perf tools: Handle kernels that don't support attr.exclude_{guest,host}

Just fall back to resetting those fields, if set, warning the user that
that feature is not available.

If guest samples appear they will just be discarded because no struct
machine will be found and thus the event will be accounted as not
handled and dropped, see 0c09571.

Reported-by: Namhyung Kim <namhyung@gmail.com>
Tested-by: Joerg Roedel <joerg.roedel@amd.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Joerg Roedel <joerg.roedel@amd.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/n/tip-vuwxig36mzprl5n7nzvnxxsh@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

1 files changed, 20 insertions, 9 deletions

diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
index 08ed24b66ffe..d6c10e8ff6b6 100644
--- a/tools/perf/builtin-record.c
+++ b/tools/perf/builtin-record.c
@@ -205,6 +205,9 @@ static void perf_record__open(struct perf_record *rec)
 
                 if (opts->group && pos != first)
                         group_fd = first->fd;
+fallback_missing_features:
+                if (opts->exclude_guest_missing)
+                        attr->exclude_guest = attr->exclude_host = 0;
 retry_sample_id:
                 attr->sample_id_all = opts->sample_id_all_avail ? 1 : 0;
 try_again:
@@ -218,15 +221,23 @@ try_again:
                         } else if (err ==  ENODEV && opts->cpu_list) {
                                 die("No such device - did you specify"
                                         " an out-of-range profile CPU?\n");
-                        } else if (err == EINVAL && opts->sample_id_all_avail) {
-                                /*
-                                 * Old kernel, no attr->sample_id_type_all field
-                                 */
-                                opts->sample_id_all_avail = false;
-                                if (!opts->sample_time && !opts->raw_samples && !time_needed)
-                                        attr->sample_type &= ~PERF_SAMPLE_TIME;
-
-                                goto retry_sample_id;
+                        } else if (err == EINVAL) {
+                                if (!opts->exclude_guest_missing &&
+                                    (attr->exclude_guest || attr->exclude_host)) {
+                                        pr_debug("Old kernel, cannot exclude "
+                                                 "guest or host samples.\n");
+                                        opts->exclude_guest_missing = true;
+                                        goto fallback_missing_features;
+                                } else if (opts->sample_id_all_avail) {
+                                        /*
+                                         * Old kernel, no attr->sample_id_type_all field
+                                         */
+                                        opts->sample_id_all_avail = false;
+                                        if (!opts->sample_time && !opts->raw_samples && !time_needed)
+                                                attr->sample_type &= ~PERF_SAMPLE_TIME;
+
+                                        goto retry_sample_id;
+                                }
                         }
 
                         /*