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Date: Mon, 19 Jul 2021 15:31:52 -0700
From: Namhyung Kim <namhyung@...nel.org>
To: Arnaldo Carvalho de Melo <acme@...nel.org>,
Jiri Olsa <jolsa@...hat.com>
Cc: Ingo Molnar <mingo@...nel.org>,
Peter Zijlstra <peterz@...radead.org>,
LKML <linux-kernel@...r.kernel.org>,
Andi Kleen <ak@...ux.intel.com>,
Ian Rogers <irogers@...gle.com>,
Adrian Hunter <adrian.hunter@...el.com>
Subject: [PATCH 4/5] perf inject: Fix output from a file to a pipe
When the input is a regular file but the output is a pipe, it should
write a pipe header. But just repiping would write a portion of the
existing header which is different in 'size' value. So we need to
prevent it and write a new pipe header along with other information
like event attributes and features.
This can handle something like this:
# perf record -a -B sleep 1
# perf inject -b -i perf.data | perf report -i -
Factor out perf_event__synthesize_for_pipe() to be shared between perf
record and inject.
Signed-off-by: Namhyung Kim <namhyung@...nel.org>
---
tools/perf/builtin-inject.c | 28 ++++++++++++++--
tools/perf/builtin-record.c | 38 +++------------------
tools/perf/util/synthetic-events.c | 53 +++++++++++++++++++++++++++++-
tools/perf/util/synthetic-events.h | 6 ++++
4 files changed, 88 insertions(+), 37 deletions(-)
diff --git a/tools/perf/builtin-inject.c b/tools/perf/builtin-inject.c
index 7c126597d3f5..0bdd824d8864 100644
--- a/tools/perf/builtin-inject.c
+++ b/tools/perf/builtin-inject.c
@@ -918,6 +918,7 @@ int cmd_inject(int argc, const char **argv)
.use_stdio = true,
};
int ret;
+ bool repipe = true;
struct option options[] = {
OPT_BOOLEAN('b', "build-ids", &inject.build_ids,
@@ -992,10 +993,18 @@ int cmd_inject(int argc, const char **argv)
}
data.path = inject.input_name;
- if (!strcmp(inject.input_name, "-") || inject.output.is_pipe)
+ if (!strcmp(inject.input_name, "-") || inject.output.is_pipe) {
inject.is_pipe = true;
+ /*
+ * Do not repipe header when input is a regular file
+ * since either it can rewrite the header at the end
+ * or write a new pipe header.
+ */
+ if (strcmp(inject.input_name, "-"))
+ repipe = false;
+ }
- inject.session = __perf_session__new(&data, inject.is_pipe,
+ inject.session = __perf_session__new(&data, repipe,
perf_data__fd(&inject.output),
&inject.tool);
if (IS_ERR(inject.session))
@@ -1004,6 +1013,21 @@ int cmd_inject(int argc, const char **argv)
if (zstd_init(&(inject.session->zstd_data), 0) < 0)
pr_warning("Decompression initialization failed.\n");
+ if (!data.is_pipe && inject.output.is_pipe) {
+ ret = perf_header__write_pipe(perf_data__fd(&inject.output));
+ if (ret < 0) {
+ pr_err("Couldn't write a new pipe header.\n");
+ goto out_delete;
+ }
+
+ ret = perf_event__synthesize_for_pipe(&inject.tool,
+ inject.session,
+ &inject.output,
+ perf_event__repipe);
+ if (ret < 0)
+ goto out_delete;
+ }
+
if (inject.build_ids && !inject.build_id_all) {
/*
* to make sure the mmap records are ordered correctly
diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
index 472cd12f10c6..548c1dbde6c5 100644
--- a/tools/perf/builtin-record.c
+++ b/tools/perf/builtin-record.c
@@ -1387,7 +1387,6 @@ static int record__synthesize(struct record *rec, bool tail)
struct perf_data *data = &rec->data;
struct record_opts *opts = &rec->opts;
struct perf_tool *tool = &rec->tool;
- int fd = perf_data__fd(data);
int err = 0;
event_op f = process_synthesized_event;
@@ -1395,41 +1394,12 @@ static int record__synthesize(struct record *rec, bool tail)
return 0;
if (data->is_pipe) {
- /*
- * We need to synthesize events first, because some
- * features works on top of them (on report side).
- */
- err = perf_event__synthesize_attrs(tool, rec->evlist,
- process_synthesized_event);
- if (err < 0) {
- pr_err("Couldn't synthesize attrs.\n");
- goto out;
- }
-
- err = perf_event__synthesize_features(tool, session, rec->evlist,
+ err = perf_event__synthesize_for_pipe(tool, session, data,
process_synthesized_event);
- if (err < 0) {
- pr_err("Couldn't synthesize features.\n");
- return err;
- }
+ if (err < 0)
+ goto out;
- if (have_tracepoints(&rec->evlist->core.entries)) {
- /*
- * FIXME err <= 0 here actually means that
- * there were no tracepoints so its not really
- * an error, just that we don't need to
- * synthesize anything. We really have to
- * return this more properly and also
- * propagate errors that now are calling die()
- */
- err = perf_event__synthesize_tracing_data(tool, fd, rec->evlist,
- process_synthesized_event);
- if (err <= 0) {
- pr_err("Couldn't record tracing data.\n");
- goto out;
- }
- rec->bytes_written += err;
- }
+ rec->bytes_written += err;
}
err = perf_event__synth_time_conv(record__pick_pc(rec), tool,
diff --git a/tools/perf/util/synthetic-events.c b/tools/perf/util/synthetic-events.c
index 35aa0c0f7cd9..a7e981b2d7de 100644
--- a/tools/perf/util/synthetic-events.c
+++ b/tools/perf/util/synthetic-events.c
@@ -1,5 +1,7 @@
// SPDX-License-Identifier: GPL-2.0-only
+#include "util/cgroup.h"
+#include "util/data.h"
#include "util/debug.h"
#include "util/dso.h"
#include "util/event.h"
@@ -16,7 +18,6 @@
#include "util/synthetic-events.h"
#include "util/target.h"
#include "util/time-utils.h"
-#include "util/cgroup.h"
#include <linux/bitops.h>
#include <linux/kernel.h>
#include <linux/string.h>
@@ -2179,3 +2180,53 @@ int perf_event__synthesize_features(struct perf_tool *tool, struct perf_session
free(ff.buf);
return ret;
}
+
+int perf_event__synthesize_for_pipe(struct perf_tool *tool,
+ struct perf_session *session,
+ struct perf_data *data,
+ perf_event__handler_t process)
+{
+ int err;
+ int ret = 0;
+ struct evlist *evlist = session->evlist;
+
+ /*
+ * We need to synthesize events first, because some
+ * features works on top of them (on report side).
+ */
+ err = perf_event__synthesize_attrs(tool, evlist, process);
+ if (err < 0) {
+ pr_err("Couldn't synthesize attrs.\n");
+ return err;
+ }
+ ret += err;
+
+ err = perf_event__synthesize_features(tool, session, evlist, process);
+ if (err < 0) {
+ pr_err("Couldn't synthesize features.\n");
+ return err;
+ }
+ ret += err;
+
+ if (have_tracepoints(&evlist->core.entries)) {
+ int fd = perf_data__fd(data);
+
+ /*
+ * FIXME err <= 0 here actually means that
+ * there were no tracepoints so its not really
+ * an error, just that we don't need to
+ * synthesize anything. We really have to
+ * return this more properly and also
+ * propagate errors that now are calling die()
+ */
+ err = perf_event__synthesize_tracing_data(tool, fd, evlist,
+ process);
+ if (err <= 0) {
+ pr_err("Couldn't record tracing data.\n");
+ return err;
+ }
+ ret += err;
+ }
+
+ return ret;
+}
diff --git a/tools/perf/util/synthetic-events.h b/tools/perf/util/synthetic-events.h
index e7a3e9589738..c845e2b9b444 100644
--- a/tools/perf/util/synthetic-events.h
+++ b/tools/perf/util/synthetic-events.h
@@ -14,6 +14,7 @@ struct evsel;
struct machine;
struct perf_counts_values;
struct perf_cpu_map;
+struct perf_data;
struct perf_event_attr;
struct perf_event_mmap_page;
struct perf_sample;
@@ -101,4 +102,9 @@ static inline int perf_event__synthesize_bpf_events(struct perf_session *session
}
#endif // HAVE_LIBBPF_SUPPORT
+int perf_event__synthesize_for_pipe(struct perf_tool *tool,
+ struct perf_session *session,
+ struct perf_data *data,
+ perf_event__handler_t process);
+
#endif // __PERF_SYNTHETIC_EVENTS_H
--
2.32.0.402.g57bb445576-goog
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