blktrace: use number of configured cpus instead of online cpus

We want to run on all online processors.  However is there is a hole in the
online cpumask this won't happen.  We need the number of configured processors
instead of online.

Cc: Jens Axboe <>
Signed-off-by: Nathan Zimmer <>
Signed-off-by: Jens Axboe <>
1 file changed