Commit-ID: 1b6599a9d8e6c9f7e9b0476012383b1777f7fc93
Gitweb: https://git.kernel.org/tip/1b6599a9d8e6c9f7e9b0476012383b1777f7fc93
Author: Adrian Hunter <adrian.hun...@intel.com>
AuthorDate: Fri, 10 May 2019 15:41:43 +0300
Committer: Arnaldo Carvalho de Melo <a...@redhat.com>
CommitDate: Thu, 16 May 2019 14:17:24 -0300
perf intel-pt: Fix sample timestamp wrt non-taken branches
The sample timestamp is updated to ensure that the timestamp represents
the time of the sample and not a branch that the decoder is still
walking towards. The sample timestamp is updated when the decoder
returns, but the decoder does not return for non-taken branches. Update
the sample timestamp then also.
Note that commit 3f04d98e972b5 ("perf intel-pt: Improve sample
timestamp") was also a stable fix and appears, for example, in v4.4
stable tree as commit a4ebb58fd124 ("perf intel-pt: Improve sample
timestamp").
Signed-off-by: Adrian Hunter <adrian.hun...@intel.com>
Cc: Jiri Olsa <jo...@redhat.com>
Cc: sta...@vger.kernel.org # v4.4+
Fixes: 3f04d98e972b ("perf intel-pt: Improve sample timestamp")
Link: http://lkml.kernel.org/r/20190510124143.27054-4-adrian.hun...@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <a...@redhat.com>
---
tools/perf/util/intel-pt-decoder/intel-pt-decoder.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/tools/perf/util/intel-pt-decoder/intel-pt-decoder.c
b/tools/perf/util/intel-pt-decoder/intel-pt-decoder.c
index 9cbd587489bf..f4c3c84b090f 100644
--- a/tools/perf/util/intel-pt-decoder/intel-pt-decoder.c
+++ b/tools/perf/util/intel-pt-decoder/intel-pt-decoder.c
@@ -1318,8 +1318,11 @@ static int intel_pt_walk_tnt(struct intel_pt_decoder
*decoder)
return 0;
}
decoder->ip += intel_pt_insn.length;
- if (!decoder->tnt.count)
+ if (!decoder->tnt.count) {
+ decoder->sample_timestamp = decoder->timestamp;
+ decoder->sample_insn_cnt =
decoder->timestamp_insn_cnt;
return -EAGAIN;
+ }
decoder->tnt.payload <<= 1;
continue;
}
