trace-cmd: Make read nonblocking in find_time_stamp().

This only affects the tsc -> time of day correlation when doing
`trace-cmd record --date`.

get_date_to_ts() writes a dummy event to trace_marker and then reads it back.
Reading it back is done by looping over all per-cpu raw trace pipes and trying
to read.  This read should be non-blocking, because the dummy event can end up
on any CPU.


Signed-off-by: Aaron Fabbri <>
Signed-off-by: Steven Rostedt <>
1 file changed