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Commit 988ae9d6 authored by Steven Rostedt's avatar Steven Rostedt
Browse files

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: default avatarSteven Rostedt <srostedt@redhat.com>
parent 59df055f

include/linux/ring_buffer.h

+2 −0
Original line number Diff line number Diff line
@@ -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);

kernel/trace/ring_buffer.c

+9 −0
Original line number Diff line number Diff line
@@ -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 */