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| author | Steven Rostedt (VMware) <rostedt@goodmis.org> | 2017-01-19 08:57:41 -0500 |
|---|---|---|
| committer | Steven Rostedt (VMware) <rostedt@goodmis.org> | 2017-01-19 08:57:41 -0500 |
| commit | 068f530b3f274d313395663bf8d674798d4858c6 (patch) | |
| tree | ab243386f95697f056b6473ca820c0e616a0e6f5 /kernel/trace/trace_branch.c | |
| parent | 134e6a034cb004ed5acd3048792de70ced1c6cf5 (diff) | |
| download | linux-next-068f530b3f274d313395663bf8d674798d4858c6.tar.gz | |
tracing: Add the constant count for branch tracer
The unlikely/likely branch profiler now gets called even if the if statement
is a constant (always goes in one direction without a compare). Add a value
to denote this in the likely/unlikely tracer as well.
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Diffstat (limited to 'kernel/trace/trace_branch.c')
| -rw-r--r-- | kernel/trace/trace_branch.c | 17 |
1 files changed, 9 insertions, 8 deletions
diff --git a/kernel/trace/trace_branch.c b/kernel/trace/trace_branch.c index fd483d74f8e1..4d8fdf3184dc 100644 --- a/kernel/trace/trace_branch.c +++ b/kernel/trace/trace_branch.c @@ -27,7 +27,7 @@ static DEFINE_MUTEX(branch_tracing_mutex); static struct trace_array *branch_tracer; static void -probe_likely_condition(struct ftrace_branch_data *f, int val, int expect) +probe_likely_condition(struct ftrace_likely_data *f, int val, int expect) { struct trace_event_call *call = &event_branch; struct trace_array *tr = branch_tracer; @@ -68,16 +68,17 @@ probe_likely_condition(struct ftrace_branch_data *f, int val, int expect) entry = ring_buffer_event_data(event); /* Strip off the path, only save the file */ - p = f->file + strlen(f->file); - while (p >= f->file && *p != '/') + p = f->data.file + strlen(f->data.file); + while (p >= f->data.file && *p != '/') p--; p++; - strncpy(entry->func, f->func, TRACE_FUNC_SIZE); + strncpy(entry->func, f->data.func, TRACE_FUNC_SIZE); strncpy(entry->file, p, TRACE_FILE_SIZE); entry->func[TRACE_FUNC_SIZE] = 0; entry->file[TRACE_FILE_SIZE] = 0; - entry->line = f->line; + entry->constant = f->constant; + entry->line = f->data.line; entry->correct = val == expect; if (!call_filter_check_discard(call, entry, buffer, event)) @@ -89,7 +90,7 @@ probe_likely_condition(struct ftrace_branch_data *f, int val, int expect) } static inline -void trace_likely_condition(struct ftrace_branch_data *f, int val, int expect) +void trace_likely_condition(struct ftrace_likely_data *f, int val, int expect) { if (!branch_tracing_enabled) return; @@ -195,7 +196,7 @@ core_initcall(init_branch_tracer); #else static inline -void trace_likely_condition(struct ftrace_branch_data *f, int val, int expect) +void trace_likely_condition(struct ftrace_likely_data *f, int val, int expect) { } #endif /* CONFIG_BRANCH_TRACER */ @@ -214,7 +215,7 @@ void ftrace_likely_update(struct ftrace_likely_data *f, int val, * conditions that the recursive nightmare that exists is too * much to try to get working. At least for now. */ - trace_likely_condition(&f->data, val, expect); + trace_likely_condition(f, val, expect); /* FIXME: Make this atomic! */ if (val == expect) |