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>

diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
index 08ed24b..d6c10e8 100644 (file)
--- 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;
+                               }
                        }
 
                        /*

diff --git a/tools/perf/builtin-top.c b/tools/perf/builtin-top.c
index 5a88c0d..02e11ff 100644 (file)
--- a/tools/perf/builtin-top.c
+++ b/tools/perf/builtin-top.c
@@ -872,6 +872,9 @@ static void perf_top__start_counters(struct perf_top *top)
                attr->mmap = 1;
                attr->comm = 1;
                attr->inherit = top->inherit;
+fallback_missing_features:
+               if (top->exclude_guest_missing)
+                       attr->exclude_guest = attr->exclude_host = 0;
 retry_sample_id:
                attr->sample_id_all = top->sample_id_all_avail ? 1 : 0;
 try_again:
@@ -883,12 +886,20 @@ try_again:
                        if (err == EPERM || err == EACCES) {
                                ui__error_paranoid();
                                goto out_err;
-                       } else if (err == EINVAL && top->sample_id_all_avail) {
-                               /*
-                                * Old kernel, no attr->sample_id_type_all field
-                                */
-                               top->sample_id_all_avail = false;
-                               goto retry_sample_id;
+                       } else if (err == EINVAL) {
+                               if (!top->exclude_guest_missing &&
+                                   (attr->exclude_guest || attr->exclude_host)) {
+                                       pr_debug("Old kernel, cannot exclude "
+                                                "guest or host samples.\n");
+                                       top->exclude_guest_missing = true;
+                                       goto fallback_missing_features;
+                               } else if (top->sample_id_all_avail) {
+                                       /*
+                                        * Old kernel, no attr->sample_id_type_all field
+                                        */
+                                       top->sample_id_all_avail = false;
+                                       goto retry_sample_id;
+                               }
                        }
                        /*
                         * If it's cycles then fall back to hrtimer

diff --git a/tools/perf/perf.h b/tools/perf/perf.h
index 03a0456..8b9c436 100644 (file)
--- a/tools/perf/perf.h
+++ b/tools/perf/perf.h
@@ -199,6 +199,7 @@ struct perf_record_opts {
        bool         sample_address;
        bool         sample_time;
        bool         sample_id_all_avail;
+       bool         exclude_guest_missing;
        bool         system_wide;
        bool         period;
        unsigned int freq;

diff --git a/tools/perf/util/top.h b/tools/perf/util/top.h
index 49eb848..7dea891 100644 (file)
--- a/tools/perf/util/top.h
+++ b/tools/perf/util/top.h
@@ -35,6 +35,7 @@ struct perf_top {
        bool               inherit;
        bool               group;
        bool               sample_id_all_avail;
+       bool               exclude_guest_missing;
        bool               dump_symtab;
        const char         *cpu_list;
        struct hist_entry  *sym_filter_entry;