perf record: Add basic AUX area tracing support

Amend the perf record tool to read the AUX area tracing mmap and
synthesize AUX area tracing events.

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Acked-by: Jiri Olsa <jolsa@kernel.org>
Cc: David Ahern <dsahern@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Namhyung Kim <namhyung@gmail.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/r/1428594864-29309-6-git-send-email-adrian.hunter@intel.com
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 c3efdfb..0fb11d4 100644 (file)
--- a/tools/perf/builtin-record.c
+++ b/tools/perf/builtin-record.c
@@ -27,6 +27,7 @@
 #include "util/cpumap.h"
 #include "util/thread_map.h"
 #include "util/data.h"
+#include "util/auxtrace.h"
 
 #include <unistd.h>
 #include <sched.h>
@@ -38,6 +39,7 @@ struct record {
        struct record_opts      opts;
        u64                     bytes_written;
        struct perf_data_file   file;
+       struct auxtrace_record  *itr;
        struct perf_evlist      *evlist;
        struct perf_session     *session;
        const char              *progname;
@@ -110,6 +112,44 @@ out:
        return rc;
 }
 
+static int record__process_auxtrace(struct perf_tool *tool,
+                                   union perf_event *event, void *data1,
+                                   size_t len1, void *data2, size_t len2)
+{
+       struct record *rec = container_of(tool, struct record, tool);
+       size_t padding;
+       u8 pad[8] = {0};
+
+       /* event.auxtrace.size includes padding, see __auxtrace_mmap__read() */
+       padding = (len1 + len2) & 7;
+       if (padding)
+               padding = 8 - padding;
+
+       record__write(rec, event, event->header.size);
+       record__write(rec, data1, len1);
+       if (len2)
+               record__write(rec, data2, len2);
+       record__write(rec, &pad, padding);
+
+       return 0;
+}
+
+static int record__auxtrace_mmap_read(struct record *rec,
+                                     struct auxtrace_mmap *mm)
+{
+       int ret;
+
+       ret = auxtrace_mmap__read(mm, rec->itr, &rec->tool,
+                                 record__process_auxtrace);
+       if (ret < 0)
+               return ret;
+
+       if (ret)
+               rec->samples++;
+
+       return 0;
+}
+
 static volatile int done = 0;
 static volatile int signr = -1;
 static volatile int child_finished = 0;
@@ -169,13 +209,15 @@ try_again:
                goto out;
        }
 
-       if (perf_evlist__mmap(evlist, opts->mmap_pages, false) < 0) {
+       if (perf_evlist__mmap_ex(evlist, opts->mmap_pages, false,
+                                opts->auxtrace_mmap_pages, false) < 0) {
                if (errno == EPERM) {
                        pr_err("Permission error mapping pages.\n"
                               "Consider increasing "
                               "/proc/sys/kernel/perf_event_mlock_kb,\n"
                               "or try again with a smaller value of -m/--mmap_pages.\n"
-                              "(current value: %u)\n", opts->mmap_pages);
+                              "(current value: %u,%u)\n",
+                              opts->mmap_pages, opts->auxtrace_mmap_pages);
                        rc = -errno;
                } else {
                        pr_err("failed to mmap with %d (%s)\n", errno,
@@ -270,12 +312,20 @@ static int record__mmap_read_all(struct record *rec)
        int rc = 0;
 
        for (i = 0; i < rec->evlist->nr_mmaps; i++) {
+               struct auxtrace_mmap *mm = &rec->evlist->mmap[i].auxtrace_mmap;
+
                if (rec->evlist->mmap[i].base) {
                        if (record__mmap_read(rec, i) != 0) {
                                rc = -1;
                                goto out;
                        }
                }
+
+               if (mm->base &&
+                   record__auxtrace_mmap_read(rec, mm) != 0) {
+                       rc = -1;
+                       goto out;
+               }
        }
 
        /*
@@ -305,6 +355,9 @@ static void record__init_features(struct record *rec)
 
        if (!rec->opts.branch_stack)
                perf_header__clear_feat(&session->header, HEADER_BRANCH_STACK);
+
+       if (!rec->opts.full_auxtrace)
+               perf_header__clear_feat(&session->header, HEADER_AUXTRACE);
 }
 
 static volatile int workload_exec_errno;
@@ -421,6 +474,13 @@ static int __cmd_record(struct record *rec, int argc, const char **argv)
                }
        }
 
+       if (rec->opts.full_auxtrace) {
+               err = perf_event__synthesize_auxtrace_info(rec->itr, tool,
+                                       session, process_synthesized_event);
+               if (err)
+                       goto out_delete_session;
+       }
+
        err = perf_event__synthesize_kernel_mmap(tool, process_synthesized_event,
                                                 machine);
        if (err < 0)
@@ -553,7 +613,7 @@ out_child:
        if (!err && !quiet) {
                char samples[128];
 
-               if (rec->samples)
+               if (rec->samples && !rec->opts.full_auxtrace)
                        scnprintf(samples, sizeof(samples),
                                  " (%" PRIu64 " samples)", rec->samples);
                else
@@ -936,7 +996,7 @@ struct option *record_options = __record_options;
 
 int cmd_record(int argc, const char **argv, const char *prefix __maybe_unused)
 {
-       int err = -ENOMEM;
+       int err;
        struct record *rec = &record;
        char errbuf[BUFSIZ];
 
@@ -957,6 +1017,14 @@ int cmd_record(int argc, const char **argv, const char *prefix __maybe_unused)
                usage_with_options(record_usage, record_options);
        }
 
+       if (!rec->itr) {
+               rec->itr = auxtrace_record__init(rec->evlist, &err);
+               if (err)
+                       return err;
+       }
+
+       err = -ENOMEM;
+
        symbol__init(NULL);
 
        if (symbol_conf.kptr_restrict)
@@ -1002,6 +1070,10 @@ int cmd_record(int argc, const char **argv, const char *prefix __maybe_unused)
        if (perf_evlist__create_maps(rec->evlist, &rec->opts.target) < 0)
                usage_with_options(record_usage, record_options);
 
+       err = auxtrace_record__options(rec->itr, rec->evlist, &rec->opts);
+       if (err)
+               goto out_symbol_exit;
+
        if (record_opts__config(&rec->opts)) {
                err = -EINVAL;
                goto out_symbol_exit;
@@ -1011,5 +1083,6 @@ int cmd_record(int argc, const char **argv, const char *prefix __maybe_unused)
 out_symbol_exit:
        perf_evlist__delete(rec->evlist);
        symbol__exit();
+       auxtrace_record__free(rec->itr);
        return err;
 }