PERF_BUF_LEN     1237 drivers/ntb/test/ntb_perf.c 	buf = kmalloc(PERF_BUF_LEN, GFP_KERNEL);
PERF_BUF_LEN     1241 drivers/ntb/test/ntb_perf.c 	ret = perf_read_stats(perf, buf, PERF_BUF_LEN, &pos);