tree 9f33cee626712c6158f95c5c77380f1951f58873
parent cccab4a73984a2ac34c3a2dbec71d44f53fe961d
author Aaron Fabbri <ajfabbri@gmail.com> 1383612708 -0800
committer Steven Rostedt <rostedt@goodmis.org> 1423522227 -0500

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.

Link: http://lkml.kernel.org/r/CAF+KLxuutGDHxzLLaWL-wXsDRyM=4syJcm7wDdEgNxNCpg2TWQ@mail.gmail.com

Signed-off-by: Aaron Fabbri <ajfabbri@gmail.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>