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authorSteven Rostedt <srostedt@redhat.com>2008-05-12 15:20:42 -0400
committerThomas Gleixner <tglx@linutronix.de>2008-05-23 14:32:54 -0400
commit6cd8a4bb2f97527a9ceb30bc77ea4e959c6a95e3 (patch)
tree845af8f3c7f8956b4f3591759a0d67248af243a2 /include
parent81d68a96a39844853b37f20cc8282d9b65b78ef3 (diff)
ftrace: trace preempt off critical timings
Add preempt off timings. A lot of kernel core code is taken from the RT patch latency trace that was written by Ingo Molnar. This adds "preemptoff" and "preemptirqsoff" to /debugfs/tracing/available_tracers Now instead of just tracing irqs off, preemption off can be selected to be recorded. When this is selected, it shares the same files as irqs off timings. One can either trace preemption off, irqs off, or one or the other off. By echoing "preemptoff" into /debugfs/tracing/current_tracer, recording of preempt off only is performed. "irqsoff" will only record the time irqs are disabled, but "preemptirqsoff" will take the total time irqs or preemption are disabled. Runtime switching of these options is now supported by simpling echoing in the appropriate trace name into /debugfs/tracing/current_tracer. Signed-off-by: Steven Rostedt <srostedt@redhat.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'include')
-rw-r--r--include/linux/ftrace.h8
-rw-r--r--include/linux/irqflags.h3
-rw-r--r--include/linux/preempt.h2
3 files changed, 11 insertions, 2 deletions
diff --git a/include/linux/ftrace.h b/include/linux/ftrace.h
index 0a20445dcbcc..740c97dcf9cb 100644
--- a/include/linux/ftrace.h
+++ b/include/linux/ftrace.h
@@ -58,4 +58,12 @@ extern void mcount(void);
58# define time_hardirqs_off(a0, a1) do { } while (0) 58# define time_hardirqs_off(a0, a1) do { } while (0)
59#endif 59#endif
60 60
61#ifdef CONFIG_PREEMPT_TRACER
62 extern void notrace trace_preempt_on(unsigned long a0, unsigned long a1);
63 extern void notrace trace_preempt_off(unsigned long a0, unsigned long a1);
64#else
65# define trace_preempt_on(a0, a1) do { } while (0)
66# define trace_preempt_off(a0, a1) do { } while (0)
67#endif
68
61#endif /* _LINUX_FTRACE_H */ 69#endif /* _LINUX_FTRACE_H */
diff --git a/include/linux/irqflags.h b/include/linux/irqflags.h
index 5b711d4e9fd9..2b1c2e58566e 100644
--- a/include/linux/irqflags.h
+++ b/include/linux/irqflags.h
@@ -41,7 +41,8 @@
41# define INIT_TRACE_IRQFLAGS 41# define INIT_TRACE_IRQFLAGS
42#endif 42#endif
43 43
44#ifdef CONFIG_IRQSOFF_TRACER 44#if defined(CONFIG_IRQSOFF_TRACER) || \
45 defined(CONFIG_PREEMPT_TRACER)
45 extern void stop_critical_timings(void); 46 extern void stop_critical_timings(void);
46 extern void start_critical_timings(void); 47 extern void start_critical_timings(void);
47#else 48#else
diff --git a/include/linux/preempt.h b/include/linux/preempt.h
index 36b03d50bf40..72b1a10a59b6 100644
--- a/include/linux/preempt.h
+++ b/include/linux/preempt.h
@@ -10,7 +10,7 @@
10#include <linux/linkage.h> 10#include <linux/linkage.h>
11#include <linux/list.h> 11#include <linux/list.h>
12 12
13#ifdef CONFIG_DEBUG_PREEMPT 13#if defined(CONFIG_DEBUG_PREEMPT) || defined(CONFIG_PREEMPT_TRACER)
14 extern void add_preempt_count(int val); 14 extern void add_preempt_count(int val);
15 extern void sub_preempt_count(int val); 15 extern void sub_preempt_count(int val);
16#else 16#else