summaryrefslogtreecommitdiffstats
path: root/tools/perf/arch
diff options
context:
space:
mode:
authorAnju T Sudhakar <anju@linux.vnet.ibm.com>2019-07-18 23:47:49 +0530
committerArnaldo Carvalho de Melo <acme@redhat.com>2019-09-20 10:28:26 -0300
commit2bff2b828502b5e5d5ea5a52643d3542053df03f (patch)
tree6c2bac279a94324d507d5ab67e85681164f2ab64 /tools/perf/arch
parent124eb5f82bf9395419b20205c4dcc1b8fcda7f29 (diff)
downloadlinux-2bff2b828502b5e5d5ea5a52643d3542053df03f.tar.bz2
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@linux.vnet.ibm.com> Reviewed-by: Ravi Bangoria <ravi.bangoria@linux.ibm.com> Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com> Cc: Jiri Olsa <jolsa@redhat.com> Cc: Madhavan Srinivasan <maddy@linux.vnet.ibm.com> Cc: Michael Ellerman <mpe@ellerman.id.au> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: linuxppc-dev@lists.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@redhat.com>
Diffstat (limited to 'tools/perf/arch')
-rw-r--r--tools/perf/arch/powerpc/util/kvm-stat.c16
1 files 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 ec5b771029e4..9cc1c4a9dec4 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);