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OpenStack Study: cpu.py**** CubicPower OpenStack Study **** def get_cpuset_ids(): """Parsing vcpu_pin_set config. Returns a list of pcpu ids can be used by instances. """ if not CONF.vcpu_pin_set: return None cpuset_ids = set() cpuset_reject_ids = set() for rule in CONF.vcpu_pin_set.split(','): rule = rule.strip() # Handle multi ',' if len(rule) < 1: continue # Note the count limit in the .split() call range_parts = rule.split('-', 1) if len(range_parts) > 1: # So, this was a range; start by converting the parts to ints try: start, end = [int(p.strip()) for p in range_parts] except ValueError: raise exception.Invalid(_("Invalid range expression %r") % rule) # Make sure it's a valid range if start > end: raise exception.Invalid(_("Invalid range expression %r") % rule) # Add available pcpu ids to set cpuset_ids |= set(range(start, end + 1)) elif rule[0] == '^': # Not a range, the rule is an exclusion rule; convert to int try: cpuset_reject_ids.add(int(rule[1:].strip())) except ValueError: raise exception.Invalid(_("Invalid exclusion " "expression %r") % rule) else: # OK, a single PCPU to include; convert to int try: cpuset_ids.add(int(rule)) except ValueError: raise exception.Invalid(_("Invalid inclusion " "expression %r") % rule) # Use sets to handle the exclusion rules for us cpuset_ids -= cpuset_reject_ids if not cpuset_ids: raise exception.Invalid(_("No CPUs available after parsing %r") % CONF.vcpu_pin_set) # This will convert the set to a sorted list for us return sorted(cpuset_ids)
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