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perf auxtrace: Add option to feed branches to the thread stack

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In preparation for using the thread stack to print an indent
representing the stack depth in perf script, add an option to tell
decoders to feed branches to the thread stack. Add support for that
option to Intel PT and Intel BTS.

The advantage of using the decoder to feed the thread stack is that it
happens before branch filtering and so can be used with different itrace
options (e.g. it still works when only showing calls, even though the
thread stack needs to see calls and returns). Also it does not conflict
with using the thread stack to get callchains.

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Acked-by: Andi Kleen <ak@linux.intel.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Link: http://lkml.kernel.org/r/1466689258-28493-3-git-send-email-adrian.hunter@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Adrian Hunter 2016-06-23 16:40:57 +03:00 committed by Arnaldo Carvalho de Melo
parent 055cd33d93
commit 50f736372d
3 changed files with 23 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
tools/perf/util/auxtrace.h
View File

@ -63,6 +63,7 @@ enum itrace_period_type {
* @calls: limit branch samples to calls (can be combined with @returns)
* @returns: limit branch samples to returns (can be combined with @calls)
* @callchain: add callchain to 'instructions' events
* @thread_stack: feed branches to the thread_stack
* @last_branch: add branch context to 'instruction' events
* @callchain_sz: maximum callchain size
* @last_branch_sz: branch context size
@ -82,6 +83,7 @@ struct itrace_synth_opts {
bool calls;
bool returns;
bool callchain;
bool thread_stack;
bool last_branch;
unsigned int callchain_sz;
unsigned int last_branch_sz;

22
tools/perf/util/intel-bts.c
View File

@ -422,7 +422,8 @@ static int intel_bts_get_branch_type(struct intel_bts_queue *btsq,
}
static int intel_bts_process_buffer(struct intel_bts_queue *btsq,
struct auxtrace_buffer *buffer)
struct auxtrace_buffer *buffer,
struct thread *thread)
{
struct branch *branch;
size_t sz, bsz = sizeof(struct branch);
@ -444,6 +445,12 @@ static int intel_bts_process_buffer(struct intel_bts_queue *btsq,
if (!branch->from && !branch->to)
continue;
intel_bts_get_branch_type(btsq, branch);
if (btsq->bts->synth_opts.thread_stack)
thread_stack__event(thread, btsq->sample_flags,
le64_to_cpu(branch->from),
le64_to_cpu(branch->to),
btsq->intel_pt_insn.length,
buffer->buffer_nr + 1);
if (filter && !(filter & btsq->sample_flags))
continue;
err = intel_bts_synth_branch_sample(btsq, branch);
@ -507,12 +514,13 @@ static int intel_bts_process_queue(struct intel_bts_queue *btsq, u64 *timestamp)
goto out_put;
}
if (!btsq->bts->synth_opts.callchain && thread &&
if (!btsq->bts->synth_opts.callchain &&
!btsq->bts->synth_opts.thread_stack && thread &&
(!old_buffer || btsq->bts->sampling_mode ||
(btsq->bts->snapshot_mode && !buffer->consecutive)))
thread_stack__set_trace_nr(thread, buffer->buffer_nr + 1);
err = intel_bts_process_buffer(btsq, buffer);
err = intel_bts_process_buffer(btsq, buffer, thread);
auxtrace_buffer__drop_data(buffer);
@ -905,10 +913,14 @@ int intel_bts_process_auxtrace_info(union perf_event *event,
if (dump_trace)
return 0;
if (session->itrace_synth_opts && session->itrace_synth_opts->set)
if (session->itrace_synth_opts && session->itrace_synth_opts->set) {
bts->synth_opts = *session->itrace_synth_opts;
else
} else {
itrace_synth_opts__set_default(&bts->synth_opts);
if (session->itrace_synth_opts)
bts->synth_opts.thread_stack =
session->itrace_synth_opts->thread_stack;
}
if (bts->synth_opts.calls)
bts->branches_filter |= PERF_IP_FLAG_CALL | PERF_IP_FLAG_ASYNC |

5
tools/perf/util/intel-pt.c
View File

@ -1234,7 +1234,7 @@ static int intel_pt_sample(struct intel_pt_queue *ptq)
if (!(state->type & INTEL_PT_BRANCH))
return 0;
if (pt->synth_opts.callchain)
if (pt->synth_opts.callchain || pt->synth_opts.thread_stack)
thread_stack__event(ptq->thread, ptq->flags, state->from_ip,
state->to_ip, ptq->insn_len,
state->trace_nr);
@ -2137,6 +2137,9 @@ int intel_pt_process_auxtrace_info(union perf_event *event,
pt->synth_opts.branches = false;
pt->synth_opts.callchain = true;
}
if (session->itrace_synth_opts)
pt->synth_opts.thread_stack =
session->itrace_synth_opts->thread_stack;
}
if (pt->synth_opts.log)