linux-kernel - [tip: perf/urgent] perf kvm stat: Set 'trace_cycles' as default event for 'perf kvm record' in powerpc

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 for Android: free password hash cracker in your pocket

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

Message-ID: <156899645662.24167.1538786694550700474.tip-bot2@tip-bot2>
Date:   Fri, 20 Sep 2019 16:20:56 -0000
From:   "tip-bot2 for Anju T Sudhakar" <tip-bot2@...utronix.de>
To:     linux-tip-commits@...r.kernel.org
Cc:     Anju T Sudhakar <anju@...ux.vnet.ibm.com>,
        Ravi Bangoria <ravi.bangoria@...ux.ibm.com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...hat.com>,
        Madhavan Srinivasan <maddy@...ux.vnet.ibm.com>,
        Michael Ellerman <mpe@...erman.id.au>,
        Namhyung Kim <namhyung@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        linuxppc-dev@...ts.ozlabs.org,
        Arnaldo Carvalho de Melo <acme@...hat.com>,
        Ingo Molnar <mingo@...nel.org>, Borislav Petkov <bp@...en8.de>,
        linux-kernel@...r.kernel.org
Subject: [tip: perf/urgent] perf kvm stat: Set 'trace_cycles' as default event
 for 'perf kvm record' in powerpc

The following commit has been merged into the perf/urgent branch of tip:

Commit-ID:     2bff2b828502b5e5d5ea5a52643d3542053df03f
Gitweb:        https://git.kernel.org/tip/2bff2b828502b5e5d5ea5a52643d3542053df03f
Author:        Anju T Sudhakar <anju@...ux.vnet.ibm.com>
AuthorDate:    Thu, 18 Jul 2019 23:47:49 +05:30
Committer:     Arnaldo Carvalho de Melo <acme@...hat.com>
CommitterDate: Fri, 20 Sep 2019 10:28:26 -03:00

perf kvm stat: Set 'trace_cycles' as default event for 'perf kvm record' in powerpc

Use 'trace_imc/trace_cycles' as the default event for 'perf kvm record'
in powerpc.

Signed-off-by: Anju T Sudhakar <anju@...ux.vnet.ibm.com>
Reviewed-by: Ravi Bangoria <ravi.bangoria@...ux.ibm.com>
Cc: Alexander Shishkin <alexander.shishkin@...ux.intel.com>
Cc: Jiri Olsa <jolsa@...hat.com>
Cc: Madhavan Srinivasan <maddy@...ux.vnet.ibm.com>
Cc: Michael Ellerman <mpe@...erman.id.au>
Cc: Namhyung Kim <namhyung@...nel.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: linuxppc-dev@...ts.ozlabs.org
Link: http://lore.kernel.org/lkml/20190718181749.30612-3-anju@linux.vnet.ibm.com
[ Add missing pmu.h header, needed because this patch uses pmu_have_event() ]
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 tools/perf/arch/powerpc/util/kvm-stat.c | 16 ++++++++++++----
 1 file changed, 12 insertions(+), 4 deletions(-)

diff --git a/tools/perf/arch/powerpc/util/kvm-stat.c b/tools/perf/arch/powerpc/util/kvm-stat.c
index ec5b771..9cc1c4a 100644
--- a/tools/perf/arch/powerpc/util/kvm-stat.c
+++ b/tools/perf/arch/powerpc/util/kvm-stat.c
@@ -5,6 +5,7 @@
 #include "util/debug.h"
 #include "util/evsel.h"
 #include "util/evlist.h"
+#include "util/pmu.h"
 
 #include "book3s_hv_exits.h"
 #include "book3s_hcalls.h"
@@ -177,8 +178,9 @@ int cpu_isa_init(struct perf_kvm_stat *kvm, const char *cpuid __maybe_unused)
 /*
  * Incase of powerpc architecture, pmu registers are programmable
  * by guest kernel. So monitoring guest via host may not provide
- * valid samples. It is better to fail the "perf kvm record"
- * with default "cycles" event to monitor guest in powerpc.
+ * valid samples with default 'cycles' event. It is better to use
+ * 'trace_imc/trace_cycles' event for guest profiling, since it
+ * can track the guest instruction pointer in the trace-record.
  *
  * Function to parse the arguments and return appropriate values.
  */
@@ -202,8 +204,14 @@ int kvm_add_default_arch_event(int *argc, const char **argv)
 
 	parse_options(j, tmp, event_options, NULL, PARSE_OPT_KEEP_UNKNOWN);
 	if (!event) {
-		free(tmp);
-		return -EINVAL;
+		if (pmu_have_event("trace_imc", "trace_cycles")) {
+			argv[j++] = strdup("-e");
+			argv[j++] = strdup("trace_imc/trace_cycles/");
+			*argc += 2;
+		} else {
+			free(tmp);
+			return -EINVAL;
+		}
 	}
 
 	free(tmp);