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authorSteven Rostedt (VMware) <rostedt@goodmis.org>2018-03-23 10:18:03 -0400
committerSteven Rostedt (VMware) <rostedt@goodmis.org>2018-04-06 08:56:54 -0400
commit4ee7c60de83ac01fa4c33c55937357601631e8ad (patch)
tree782bae7199ba64345a70e7094f270dea434331ee /include
parent8ec8405f081e1e0f800b20f683451c37e81e26c1 (diff)
downloadlinux-4ee7c60de83ac01fa4c33c55937357601631e8ad.tar.bz2
init, tracing: Add initcall trace events
Being able to trace the start and stop of initcalls is useful to see where the timings are an issue. There is already an "initcall_debug" parameter, but that can cause a large overhead itself, as the printing of the information may take longer than the initcall functions. Adding in a start and finish trace event around the initcall functions, as well as a trace event that records the level of the initcalls, one can get a much finer measurement of the times and interactions of the initcalls themselves, as trace events are much lighter than printk()s. Suggested-by: Abderrahmane Benbachir <abderrahmane.benbachir@polymtl.ca> Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Diffstat (limited to 'include')
-rw-r--r--include/trace/events/initcall.h66
1 files changed, 66 insertions, 0 deletions
diff --git a/include/trace/events/initcall.h b/include/trace/events/initcall.h
new file mode 100644
index 000000000000..8d6cf10d27c9
--- /dev/null
+++ b/include/trace/events/initcall.h
@@ -0,0 +1,66 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#undef TRACE_SYSTEM
+#define TRACE_SYSTEM initcall
+
+#if !defined(_TRACE_INITCALL_H) || defined(TRACE_HEADER_MULTI_READ)
+#define _TRACE_INITCALL_H
+
+#include <linux/tracepoint.h>
+
+TRACE_EVENT(initcall_level,
+
+ TP_PROTO(const char *level),
+
+ TP_ARGS(level),
+
+ TP_STRUCT__entry(
+ __string(level, level)
+ ),
+
+ TP_fast_assign(
+ __assign_str(level, level);
+ ),
+
+ TP_printk("level=%s", __get_str(level))
+);
+
+TRACE_EVENT(initcall_start,
+
+ TP_PROTO(initcall_t func),
+
+ TP_ARGS(func),
+
+ TP_STRUCT__entry(
+ __field(initcall_t, func)
+ ),
+
+ TP_fast_assign(
+ __entry->func = func;
+ ),
+
+ TP_printk("func=%pS", __entry->func)
+);
+
+TRACE_EVENT(initcall_finish,
+
+ TP_PROTO(initcall_t func, int ret),
+
+ TP_ARGS(func, ret),
+
+ TP_STRUCT__entry(
+ __field(initcall_t, func)
+ __field(int, ret)
+ ),
+
+ TP_fast_assign(
+ __entry->func = func;
+ __entry->ret = ret;
+ ),
+
+ TP_printk("func=%pS ret=%d", __entry->func, __entry->ret)
+);
+
+#endif /* if !defined(_TRACE_GPIO_H) || defined(TRACE_HEADER_MULTI_READ) */
+
+/* This part must be outside protection */
+#include <trace/define_trace.h>