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

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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>
This commit is contained in:
Anju T Sudhakar 2019-07-18 23:47:49 +05:30 committed by Arnaldo Carvalho de Melo
parent 124eb5f82b
commit 2bff2b8285
1 changed files with 12 additions and 4 deletions
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16
tools/perf/arch/powerpc/util/kvm-stat.c
View file

@ -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);