linux-kernel - [tip:perf/core] perf intel-pt: Cater for CBR change in PSB+

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Date:   Wed, 3 Jul 2019 07:04:51 -0700
From:   tip-bot for Adrian Hunter <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, adrian.hunter@...el.com,
        tglx@...utronix.de, mingo@...nel.org, jolsa@...hat.com,
        hpa@...or.com, acme@...hat.com
Subject: [tip:perf/core] perf intel-pt: Cater for CBR change in PSB+

Commit-ID:  91de8684f1cff6944634bfb9098dc3a2583f798c
Gitweb:     https://git.kernel.org/tip/91de8684f1cff6944634bfb9098dc3a2583f798c
Author:     Adrian Hunter <adrian.hunter@...el.com>
AuthorDate: Sat, 22 Jun 2019 12:32:43 +0300
Committer:  Arnaldo Carvalho de Melo <acme@...hat.com>
CommitDate: Tue, 25 Jun 2019 08:47:10 -0300

perf intel-pt: Cater for CBR change in PSB+

PSB+ provides status information only so the core-to-bus ratio (CBR) in
PSB+ will not have changed from its previous value. However, cater for
the possibility of a another CBR change that gets caught up in the PSB+
anyway.

Signed-off-by: Adrian Hunter <adrian.hunter@...el.com>
Cc: Jiri Olsa <jolsa@...hat.com>
Link: http://lkml.kernel.org/r/20190622093248.581-3-adrian.hunter@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 tools/perf/util/intel-pt-decoder/intel-pt-decoder.c | 7 +++++++
 1 file changed, 7 insertions(+)

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 3d2255f284f4..5eb792cc5d3a 100644
--- a/tools/perf/util/intel-pt-decoder/intel-pt-decoder.c
+++ b/tools/perf/util/intel-pt-decoder/intel-pt-decoder.c
@@ -1975,6 +1975,13 @@ next:
 				goto next;
 			if (err)
 				return err;
+			/*
+			 * PSB+ CBR will not have changed but cater for the
+			 * possibility of another CBR change that gets caught up
+			 * in the PSB+.
+			 */
+			if (decoder->cbr != decoder->cbr_seen)
+				return 0;
 			break;
 
 		case INTEL_PT_PIP: