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| author | Steven Rostedt <srostedt@redhat.com> | 2009-02-15 01:17:02 +0100 |
|---|---|---|
| committer | Steven Rostedt <srostedt@redhat.com> | 2009-02-17 04:50:01 +0100 |
| commit | 988ae9d6b2bc3ebdc1a488490250a6812f85e9d4 (patch) | |
| tree | 2674e810891133bc7ddb935baa6c15a0412e2a8f | |
| parent | ftrace: trace different functions with a different tracer (diff) | |
| download | linux-988ae9d6b2bc3ebdc1a488490250a6812f85e9d4.tar.xz linux-988ae9d6b2bc3ebdc1a488490250a6812f85e9d4.zip | |
ring-buffer: add tracing_is_on to test if ring buffer is enabled
This patch adds the tracing_is_on() interface to tell if the ring
buffer is turned on or not.
Signed-off-by: Steven Rostedt <srostedt@redhat.com>
| -rw-r--r-- | include/linux/ring_buffer.h | 2 | ||||
| -rw-r--r-- | kernel/trace/ring_buffer.c | 9 |
2 files changed, 11 insertions, 0 deletions
diff --git a/include/linux/ring_buffer.h b/include/linux/ring_buffer.h index 8e6646a54acf..f5e793d69bd3 100644 --- a/include/linux/ring_buffer.h +++ b/include/linux/ring_buffer.h @@ -128,10 +128,12 @@ void ring_buffer_normalize_time_stamp(int cpu, u64 *ts); void tracing_on(void); void tracing_off(void); void tracing_off_permanent(void); +int tracing_is_on(void); #else static inline void tracing_on(void) { } static inline void tracing_off(void) { } static inline void tracing_off_permanent(void) { } +static inline int tracing_is_on(void) { return 0; } #endif void *ring_buffer_alloc_read_page(struct ring_buffer *buffer); diff --git a/kernel/trace/ring_buffer.c b/kernel/trace/ring_buffer.c index 2b4626ce95d6..8f19f1aa42b0 100644 --- a/kernel/trace/ring_buffer.c +++ b/kernel/trace/ring_buffer.c @@ -98,6 +98,15 @@ void tracing_off_permanent(void) set_bit(RB_BUFFERS_DISABLED_BIT, &ring_buffer_flags); } +/** + * tracing_is_on - show state of ring buffers enabled + */ +int tracing_is_on(void) +{ + return ring_buffer_flags == RB_BUFFERS_ON; +} +EXPORT_SYMBOL_GPL(tracing_is_on); + #include "trace.h" /* Up this if you want to test the TIME_EXTENTS and normalization */ |