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Date: Wed, 11 Dec 2013 14:36:55 +0200
From: Alexander Shishkin <alexander.shishkin@...ux.intel.com>
To: Peter Zijlstra <a.p.zijlstra@...llo.nl>,
Arnaldo Carvalho de Melo <acme@...stprotocols.net>
Cc: Ingo Molnar <mingo@...hat.com>, linux-kernel@...r.kernel.org,
David Ahern <dsahern@...il.com>,
Frederic Weisbecker <fweisbec@...il.com>,
Jiri Olsa <jolsa@...hat.com>, Mike Galbraith <efault@....de>,
Namhyung Kim <namhyung@...il.com>,
Paul Mackerras <paulus@...ba.org>,
Stephane Eranian <eranian@...gle.com>,
Andi Kleen <ak@...ux.intel.com>,
Adrian Hunter <adrian.hunter@...el.com>
Subject: [PATCH v0 43/71] perf record: Add basic Instruction Tracing support
From: Adrian Hunter <adrian.hunter@...el.com>
Amend the perf record tool to read the
Instruction Tracing mmap and synthesize
Instruction Tracing events.
Signed-off-by: Adrian Hunter <adrian.hunter@...el.com>
---
tools/perf/builtin-record.c | 103 +++++++++++++++++++++++++++++++++++++-------
1 file changed, 87 insertions(+), 16 deletions(-)
diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
index d93e2ee..4613f55 100644
--- a/tools/perf/builtin-record.c
+++ b/tools/perf/builtin-record.c
@@ -25,6 +25,7 @@
#include "util/cpumap.h"
#include "util/thread_map.h"
#include "util/data.h"
+#include "util/itrace.h"
#include <unistd.h>
#include <sched.h>
@@ -67,6 +68,7 @@ struct perf_record {
struct perf_record_opts opts;
u64 bytes_written;
struct perf_data_file file;
+ struct itrace_record *itr;
struct perf_evlist *evlist;
struct perf_session *session;
const char *progname;
@@ -150,6 +152,42 @@ out:
return rc;
}
+static int perf_record__process_itrace(struct perf_tool *tool,
+ union perf_event *event, void *data1,
+ size_t len1, void *data2, size_t len2)
+{
+ struct perf_record *rec = container_of(tool, struct perf_record, tool);
+ size_t padding;
+ u8 pad[8] = {0};
+
+ padding = (len1 + len2) & 7;
+ if (padding)
+ padding = 8 - padding;
+
+ perf_record__write(rec, event, event->header.size);
+ perf_record__write(rec, data1, len1);
+ perf_record__write(rec, data2, len2);
+ perf_record__write(rec, &pad, padding);
+
+ return 0;
+}
+
+static int perf_record__itrace_mmap_read(struct perf_record *rec,
+ struct itrace_mmap *mm)
+{
+ int ret;
+
+ ret = itrace_mmap__read(mm, rec->itr, &rec->tool,
+ perf_record__process_itrace);
+ 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;
@@ -218,13 +256,16 @@ 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->itrace_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: %d)\n", opts->mmap_pages);
+ "(current value: %u,%u)\n",
+ opts->mmap_pages, opts->itrace_mmap_pages);
rc = -errno;
} else {
pr_err("failed to mmap with %d (%s)\n", errno, strerror(errno));
@@ -318,12 +359,20 @@ static int perf_record__mmap_read_all(struct perf_record *rec)
int rc = 0;
for (i = 0; i < rec->evlist->nr_mmaps; i++) {
+ struct itrace_mmap *mm = &rec->evlist->mmap[i].itrace_mmap;
+
if (rec->evlist->mmap[i].base) {
if (perf_record__mmap_read(rec, &rec->evlist->mmap[i]) != 0) {
rc = -1;
goto out;
}
}
+
+ if (mm->base &&
+ perf_record__itrace_mmap_read(rec, mm) != 0) {
+ rc = -1;
+ goto out;
+ }
}
if (perf_header__has_feat(&rec->session->header, HEADER_TRACING_DATA))
@@ -351,6 +400,9 @@ static void perf_record__init_features(struct perf_record *rec)
if (!rec->opts.branch_stack)
perf_header__clear_feat(&session->header, HEADER_BRANCH_STACK);
+
+ if (!rec->opts.full_itrace)
+ perf_header__clear_feat(&session->header, HEADER_ITRACE);
}
static int __cmd_record(struct perf_record *rec, int argc, const char **argv)
@@ -455,6 +507,13 @@ static int __cmd_record(struct perf_record *rec, int argc, const char **argv)
}
}
+ if (rec->opts.full_itrace) {
+ err = perf_event__synthesize_itrace_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, "_text");
if (err < 0)
@@ -536,16 +595,17 @@ static int __cmd_record(struct perf_record *rec, int argc, const char **argv)
if (quiet || signr == SIGUSR1)
return 0;
- fprintf(stderr, "[ perf record: Woken up %ld times to write data ]\n", waking);
-
- /*
- * Approximate RIP event size: 24 bytes.
- */
- fprintf(stderr,
- "[ perf record: Captured and wrote %.3f MB %s (~%" PRIu64 " samples) ]\n",
- (double)rec->bytes_written / 1024.0 / 1024.0,
- file->path,
- rec->bytes_written / 24);
+ fprintf(stderr, "[ perf record: Woken up %ld times to write data ]\n",
+ waking);
+ fprintf(stderr, "[ perf record: Captured and wrote %.3f MB %s",
+ (double)rec->bytes_written / 1024.0 / 1024.0, file->path);
+ if (rec->opts.full_itrace) {
+ fprintf(stderr, " ]\n");
+ } else {
+ /* Approximate RIP event size: 24 bytes */
+ fprintf(stderr, " (~%" PRIu64 " samples) ]\n",
+ rec->bytes_written / 24);
+ }
return 0;
@@ -889,14 +949,19 @@ const struct option record_options[] = {
int cmd_record(int argc, const char **argv, const char *prefix __maybe_unused)
{
- int err = -ENOMEM;
+ int err;
struct perf_evlist *evsel_list;
struct perf_record *rec = &record;
char errbuf[BUFSIZ];
+ rec->itr = itrace_record__init(&err);
+ if (err)
+ return err;
+
+ err = -ENOMEM;
evsel_list = perf_evlist__new();
if (evsel_list == NULL)
- return -ENOMEM;
+ goto out_itrace_free;
rec->evlist = evsel_list;
@@ -956,18 +1021,24 @@ int cmd_record(int argc, const char **argv, const char *prefix __maybe_unused)
if (perf_evlist__create_maps(evsel_list, &rec->opts.target) < 0)
usage_with_options(record_usage, record_options);
+ err = itrace_record__options(rec->itr, evsel_list, &rec->opts);
+ if (err)
+ goto out_symbol_exit;
+
if (perf_record_opts__config(&rec->opts)) {
err = -EINVAL;
- goto out_free_fd;
+ goto out_delete_maps;
}
err = __cmd_record(&record, argc, argv);
perf_evlist__munmap(evsel_list);
perf_evlist__close(evsel_list);
-out_free_fd:
+out_delete_maps:
perf_evlist__delete_maps(evsel_list);
out_symbol_exit:
symbol__exit();
+out_itrace_free:
+ itrace_record__free(rec->itr);
return err;
}
--
1.8.5.1
--
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