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ftrace: soft tracing stop and start

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Impact: add way to quickly start stop tracing from the kernel

This patch adds a soft stop and start to the trace. This simply
disables function tracing via the ftrace_disabled flag, and
disables the trace buffers to prevent recording. The tracing
code may still be executed, but the trace will not be recorded.

Signed-off-by: Steven Rostedt <srostedt@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Steven Rostedt
2008-11-05 16:05:44 -05:00
committed by Ingo Molnar
parent 60a7ecf426
commit 0f04870148
2 changed files with 84 additions and 2 deletions
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5
include/linux/ftrace.h
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@@ -216,6 +216,9 @@ static inline void __ftrace_enabled_restore(int enabled)
#ifdef CONFIG_TRACING
extern int ftrace_dump_on_oops;
extern void tracing_start(void);
extern void tracing_stop(void);
extern void
ftrace_special(unsigned long arg1, unsigned long arg2, unsigned long arg3);
@@ -246,6 +249,8 @@ ftrace_special(unsigned long arg1, unsigned long arg2, unsigned long arg3) { }
static inline int
ftrace_printk(const char *fmt, ...) __attribute__ ((format (printf, 1, 0)));
static inline void tracing_start(void) { }
static inline void tracing_stop(void) { }
static inline int
ftrace_printk(const char *fmt, ...)
{