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SubjectRe: [PATCH V7 05/25] perf record: Add basic AUX area tracing support
On Tue, Mar 31, 2015 at 02:38:34PM +0300, Adrian Hunter wrote:
> 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>

> ---
> 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 18aad239..0de9432 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
> @@ -849,7 +909,7 @@ 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];
>
> @@ -870,6 +930,14 @@ 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)
> @@ -915,6 +983,10 @@ 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;
> @@ -924,5 +996,6 @@ 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;
> }
> --
> 1.9.1
>


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