lib/percpu_counter.c

   1
   2 #include <linux/percpu_counter.h>
   3 #include <linux/sched.h>
   4
   5 void percpu_counter_mod(struct percpu_counter *fbc, long amount)
   6 {
   7         int cpu = get_cpu();
   8         long count = fbc->counters[cpu].count;
   9
  10         count += amount;
  11         if (count >= FBC_BATCH || count <= -FBC_BATCH) {
  12                 spin_lock(&fbc->lock);
  13                 fbc->count += count;
  14                 spin_unlock(&fbc->lock);
  15                 count = 0;
  16         }
  17         fbc->counters[cpu].count = count;
  18         put_cpu();
  19 }