Commit 9c665064 authored by Adrian Hunter's avatar Adrian Hunter Committed by Arnaldo Carvalho de Melo
Browse files

perf intel-pt: Tidy old_buffer handling in intel_pt_get_trace() 



intel_pt_get_trace() fixes overlaps between the current buffer and the
previous buffer ('old_buffer').

However the previous buffer might not have had usable data (no PSB) so
the comparison must be made against the previous buffer that had usable
data.

Tidy that by keeping a pointer for that purpose in struct intel_pt_queue.

Signed-off-by: default avatarAdrian Hunter <adrian.hunter@intel.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Link: http://lkml.kernel.org/r/1520431349-30689-8-git-send-email-adrian.hunter@intel.com


Signed-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
parent 1c071c80

tools/perf/util/intel-pt.c

+11 −13
Original line number Diff line number Diff line
@@ -132,6 +132,7 @@ struct intel_pt_queue { 
	struct intel_pt *pt;

	unsigned int queue_nr;

	struct auxtrace_buffer *buffer;

	struct auxtrace_buffer *old_buffer;

	void *decoder;

	const struct intel_pt_state *state;

	struct ip_callchain *chain;
@@ -226,7 +227,8 @@ static int intel_pt_do_fix_overlap(struct intel_pt *pt, struct auxtrace_buffer * 
static int intel_pt_get_trace(struct intel_pt_buffer *b, void *data)

{

	struct intel_pt_queue *ptq = data;

	struct auxtrace_buffer *buffer = ptq->buffer, *old_buffer = buffer;

	struct auxtrace_buffer *buffer = ptq->buffer;

	struct auxtrace_buffer *old_buffer = ptq->old_buffer;

	struct auxtrace_queue *queue;



	if (ptq->stop) {
@@ -235,7 +237,7 @@ static int intel_pt_get_trace(struct intel_pt_buffer *b, void *data) 
	}



	queue = &ptq->pt->queues.queue_array[ptq->queue_nr];

next:



	buffer = auxtrace_buffer__next(queue, buffer);

	if (!buffer) {

		if (old_buffer)
@@ -267,16 +269,6 @@ next: 
	}

	b->ref_timestamp = buffer->reference;



	/*

	 * If in snapshot mode and the buffer has no usable data, get next

	 * buffer and again check overlap against old_buffer.

	 */

	if (ptq->pt->snapshot_mode && !b->len)

		goto next;



	if (old_buffer)

		auxtrace_buffer__drop_data(old_buffer);



	if (!old_buffer || ptq->pt->sampling_mode || (ptq->pt->snapshot_mode &&

						      !buffer->consecutive)) {

		b->consecutive = false;
@@ -288,8 +280,14 @@ next: 
	if (ptq->step_through_buffers)

		ptq->stop = true;



	if (!b->len)

	if (b->len) {

		if (old_buffer)

			auxtrace_buffer__drop_data(old_buffer);

		ptq->old_buffer = buffer;

	} else {

		auxtrace_buffer__drop_data(buffer);

		return intel_pt_get_trace(b, data);

	}



	return 0;

}

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