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| author | Yordan Karadzhov (VMware) <y.karadz@gmail.com> | 2021-04-15 21:18:50 +0300 |
|---|---|---|
| committer | Steven Rostedt (VMware) <rostedt@goodmis.org> | 2021-04-15 14:50:01 -0400 |
| commit | f689e4f280b69cd7341743c2ecacd1b13528a0d8 (patch) | |
| tree | 37f7ddc7a540119de90efc4671abc93ecabd48e2 /kernel/trace/trace.h | |
| parent | eaa7a897206ac5bfa7da3f647686209ada1984d0 (diff) | |
| download | linux-stable-f689e4f280b69cd7341743c2ecacd1b13528a0d8.tar.gz linux-stable-f689e4f280b69cd7341743c2ecacd1b13528a0d8.tar.bz2 linux-stable-f689e4f280b69cd7341743c2ecacd1b13528a0d8.zip | |
tracing: Define new ftrace event "func_repeats"
The event aims to consolidate the function tracing record in the cases
when a single function is called number of times consecutively.
while (cond)
do_func();
This may happen in various scenarios (busy waiting for example).
The new ftrace event can be used to show repeated function events with
a single event and save space on the ring buffer
Link: https://lkml.kernel.org/r/20210415181854.147448-3-y.karadz@gmail.com
Signed-off-by: Yordan Karadzhov (VMware) <y.karadz@gmail.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Diffstat (limited to 'kernel/trace/trace.h')
| -rw-r--r-- | kernel/trace/trace.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/kernel/trace/trace.h b/kernel/trace/trace.h index 5506424eae2a..6a5b4c2a0fa7 100644 --- a/kernel/trace/trace.h +++ b/kernel/trace/trace.h @@ -45,6 +45,7 @@ enum trace_type { TRACE_BPUTS, TRACE_HWLAT, TRACE_RAW_DATA, + TRACE_FUNC_REPEATS, __TRACE_LAST_TYPE, }; @@ -442,6 +443,8 @@ extern void __ftrace_bad_type(void); TRACE_GRAPH_ENT); \ IF_ASSIGN(var, ent, struct ftrace_graph_ret_entry, \ TRACE_GRAPH_RET); \ + IF_ASSIGN(var, ent, struct func_repeats_entry, \ + TRACE_FUNC_REPEATS); \ __ftrace_bad_type(); \ } while (0) |