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1#!/usr/bin/env python3
2# Copyright (C) 2019 The Android Open Source Project
3#
4# Licensed under the Apache License, Version 2.0 (the "License");
5# you may not use this file except in compliance with the License.
6# You may obtain a copy of the License at
7#
8#      http://www.apache.org/licenses/LICENSE-2.0
9#
10# Unless required by applicable law or agreed to in writing, software
11# distributed under the License is distributed on an "AS IS" BASIS,
12# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13# See the License for the specific language governing permissions and
14# limitations under the License.
15
16# This synthetic trace tests handling of the mm_id field in the rss_stat
17# event.
18
19from os import sys, path
20
21import synth_common
22
23trace = synth_common.create_trace()
24
25trace.add_packet(ts=1)
26trace.add_process(10, 0, "process")
27
28trace.add_ftrace_packet(0)
29
30# Create a kernel "thread", which is a single-thread process child of kthreadd.
31trace.add_newtask(ts=50, tid=2, new_tid=3, new_comm="kthreadd_child", flags=0)
32
33# Add an event on tid 3 which affects its own rss.
34trace.add_rss_stat(ts=90, tid=3, member=0, size=9, mm_id=4321, curr=True)
35
36# Try to add an event for tid 10. However, as we've not seen an event
37# with curr == True for tid == 10, this event will be dropped.
38trace.add_rss_stat(ts=91, tid=3, member=0, size=900, mm_id=1234, curr=False)
39
40# Add an event for tid 3 from tid 10. This emulates e.g. direct reclaim
41# where a process reaches into another process' mm struct.
42trace.add_rss_stat(ts=99, tid=10, member=0, size=10, mm_id=4321, curr=False)
43
44# Add an event on tid 10 which affects its own rss.
45trace.add_rss_stat(ts=100, tid=10, member=0, size=1000, mm_id=1234, curr=True)
46
47# Add an event on tid 10 from tid 3. This emulates e.g. background reclaim
48# where kthreadd is cleaning up the mm struct of another process.
49trace.add_rss_stat(ts=101, tid=3, member=0, size=900, mm_id=1234, curr=False)
50
51sys.stdout.buffer.write(trace.trace.SerializeToString())
52