static void maybe_change_configuration()

in kernel/perf_event.c [391:425]

• 27 lines of code
• 8 McCabe index (conditional complexity)

static void maybe_change_configuration(struct cpu_hw_events *cpuc)
{
	int j;

	if (cpuc->n_added == 0)
		return;

	/* Find counters that are moving to another PMC and update */
	for (j = 0; j < cpuc->n_events; j++) {
		struct perf_event *pe = cpuc->event[j];

		if (cpuc->current_idx[j] != PMC_NO_INDEX &&
			cpuc->current_idx[j] != pe->hw.idx) {
			alpha_perf_event_update(pe, &pe->hw, cpuc->current_idx[j], 0);
			cpuc->current_idx[j] = PMC_NO_INDEX;
		}
	}

	/* Assign to counters all unassigned events. */
	cpuc->idx_mask = 0;
	for (j = 0; j < cpuc->n_events; j++) {
		struct perf_event *pe = cpuc->event[j];
		struct hw_perf_event *hwc = &pe->hw;
		int idx = hwc->idx;

		if (cpuc->current_idx[j] == PMC_NO_INDEX) {
			alpha_perf_event_set_period(pe, hwc, idx);
			cpuc->current_idx[j] = idx;
		}

		if (!(hwc->state & PERF_HES_STOPPED))
			cpuc->idx_mask |= (1<<cpuc->current_idx[j]);
	}
	cpuc->config = cpuc->event[0]->hw.config_base;
}