diff options
author | Adrian Hunter <adrian.hunter@intel.com> | 2018-09-20 16:00:46 +0300 |
---|---|---|
committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2018-09-20 15:19:50 -0300 |
commit | 2dcde4e152a3e319cc7e76c7c6b8548a3c72310d (patch) | |
tree | 6ebe31b385864270f308e44b40e063c27fabe34d /tools | |
parent | 4d60e5e36aa6f11b4d9eadc5d2b94128f24870c7 (diff) | |
download | linux-2dcde4e152a3e319cc7e76c7c6b8548a3c72310d.tar.bz2 |
perf tools: Improve thread_stack__process() for trace begin / end
thread_stack__process() is used to create call paths for database
export. Improve the handling of trace begin / end to allow for a trace
that ends in a call.
Previously, the Intel PT decoder would indicate begin / end by a branch
from / to zero. That hides useful information, in particular when a
trace ends with a call. Before remedying that, enhance the thread stack
so that it identifies the trace end by the flag instead of by ip == 0.
Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Link: http://lkml.kernel.org/r/20180920130048.31432-5-adrian.hunter@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools')
-rw-r--r-- | tools/perf/util/thread-stack.c | 16 |
1 files changed, 9 insertions, 7 deletions
diff --git a/tools/perf/util/thread-stack.c b/tools/perf/util/thread-stack.c index e3f7dfecafa9..c091635bf7dc 100644 --- a/tools/perf/util/thread-stack.c +++ b/tools/perf/util/thread-stack.c @@ -357,7 +357,7 @@ void call_return_processor__free(struct call_return_processor *crp) static int thread_stack__push_cp(struct thread_stack *ts, u64 ret_addr, u64 timestamp, u64 ref, struct call_path *cp, - bool no_call) + bool no_call, bool trace_end) { struct thread_stack_entry *tse; int err; @@ -375,6 +375,7 @@ static int thread_stack__push_cp(struct thread_stack *ts, u64 ret_addr, tse->branch_count = ts->branch_count; tse->cp = cp; tse->no_call = no_call; + tse->trace_end = trace_end; return 0; } @@ -448,7 +449,7 @@ static int thread_stack__bottom(struct thread *thread, struct thread_stack *ts, return -ENOMEM; return thread_stack__push_cp(thread->ts, ip, sample->time, ref, cp, - true); + true, false); } static int thread_stack__no_call_return(struct thread *thread, @@ -480,7 +481,7 @@ static int thread_stack__no_call_return(struct thread *thread, if (!cp) return -ENOMEM; return thread_stack__push_cp(ts, 0, sample->time, ref, - cp, true); + cp, true, false); } } else if (thread_stack__in_kernel(ts) && sample->ip < ks) { /* Return to userspace, so pop all kernel addresses */ @@ -505,7 +506,7 @@ static int thread_stack__no_call_return(struct thread *thread, return -ENOMEM; err = thread_stack__push_cp(ts, sample->addr, sample->time, ref, cp, - true); + true, false); if (err) return err; @@ -525,7 +526,7 @@ static int thread_stack__trace_begin(struct thread *thread, /* Pop trace end */ tse = &ts->stack[ts->cnt - 1]; - if (tse->cp->sym == NULL && tse->cp->ip == 0) { + if (tse->trace_end) { err = thread_stack__call_return(thread, ts, --ts->cnt, timestamp, ref, false); if (err) @@ -554,7 +555,7 @@ static int thread_stack__trace_end(struct thread_stack *ts, ret_addr = sample->ip + sample->insn_len; return thread_stack__push_cp(ts, ret_addr, sample->time, ref, cp, - false); + false, true); } int thread_stack__process(struct thread *thread, struct comm *comm, @@ -604,6 +605,7 @@ int thread_stack__process(struct thread *thread, struct comm *comm, ts->last_time = sample->time; if (sample->flags & PERF_IP_FLAG_CALL) { + bool trace_end = sample->flags & PERF_IP_FLAG_TRACE_END; struct call_path_root *cpr = ts->crp->cpr; struct call_path *cp; u64 ret_addr; @@ -621,7 +623,7 @@ int thread_stack__process(struct thread *thread, struct comm *comm, if (!cp) return -ENOMEM; err = thread_stack__push_cp(ts, ret_addr, sample->time, ref, - cp, false); + cp, false, trace_end); } else if (sample->flags & PERF_IP_FLAG_RETURN) { if (!sample->ip || !sample->addr) return 0; |