1 files changed, 130 insertions, 0 deletions
diff --git a/simpleperf/scripts/sample_filter.py b/simpleperf/scripts/sample_filter.py
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+++ b/simpleperf/scripts/sample_filter.py
@@ -0,0 +1,130 @@
+#!/usr/bin/env python3
+#
+# Copyright (C) 2024 The Android Open Source Project
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+"""sample_filter.py: generate sample filter files, which can be passed in the
+    --filter-file option when reporting.
+
+Example:
+  ./sample_filter.py -i perf.data --split-time-range 2 -o sample_filter
+  ./gecko_profile_generator.py -i perf.data --filter-file sample_filter_part1 \
+    | gzip >profile-part1.json.gz
+  ./gecko_profile_generator.py -i perf.data --filter-file sample_filter_part2 \
+    | gzip >profile-part2.json.gz
+"""
+
+import logging
+from simpleperf_report_lib import ReportLib
+from simpleperf_utils import BaseArgumentParser
+from typing import Tuple
+
+
+class RecordFileReader:
+    def __init__(self, record_file: str):
+        self.record_file = record_file
+
+    def get_time_range(self) -> Tuple[int, int]:
+        """ Return a tuple of (min_timestamp, max_timestamp). """
+        min_timestamp = 0
+        max_timestamp = 0
+        lib = ReportLib()
+        lib.SetRecordFile(self.record_file)
+        while True:
+            sample = lib.GetNextSample()
+            if not sample:
+                break
+            if not min_timestamp or sample.time < min_timestamp:
+                min_timestamp = sample.time
+            if not max_timestamp or sample.time > max_timestamp:
+                max_timestamp = sample.time
+        lib.Close()
+        return (min_timestamp, max_timestamp)
+
+
+def show_time_range(record_file: str) -> None:
+    reader = RecordFileReader(record_file)
+    time_range = reader.get_time_range()
+    print('time range of samples is %.3f s' % ((time_range[1] - time_range[0]) / 1e9))
+
+
+def filter_samples(
+        record_file: str, split_time_range: int, exclude_first_seconds: int,
+        exclude_last_seconds: int, output_file_prefix: str) -> None:
+    reader = RecordFileReader(record_file)
+    min_timestamp, max_timestamp = reader.get_time_range()
+    comment = 'total time range: %d seconds' % ((max_timestamp - min_timestamp) // 1e9)
+    if exclude_first_seconds:
+        min_timestamp += int(exclude_first_seconds * 1e9)
+        comment += ', exclude first %d seconds' % exclude_first_seconds
+    if exclude_last_seconds:
+        max_timestamp -= int(exclude_last_seconds * 1e9)
+        comment += ', exclude last %d seconds' % exclude_last_seconds
+    if min_timestamp > max_timestamp:
+        logging.error('All samples are filtered out')
+        return
+    if not split_time_range:
+        output_file = output_file_prefix
+        with open(output_file, 'w') as fh:
+            fh.write('// %s\n' % comment)
+            fh.write('GLOBAL_BEGIN %d\n' % min_timestamp)
+            fh.write('GLOBAL_END %d\n' % max_timestamp)
+        print('Generate sample filter file: %s' % output_file)
+    else:
+        step = (max_timestamp - min_timestamp) // split_time_range
+        cur_timestamp = min_timestamp
+        for i in range(split_time_range):
+            output_file = output_file_prefix + '_part%s' % (i + 1)
+            with open(output_file, 'w') as fh:
+                time_range_comment = 'current range: %d to %d seconds' % (
+                    (cur_timestamp - min_timestamp) // 1e9,
+                    (cur_timestamp + step - min_timestamp) // 1e9)
+                fh.write('// %s, %s\n' % (comment, time_range_comment))
+                fh.write('GLOBAL_BEGIN %d\n' % cur_timestamp)
+                if i == split_time_range - 1:
+                    cur_timestamp = max_timestamp
+                else:
+                    cur_timestamp += step
+                fh.write('GLOBAL_END %d\n' % (cur_timestamp + 1))
+                cur_timestamp += 1
+            print('Generate sample filter file: %s' % output_file)
+
+
+def main():
+    parser = BaseArgumentParser(description=__doc__)
+    parser.add_argument('-i', '--record-file', nargs='?', default='perf.data',
+                        help='Default is perf.data.')
+    parser.add_argument('--show-time-range', action='store_true', help='show time range of samples')
+    parser.add_argument('--split-time-range', type=int,
+                        help='split time ranges of samples into several parts')
+    parser.add_argument('--exclude-first-seconds', type=int,
+                        help='exclude samples recorded in the first seconds')
+    parser.add_argument('--exclude-last-seconds', type=int,
+                        help='exclude samples recorded in the last seconds')
+    parser.add_argument(
+        '-o', '--output-file-prefix', default='sample_filter',
+        help='prefix for the generated sample filter files')
+    args = parser.parse_args()
+
+    if args.show_time_range:
+        show_time_range(args.record_file)
+
+    if args.split_time_range or args.exclude_first_seconds or args.exclude_last_seconds:
+        filter_samples(args.record_file, args.split_time_range, args.exclude_first_seconds,
+                       args.exclude_last_seconds, args.output_file_prefix)
+
+
+if __name__ == '__main__':
+    main()