) {
readyqueues[core_id].fpu_owner = orig_task->id;
orig_task->flags &= ~TASK_FPU_USED;
}
spinlock_irqsave_unlock(&readyqueues[core_id].lock);
//kprintf("schedule on core %d from %u to %u with prio %u\n", core_id, orig_task->id, curr_task->id, (uint32_t)curr_task->prio);
return (size_t**) &(orig_task->last_stack_pointer);
} else spinlock_irqsave_unlock(&readyqueues[core_id].lock);
}
return NULL;
}