histogram
histogram(rwords / dtime, 50, 0.5);
histogram(rxfer / dtime, 50, 0.5);
histogram(wwords / dtime, 50, 0.5);
histogram(cur.wxfer[dn] / dtime, 50, 0.5);
histogram(atime / dtime, 50, 0.5);
histogram(100.0 * cur.cp_time[o] / total_time, 50, CPUSCALE);
static void histogram(double, int, double);
#define MEMMAN_MEMMANAGER_DESC(block_man, maxmemid, histogram, tolerance) \
.flex_mem_histogram = histogram, \