Commit 70df6a73 authored by Steven Rostedt (Red Hat)'s avatar Steven Rostedt (Red Hat) Committed by Arnaldo Carvalho de Melo
Browse files

tools lib traceevent: Add more debugging to see various internal ring buffer entries 



When trace-cmd report --debug is set, show the internal ring buffer
entries like time-extends and padding. This requires adding new kbuffer
API to retrieve these items.

Signed-off-by: default avatarSteven Rostedt (VMware) <rostedt@goodmis.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Tzvetomir Stoyanov <tstoyanov@vmware.com>
Link: http://lkml.kernel.org/r/20190401164343.257591565@goodmis.org


Signed-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
parent 6699ed71

tools/lib/traceevent/kbuffer-parse.c

+49 −0
Original line number Diff line number Diff line
@@ -727,3 +727,52 @@ int kbuffer_start_of_data(struct kbuffer *kbuf) 
{

	return kbuf->start;

}



/**

 * kbuffer_raw_get - get raw buffer info

 * @kbuf:	The kbuffer

 * @subbuf:	Start of mapped subbuffer

 * @info:	Info descriptor to fill in

 *

 * For debugging. This can return internals of the ring buffer.

 * Expects to have info->next set to what it will read.

 * The type, length and timestamp delta will be filled in, and

 * @info->next will be updated to the next element.

 * The @subbuf is used to know if the info is passed the end of

 * data and NULL will be returned if it is.

 */

struct kbuffer_raw_info *

kbuffer_raw_get(struct kbuffer *kbuf, void *subbuf, struct kbuffer_raw_info *info)

{

	unsigned long long flags;

	unsigned long long delta;

	unsigned int type_len;

	unsigned int size;

	int start;

	int length;

	void *ptr = info->next;



	if (!kbuf || !subbuf)

		return NULL;



	if (kbuf->flags & KBUFFER_FL_LONG_8)

		start = 16;

	else

		start = 12;



	flags = read_long(kbuf, subbuf + 8);

	size = (unsigned int)flags & COMMIT_MASK;



	if (ptr < subbuf || ptr >= subbuf + start + size)

		return NULL;



	type_len = translate_data(kbuf, ptr, &ptr, &delta, &length);



	info->next = ptr + length;



	info->type = type_len;

	info->delta = delta;

	info->length = length;



	return info;

}

tools/lib/traceevent/kbuffer.h

+13 −0
Original line number Diff line number Diff line
@@ -65,4 +65,17 @@ int kbuffer_subbuffer_size(struct kbuffer *kbuf); 
void kbuffer_set_old_format(struct kbuffer *kbuf);

int kbuffer_start_of_data(struct kbuffer *kbuf);



/* Debugging */



struct kbuffer_raw_info {

	int			type;

	int			length;

	unsigned long long	delta;

	void			*next;

};



/* Read raw data */

struct kbuffer_raw_info *kbuffer_raw_get(struct kbuffer *kbuf, void *subbuf,

					 struct kbuffer_raw_info *info);



#endif /* _K_BUFFER_H */

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