perf tools: Dump callchain context marker names

These are hard to interpret in the raw output because they are printed
as hex but are defined in perf_event.h as decimal. Make it much easier
to read the raw callchains by just printing their names.

For example:

  $ perf report -D

  1798195372321 0x4638 [0xb0]: PERF_RECORD_SAMPLE(IP, 0x4002): 44922/44922: 0x7c8046dd3400 period: 120218 addr: 0
  ... FP chain: nr:12
  .....  0: fffffffffffffe00 (PERF_CONTEXT_USER)
  .....  1: 00007c8046dd3400
  .....  2: 00007c8046db86d3

Reviewed-by: Ian Rogers <irogers@google.com>
Signed-off-by: James Clark <james.clark@linaro.org>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Leo Yan <leo.yan@arm.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
[ Add PERF_CONTEXT_USER_DEFERRED too, as per Namhyung's review comment ]
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

diff --git a/tools/perf/util/session.c b/tools/perf/util/session.c
index 4236503c8f6c1350e98c374a3a46663ffaaf3b88..65fa9bdff1b8cdf24d35a48ef381dcfdd8edca3d 100644 (file)
--- a/tools/perf/util/session.c
+++ b/tools/perf/util/session.c
@@ -841,6 +841,28 @@ static void callchain__lbr_callstack_printf(struct perf_sample *sample)
        }
 }
 
+static const char *callchain_context_str(u64 ip)
+{
+       switch (ip) {
+       case PERF_CONTEXT_HV:
+               return " (PERF_CONTEXT_HV)";
+       case PERF_CONTEXT_KERNEL:
+               return " (PERF_CONTEXT_KERNEL)";
+       case PERF_CONTEXT_USER:
+               return " (PERF_CONTEXT_USER)";
+       case PERF_CONTEXT_GUEST:
+               return " (PERF_CONTEXT_GUEST)";
+       case PERF_CONTEXT_GUEST_KERNEL:
+               return " (PERF_CONTEXT_GUEST_KERNEL)";
+       case PERF_CONTEXT_GUEST_USER:
+               return " (PERF_CONTEXT_GUEST_USER)";
+       case PERF_CONTEXT_USER_DEFERRED:
+               return " (PERF_CONTEXT_USER_DEFERRED)";
+       default:
+               return "";
+       }
+}
+
 static void callchain__printf(struct evsel *evsel,
                              struct perf_sample *sample)
 {
@@ -853,8 +875,9 @@ static void callchain__printf(struct evsel *evsel,
        printf("... FP chain: nr:%" PRIu64 "\n", callchain->nr);
 
        for (i = 0; i < callchain->nr; i++)
-               printf("..... %2d: %016" PRIx64 "\n",
-                      i, callchain->ips[i]);
+               printf("..... %2d: %016" PRIx64 "%s\n",
+                      i, callchain->ips[i],
+                      callchain_context_str(callchain->ips[i]));
 
        if (sample->deferred_callchain)
                printf("...... (deferred)\n");