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Message-ID: <20251124212301.450296-1-derek.foreman@collabora.com>
Date: Mon, 24 Nov 2025 15:23:00 -0600
From: Derek Foreman <derek.foreman@...labora.com>
To: Peter Zijlstra <peterz@...radead.org>,
Ingo Molnar <mingo@...hat.com>,
Arnaldo Carvalho de Melo <acme@...nel.org>,
Namhyung Kim <namhyung@...nel.org>,
Mark Rutland <mark.rutland@....com>,
Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
Jiri Olsa <jolsa@...nel.org>,
Ian Rogers <irogers@...gle.com>,
Adrian Hunter <adrian.hunter@...el.com>,
James Clark <james.clark@...aro.org>
Cc: kernel@...labora.com,
Derek Foreman <derek.foreman@...labora.com>,
linux-perf-users@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: [PATCH] perf data: Allow filtering conversion by start and end time
This adds a feature to allow restricting the range of converted samples
with start and end times specified in nanoseconds.
Use it like this:
$ perf data convert --to-json out.json -s 12345 -e 13340
Start, end, or both may be omitted.
Signed-off-by: Derek Foreman <derek.foreman@...labora.com>
---
tools/perf/Documentation/perf-data.txt | 6 ++++++
tools/perf/builtin-data.c | 4 ++++
tools/perf/util/data-convert-bt.c | 18 ++++++++++++++++++
tools/perf/util/data-convert-json.c | 18 ++++++++++++++++++
tools/perf/util/data-convert.h | 3 +++
5 files changed, 49 insertions(+)
diff --git a/tools/perf/Documentation/perf-data.txt b/tools/perf/Documentation/perf-data.txt
index 417bf17e265c..db0de1f354a3 100644
--- a/tools/perf/Documentation/perf-data.txt
+++ b/tools/perf/Documentation/perf-data.txt
@@ -40,6 +40,12 @@ OPTIONS for 'convert'
--force::
Don't complain, do it.
+-s::
+ Start time, in nanoseconds. Samples before this time will not be converted.
+
+-e::
+ End time, in nanoseconds. Samples after this time will not be converted.
+
-v::
--verbose::
Be more verbose (show counter open errors, etc).
diff --git a/tools/perf/builtin-data.c b/tools/perf/builtin-data.c
index ce51cbf6dc97..da813c62e284 100644
--- a/tools/perf/builtin-data.c
+++ b/tools/perf/builtin-data.c
@@ -33,6 +33,8 @@ const char *to_ctf;
struct perf_data_convert_opts opts = {
.force = false,
.all = false,
+ .range_start = 0,
+ .range_end = 0,
};
const struct option data_options[] = {
@@ -45,6 +47,8 @@ const struct option data_options[] = {
#endif
OPT_BOOLEAN('f', "force", &opts.force, "don't complain, do it"),
OPT_BOOLEAN(0, "all", &opts.all, "Convert all events"),
+ OPT_U64('s', "start", &opts.range_start, "Earliest timestamp to convert"),
+ OPT_U64('e', "end", &opts.range_end, "Latest timestamp to convert"),
OPT_END()
};
diff --git a/tools/perf/util/data-convert-bt.c b/tools/perf/util/data-convert-bt.c
index 3d2e437e1354..6819f11fe900 100644
--- a/tools/perf/util/data-convert-bt.c
+++ b/tools/perf/util/data-convert-bt.c
@@ -91,9 +91,13 @@ struct convert {
struct perf_tool tool;
struct ctf_writer writer;
+ u64 start;
+ u64 end;
+
u64 events_size;
u64 events_count;
u64 non_sample_count;
+ u64 skipped;
/* Ordered events configured queue size. */
u64 queue_size;
@@ -811,6 +815,12 @@ static int process_sample_event(const struct perf_tool *tool,
if (WARN_ONCE(!priv, "Failed to setup all events.\n"))
return 0;
+ if (sample->time < c->start ||
+ (c->end && sample->time > c->end)) {
+ ++c->skipped;
+ return 0;
+ }
+
event_class = priv->event_class;
/* update stats */
@@ -1626,6 +1636,9 @@ int bt_convert__perf2ctf(const char *input, const char *path,
c.tool.namespaces = perf_event__process_namespaces;
c.tool.ordering_requires_timestamps = true;
+ c.start = opts->range_start;
+ c.end = opts->range_end;
+
if (opts->all) {
c.tool.comm = process_comm_event;
c.tool.exit = process_exit_event;
@@ -1677,6 +1690,11 @@ int bt_convert__perf2ctf(const char *input, const char *path,
"[ perf data convert: Converted '%s' into CTF data '%s' ]\n",
data.path, path);
+ if (c.skipped)
+ fprintf(stderr,
+ "[ perf data convert: Skipped %" PRIu64 " samples",
+ c.skipped);
+
fprintf(stderr,
"[ perf data convert: Converted and wrote %.3f MB (%" PRIu64 " samples",
(double) c.events_size / 1024.0 / 1024.0,
diff --git a/tools/perf/util/data-convert-json.c b/tools/perf/util/data-convert-json.c
index 9dc1e184cf3c..dcbba34d6b08 100644
--- a/tools/perf/util/data-convert-json.c
+++ b/tools/perf/util/data-convert-json.c
@@ -35,7 +35,11 @@ struct convert_json {
struct perf_tool tool;
FILE *out;
bool first;
+ u64 start;
+ u64 end;
+
u64 events_count;
+ u64 skipped;
};
// Outputs a JSON-encoded string surrounded by quotes with characters escaped.
@@ -165,6 +169,12 @@ static int process_sample_event(const struct perf_tool *tool,
return -1;
}
+ if (sample->time < c->start ||
+ (c->end && sample->time > c->end)) {
+ ++c->skipped;
+ return 0;
+ }
+
++c->events_count;
if (c->first)
@@ -320,6 +330,9 @@ int bt_convert__perf2json(const char *input_name, const char *output_name,
struct convert_json c = {
.first = true,
.events_count = 0,
+ .start = opts->range_start,
+ .end = opts->range_end,
+ .skipped = 0,
};
struct perf_data data = {
.mode = PERF_DATA_MODE_READ,
@@ -407,6 +420,11 @@ int bt_convert__perf2json(const char *input_name, const char *output_name,
"[ perf data convert: Converted '%s' into JSON data '%s' ]\n",
data.path, output_name);
+ if (c.skipped)
+ fprintf(stderr,
+ "[ perf data convert: Skipped %" PRIu64 " samples.\n",
+ c.skipped);
+
fprintf(stderr,
"[ perf data convert: Converted and wrote %.3f MB (%" PRIu64 " samples) ]\n",
(ftell(c.out)) / 1024.0 / 1024.0, c.events_count);
diff --git a/tools/perf/util/data-convert.h b/tools/perf/util/data-convert.h
index 1b4c5f598415..5d055e1c31c8 100644
--- a/tools/perf/util/data-convert.h
+++ b/tools/perf/util/data-convert.h
@@ -3,11 +3,14 @@
#define __DATA_CONVERT_H
#include <stdbool.h>
+#include <linux/types.h>
struct perf_data_convert_opts {
bool force;
bool all;
bool tod;
+ u64 range_start;
+ u64 range_end;
};
#ifdef HAVE_LIBBABELTRACE_SUPPORT
--
2.47.3
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