The new option for function tracing aims to save space on the ring
buffer and to make it more readable in the case when a single function
is called number of times consecutively:
while (cond)
do_func();
Instead of having an identical records for each call of the function
we will record only the first call, followed by an event showing the
number of repeats.
Yordan Karadzhov (VMware) (5):
tracing: Define new ftrace event "func_repeats"
tracing: Add "last_func_repeats" to struct trace_array
tracing: Add method for recording "func_repeats" events
tracing: Unify the logic for function tracing options
tracing: Add "func_no_repeats" option for function tracing
kernel/trace/trace.c | 22 ++++
kernel/trace/trace.h | 24 ++++
kernel/trace/trace_entries.h | 16 +++
kernel/trace/trace_functions.c | 219 +++++++++++++++++++++++++++++----
kernel/trace/trace_output.c | 44 +++++++
5 files changed, 298 insertions(+), 27 deletions(-)
--
2.25.1
