suspend_stress.cpp revision 1db82f37d226bb5b7bbbaeb65952f73073de2b6f 
1/*
2 * Copyright (C) 2014 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
17#include <getopt.h>
18#include <inttypes.h>
19#include <stdio.h>
20#include <stdlib.h>
21#include <string.h>
22#include <time.h>
23
24#include <sys/epoll.h>
25#include <sys/timerfd.h>
26
27#include <cutils/klog.h>
28
29#define NSEC_PER_SEC (1000*1000*1000)
30#define MSEC_PER_SEC 1000
31#define NSEC_PER_MSEC (NSEC_PER_SEC/MSEC_PER_SEC)
32
33long long timediff_ns(const struct timespec *a, const struct timespec *b) {
34    return ((long long)(a->tv_sec - b->tv_sec)) * NSEC_PER_SEC +
35            (a->tv_nsec - b->tv_nsec);
36}
37
38void usage(void)
39{
40    printf("usage: suspend_stress [ <options> ]\n"
41           "options:\n"
42           "  -a,--abort                abort test on late alarm\n"
43           "  -c,--count=<count>        number of times to suspend (default infinite)\n"
44           "  -t,--time=<seconds>       time to suspend for (default 5)\n"
45        );
46}
47
48int main(int argc, char **argv)
49{
50    int alarm_time = 5;
51    int count = -1;
52    bool abort_on_failure = false;
53
54    while (1) {
55        const static struct option long_options[] = {
56            {"abort", no_argument, 0, 'a'},
57            {"count", required_argument, 0, 'c'},
58            {"time", required_argument, 0, 't'},
59        };
60        int c = getopt_long(argc, argv, "ac:t:", long_options, NULL);
61        if (c < 0) {
62            break;
63        }
64
65        switch (c) {
66        case 'a':
67            abort_on_failure = true;
68            break;
69        case 'c':
70            count = strtoul(optarg, NULL, 0);
71            break;
72        case 't':
73            alarm_time = strtoul(optarg, NULL, 0);
74            break;
75        case '?':
76            usage();
77            exit(EXIT_FAILURE);
78        default:
79            abort();
80        }
81    }
82
83    klog_init();
84    klog_set_level(KLOG_INFO_LEVEL);
85
86    if (optind < argc) {
87        fprintf(stderr, "Unexpected argument: %s\n", argv[optind]);
88        usage();
89        exit(EXIT_FAILURE);
90    }
91
92    int fd = timerfd_create(CLOCK_BOOTTIME_ALARM, 0);
93    if (fd < 0) {
94        perror("timerfd_create failed");
95        exit(EXIT_FAILURE);
96    }
97
98    struct itimerspec delay = itimerspec();
99    delay.it_value.tv_sec = alarm_time;
100    int i = 0;
101
102    int epoll_fd = epoll_create(1);
103    if (epoll_fd < 0) {
104        perror("epoll_create failed");
105        exit(EXIT_FAILURE);
106    }
107
108    struct epoll_event ev = epoll_event();
109    ev.events = EPOLLIN | EPOLLWAKEUP;
110    int ret = epoll_ctl(epoll_fd, EPOLL_CTL_ADD, fd, &ev);
111    if (ret < 0) {
112        perror("epoll_ctl failed");
113        exit(EXIT_FAILURE);
114    }
115
116    while (count != 0) {
117        struct timespec expected_time;
118        struct timespec actual_time;
119        uint64_t fired = 0;
120
121        ret = timerfd_settime(fd, 0, &delay, NULL);
122        if (ret < 0) {
123            perror("timerfd_settime failed");
124            exit(EXIT_FAILURE);
125        }
126
127        ret = clock_gettime(CLOCK_BOOTTIME, &expected_time);
128        if (ret < 0) {
129            perror("failed to get time");
130            exit(EXIT_FAILURE);
131        }
132        expected_time.tv_sec += alarm_time;
133
134        ret = 0;
135        while (ret != 1) {
136            struct epoll_event out_ev;
137            ret = epoll_wait(epoll_fd, &out_ev, 1, -1);
138            if (ret < 0 && errno != EINTR) {
139                perror("epoll_wait failed");
140                exit(EXIT_FAILURE);
141            }
142        }
143
144        ssize_t bytes = read(fd, &fired, sizeof(fired));
145        if (bytes < 0) {
146            perror("read from timer fd failed");
147            exit(EXIT_FAILURE);
148        } else if (bytes < (ssize_t)sizeof(fired)) {
149            fprintf(stderr, "unexpected read from timer fd: %zd\n", bytes);
150        }
151
152        if (fired != 1) {
153            fprintf(stderr, "unexpected timer fd fired count: %" PRIu64 "\n", fired);
154        }
155
156        ret = clock_gettime(CLOCK_BOOTTIME, &actual_time);
157        if (ret < 0) {
158            perror("failed to get time");
159            exit(EXIT_FAILURE);
160        }
161
162        long long diff = timediff_ns(&actual_time, &expected_time);
163        if (llabs(diff) > NSEC_PER_SEC) {
164            fprintf(stderr, "alarm arrived %lld.%03lld seconds %s\n",
165                    llabs(diff) / NSEC_PER_SEC,
166                    (llabs(diff) / NSEC_PER_MSEC) % MSEC_PER_SEC,
167                    diff > 0 ? "late" : "early");
168            KLOG_ERROR("suspend_stress", "alarm arrived %lld.%03lld seconds %s\n",
169                    llabs(diff) / NSEC_PER_SEC,
170                    (llabs(diff) / NSEC_PER_MSEC) % MSEC_PER_SEC,
171                    diff > 0 ? "late" : "early");
172            if (abort_on_failure) {
173                exit(EXIT_FAILURE);
174            }
175        }
176
177        time_t t = time(NULL);
178        i += fired;
179        printf("timer fired: %d at boottime %lld.%.3ld, %s", i,
180                   (long long)actual_time.tv_sec,
181                   actual_time.tv_nsec / NSEC_PER_MSEC,
182                   ctime(&t));
183
184        KLOG_INFO("suspend_stress", "timer fired: %d at boottime %lld.%.3ld, %s", i,
185                   (long long)actual_time.tv_sec,
186                   actual_time.tv_nsec / NSEC_PER_MSEC,
187                   ctime(&t));
188
189        if (count > 0)
190            count--;
191    }
192    return 0;
193}
194