linux-kernel - [PATCH V3 03/17] perf record: Clear HEADER_CPU_PMU

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:   Fri, 13 Mar 2020 11:33:05 -0700
From:   kan.liang@...ux.intel.com
To:     acme@...nel.org, jolsa@...hat.com, peterz@...radead.org,
        mingo@...hat.com, linux-kernel@...r.kernel.org
Cc:     namhyung@...nel.org, adrian.hunter@...el.com,
        mathieu.poirier@...aro.org, ravi.bangoria@...ux.ibm.com,
        alexey.budankov@...ux.intel.com, vitaly.slobodskoy@...el.com,
        pavel.gerasimov@...el.com, mpe@...erman.id.au, eranian@...gle.com,
        ak@...ux.intel.com, Kan Liang <kan.liang@...ux.intel.com>
Subject: [PATCH V3 03/17] perf record: Clear HEADER_CPU_PMU_CAPS for non LBR call stack mode

From: Kan Liang <kan.liang@...ux.intel.com>

The CPU PMU capabilities information is only useful for LBR call stack.
Clear the feature for other perf record mode.

Reviewed-by: Andi Kleen <ak@...ux.intel.com>
Signed-off-by: Kan Liang <kan.liang@...ux.intel.com>
---
 tools/perf/builtin-record.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
index 4c301466101b..428f7f5b8e48 100644
--- a/tools/perf/builtin-record.c
+++ b/tools/perf/builtin-record.c
@@ -1120,6 +1120,9 @@ static void record__init_features(struct record *rec)
 	if (!record__comp_enabled(rec))
 		perf_header__clear_feat(&session->header, HEADER_COMPRESSED);
 
+	if (!callchain_param.enabled || (callchain_param.record_mode != CALLCHAIN_LBR))
+		perf_header__clear_feat(&session->header, HEADER_CPU_PMU_CAPS);
+
 	perf_header__clear_feat(&session->header, HEADER_STAT);
 }
 
-- 
2.17.1