C++ (Cpp) prop_adjust_shift Examples

Example #1

File: proportions.c Project: 0xroot/Blackphone-BP1-Kernel

/*
 * Catch up with missed period expirations.
 *
 *   until (c_{j} == c)
 *     x_{j} -= x_{j}/2;
 *     c_{j}++;
 */
static
void prop_norm_percpu(struct prop_global *pg, struct prop_local_percpu *pl)
{
	unsigned long period = 1UL << (pg->shift - 1);
	unsigned long period_mask = ~(period - 1);
	unsigned long global_period;
	unsigned long flags;

	global_period = percpu_counter_read(&pg->events);
	global_period &= period_mask;

	/*
	 * Fast path - check if the local and global period count still match
	 * outside of the lock.
	 */
	if (pl->period == global_period)
		return;

	raw_spin_lock_irqsave(&pl->lock, flags);
	prop_adjust_shift(&pl->shift, &pl->period, pg->shift);

	/*
	 * For each missed period, we half the local counter.
	 * basically:
	 *   pl->events >> (global_period - pl->period);
	 */
	period = (global_period - pl->period) >> (pg->shift - 1);
	if (period < BITS_PER_LONG) {
		s64 val = percpu_counter_read(&pl->events);

		if (val < (nr_cpu_ids * PROP_BATCH))
			val = percpu_counter_sum(&pl->events);

		__percpu_counter_add(&pl->events, -val + (val >> period),
					PROP_BATCH);
	} else

Example #2

File: proportions.c Project: romanbb/android_kernel_lge_d851

static
void prop_norm_percpu(struct prop_global *pg, struct prop_local_percpu *pl)
{
	unsigned long period = 1UL << (pg->shift - 1);
	unsigned long period_mask = ~(period - 1);
	unsigned long global_period;
	unsigned long flags;

	global_period = percpu_counter_read(&pg->events);
	global_period &= period_mask;

	/*
                                                                      
                        
  */
	if (pl->period == global_period)
		return;

	raw_spin_lock_irqsave(&pl->lock, flags);
	prop_adjust_shift(&pl->shift, &pl->period, pg->shift);

	/*
                                                      
              
                                                 
  */
	period = (global_period - pl->period) >> (pg->shift - 1);
	if (period < BITS_PER_LONG) {
		s64 val = percpu_counter_read(&pl->events);

		if (val < (nr_cpu_ids * PROP_BATCH))
			val = percpu_counter_sum(&pl->events);

		__percpu_counter_add(&pl->events, -val + (val >> period),
					PROP_BATCH);
	} else