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tracing: Make __buffer_unlock_commit() always_inline

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The function __buffer_unlock_commit() is called in a few places outside of
trace.c. But for the most part, it should really be inlined, as it is in the
hot path of the trace_events. For the callers outside of trace.c, create a
new function trace_buffer_unlock_commit_nostack(), as the reason it was used
was to avoid the stack tracing that trace_buffer_unlock_commit() could do.

Link: http://lkml.kernel.org/r/20161121183700.GW26852@two.firstfloor.org

Reported-by: Andi Kleen <andi@firstfloor.org>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
This commit is contained in:
Steven Rostedt (Red Hat) 2016-11-23 20:28:38 -05:00 • committed by Steven Rostedt
parent 4239174570
commit 52ffabe384
5 changed files with 32 additions and 21 deletions
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4
kernel/trace/trace_functions_graph.c
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@ -358,7 +358,7 @@ int __trace_graph_entry(struct trace_array *tr,
entry = ring_buffer_event_data(event);
entry->graph_ent = *trace;
if (!call_filter_check_discard(call, entry, buffer, event))
__buffer_unlock_commit(buffer, event);
trace_buffer_unlock_commit_nostack(buffer, event);
return 1;
}
@ -469,7 +469,7 @@ void __trace_graph_return(struct trace_array *tr,
entry = ring_buffer_event_data(event);
entry->ret = *trace;
if (!call_filter_check_discard(call, entry, buffer, event))
__buffer_unlock_commit(buffer, event);
trace_buffer_unlock_commit_nostack(buffer, event);
}
void trace_graph_return(struct ftrace_graph_ret *trace)