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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>
This commit is contained in:
Steven Rostedt 2009-02-14 19:17:02 -05:00
parent 59df055f19
commit 988ae9d6b2
2 changed files with 11 additions and 0 deletions
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2
include/linux/ring_buffer.h
View File

@ -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);

9
kernel/trace/ring_buffer.c
View File

@ -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 */