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author | Yordan Karadzhov (VMware) <y.karadz@gmail.com> | 2021-04-15 21:18:52 +0300 |
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committer | Steven Rostedt (VMware) <rostedt@goodmis.org> | 2021-04-15 14:50:02 -0400 |
commit | c658797f1a70561205a224be0c8be64977ed64e8 (patch) | |
tree | 78291ae35b41cbe969cc3dd477268049f4cbe1fd /kernel/trace/trace.c | |
parent | 20344c54d1c7ab7428e312bbe9b0097750875002 (diff) | |
download | linux-c658797f1a70561205a224be0c8be64977ed64e8.tar.bz2 |
tracing: Add method for recording "func_repeats" events
This patch only provides the implementation of the method.
Later we will used it in a combination with a new option for
function tracing.
Link: https://lkml.kernel.org/r/20210415181854.147448-5-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.c')
-rw-r--r-- | kernel/trace/trace.c | 34 |
1 files changed, 34 insertions, 0 deletions
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c index 82833be07c1e..66a4ad93b5e9 100644 --- a/kernel/trace/trace.c +++ b/kernel/trace/trace.c @@ -3117,6 +3117,40 @@ static void ftrace_trace_userstack(struct trace_array *tr, #endif /* CONFIG_STACKTRACE */ +static inline void +func_repeats_set_delta_ts(struct func_repeats_entry *entry, + unsigned long long delta) +{ + entry->bottom_delta_ts = delta & U32_MAX; + entry->top_delta_ts = (delta >> 32); +} + +void trace_last_func_repeats(struct trace_array *tr, + struct trace_func_repeats *last_info, + unsigned int trace_ctx) +{ + struct trace_buffer *buffer = tr->array_buffer.buffer; + struct func_repeats_entry *entry; + struct ring_buffer_event *event; + u64 delta; + + event = __trace_buffer_lock_reserve(buffer, TRACE_FUNC_REPEATS, + sizeof(*entry), trace_ctx); + if (!event) + return; + + delta = ring_buffer_event_time_stamp(buffer, event) - + last_info->ts_last_call; + + entry = ring_buffer_event_data(event); + entry->ip = last_info->ip; + entry->parent_ip = last_info->parent_ip; + entry->count = last_info->count; + func_repeats_set_delta_ts(entry, delta); + + __buffer_unlock_commit(buffer, event); +} + /* created for use with alloc_percpu */ struct trace_buffer_struct { int nesting; |