[tip:perf/core] perf record: Add basic AUX area tracing support

From: tip-bot for Adrian Hunter
Date: Tue May 05 2015 - 23:00:26 EST

Commit-ID: ef149c2548b82e75f7f9d138457ef4dc4ed97448
Gitweb: http://git.kernel.org/tip/ef149c2548b82e75f7f9d138457ef4dc4ed97448
Author: Adrian Hunter <adrian.hunter@xxxxxxxxx>
AuthorDate: Thu, 9 Apr 2015 18:53:45 +0300
Committer: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
CommitDate: Wed, 29 Apr 2015 10:37:51 -0300

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@xxxxxxxxx>
Acked-by: Jiri Olsa <jolsa@xxxxxxxxxx>
Cc: David Ahern <dsahern@xxxxxxxxx>
Cc: Frederic Weisbecker <fweisbec@xxxxxxxxx>
Cc: Namhyung Kim <namhyung@xxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Stephane Eranian <eranian@xxxxxxxxxx>
Link: http://lkml.kernel.org/r/1428594864-29309-6-git-send-email-adrian.hunter@xxxxxxxxx
Signed-off-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
---
tools/perf/builtin-record.c | 81 ++++++++++++++++++++++++++++++++++++++++++---
1 file changed, 77 insertions(+), 4 deletions(-)

diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
index c3efdfb..0fb11d4 100644
--- 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;
}
--
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