714 lines
22 KiB
C++
714 lines
22 KiB
C++
/*
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* Copyright (C) 2012 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <errno.h>
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#include <fcntl.h>
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#include <getopt.h>
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#include <signal.h>
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#include <stdarg.h>
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#include <stdbool.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <sys/sendfile.h>
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#include <time.h>
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#include <zlib.h>
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#include <binder/IBinder.h>
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#include <binder/IServiceManager.h>
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#include <binder/Parcel.h>
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#include <cutils/properties.h>
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#include <utils/String8.h>
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#include <utils/Trace.h>
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using namespace android;
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#define NELEM(x) ((int) (sizeof(x) / sizeof((x)[0])))
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enum { MAX_SYS_FILES = 8 };
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const char* k_traceTagsProperty = "debug.atrace.tags.enableflags";
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typedef enum { OPT, REQ } requiredness ;
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struct TracingCategory {
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// The name identifying the category.
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const char* name;
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// A longer description of the category.
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const char* longname;
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// The userland tracing tags that the category enables.
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uint64_t tags;
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// The fname==NULL terminated list of /sys/ files that the category
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// enables.
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struct {
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// Whether the file must be writable in order to enable the tracing
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// category.
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requiredness required;
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// The path to the enable file.
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const char* path;
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} sysfiles[MAX_SYS_FILES];
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};
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/* Tracing categories */
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static const TracingCategory k_categories[] = {
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{ "gfx", "Graphics", ATRACE_TAG_GRAPHICS, { } },
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{ "input", "Input", ATRACE_TAG_INPUT, { } },
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{ "view", "View System", ATRACE_TAG_VIEW, { } },
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{ "wm", "Window Manager", ATRACE_TAG_WINDOW_MANAGER, { } },
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{ "am", "Activity Manager", ATRACE_TAG_ACTIVITY_MANAGER, { } },
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{ "audio", "Audio", ATRACE_TAG_AUDIO, { } },
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{ "video", "Video", ATRACE_TAG_VIDEO, { } },
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{ "camera", "Camera", ATRACE_TAG_CAMERA, { } },
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{ "sched", "CPU Scheduling", 0, {
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{ REQ, "/sys/kernel/debug/tracing/events/sched/sched_switch/enable" },
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{ REQ, "/sys/kernel/debug/tracing/events/sched/sched_wakeup/enable" },
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} },
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{ "freq", "CPU Frequency", 0, {
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{ REQ, "/sys/kernel/debug/tracing/events/power/cpu_frequency/enable" },
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{ OPT, "/sys/kernel/debug/tracing/events/power/clock_set_rate/enable" },
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} },
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{ "membus", "Memory Bus Utilization", 0, {
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{ REQ, "/sys/kernel/debug/tracing/events/memory_bus/enable" },
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} },
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{ "idle", "CPU Idle", 0, {
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{ REQ, "/sys/kernel/debug/tracing/events/power/cpu_idle/enable" },
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} },
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{ "disk", "Disk I/O", 0, {
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{ REQ, "/sys/kernel/debug/tracing/events/ext4/ext4_sync_file_enter/enable" },
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{ REQ, "/sys/kernel/debug/tracing/events/ext4/ext4_sync_file_exit/enable" },
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{ REQ, "/sys/kernel/debug/tracing/events/block/block_rq_issue/enable" },
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{ REQ, "/sys/kernel/debug/tracing/events/block/block_rq_complete/enable" },
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} },
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{ "load", "CPU Load", 0, {
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{ REQ, "/sys/kernel/debug/tracing/events/cpufreq_interactive/enable" },
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} },
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{ "sync", "Synchronization", 0, {
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{ REQ, "/sys/kernel/debug/tracing/events/sync/enable" },
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} },
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{ "workq", "Kernel Workqueues", 0, {
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{ REQ, "/sys/kernel/debug/tracing/events/workqueue/enable" },
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} },
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};
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/* Command line options */
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static int g_traceDurationSeconds = 5;
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static bool g_traceOverwrite = false;
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static int g_traceBufferSizeKB = 2048;
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static bool g_compress = false;
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static bool g_nohup = false;
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static int g_initialSleepSecs = 0;
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/* Global state */
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static bool g_traceAborted = false;
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static bool g_categoryEnables[NELEM(k_categories)] = {};
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/* Sys file paths */
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static const char* k_traceClockPath =
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"/sys/kernel/debug/tracing/trace_clock";
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static const char* k_traceBufferSizePath =
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"/sys/kernel/debug/tracing/buffer_size_kb";
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static const char* k_tracingOverwriteEnablePath =
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"/sys/kernel/debug/tracing/options/overwrite";
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static const char* k_tracingOnPath =
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"/sys/kernel/debug/tracing/tracing_on";
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static const char* k_tracePath =
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"/sys/kernel/debug/tracing/trace";
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// Check whether a file exists.
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static bool fileExists(const char* filename) {
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return access(filename, F_OK) != -1;
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}
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// Check whether a file is writable.
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static bool fileIsWritable(const char* filename) {
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return access(filename, W_OK) != -1;
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}
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// Write a string to a file, returning true if the write was successful.
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static bool writeStr(const char* filename, const char* str)
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{
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int fd = open(filename, O_WRONLY);
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if (fd == -1) {
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fprintf(stderr, "error opening %s: %s (%d)\n", filename,
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strerror(errno), errno);
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return false;
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}
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bool ok = true;
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ssize_t len = strlen(str);
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if (write(fd, str, len) != len) {
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fprintf(stderr, "error writing to %s: %s (%d)\n", filename,
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strerror(errno), errno);
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ok = false;
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}
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close(fd);
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return ok;
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}
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// Enable or disable a kernel option by writing a "1" or a "0" into a /sys
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// file.
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static bool setKernelOptionEnable(const char* filename, bool enable)
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{
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return writeStr(filename, enable ? "1" : "0");
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}
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// Check whether the category is supported on the device with the current
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// rootness. A category is supported only if all its required /sys/ files are
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// writable and if enabling the category will enable one or more tracing tags
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// or /sys/ files.
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static bool isCategorySupported(const TracingCategory& category)
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{
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bool ok = category.tags != 0;
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for (int i = 0; i < MAX_SYS_FILES; i++) {
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const char* path = category.sysfiles[i].path;
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bool req = category.sysfiles[i].required == REQ;
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if (path != NULL) {
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if (req) {
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if (!fileIsWritable(path)) {
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return false;
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} else {
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ok = true;
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}
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} else {
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ok |= fileIsWritable(path);
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}
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}
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}
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return ok;
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}
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// Check whether the category would be supported on the device if the user
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// were root. This function assumes that root is able to write to any file
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// that exists. It performs the same logic as isCategorySupported, but it
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// uses file existance rather than writability in the /sys/ file checks.
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static bool isCategorySupportedForRoot(const TracingCategory& category)
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{
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bool ok = category.tags != 0;
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for (int i = 0; i < MAX_SYS_FILES; i++) {
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const char* path = category.sysfiles[i].path;
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bool req = category.sysfiles[i].required == REQ;
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if (path != NULL) {
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if (req) {
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if (!fileExists(path)) {
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return false;
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} else {
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ok = true;
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}
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} else {
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ok |= fileExists(path);
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}
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}
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}
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return ok;
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}
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// Enable or disable overwriting of the kernel trace buffers. Disabling this
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// will cause tracing to stop once the trace buffers have filled up.
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static bool setTraceOverwriteEnable(bool enable)
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{
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return setKernelOptionEnable(k_tracingOverwriteEnablePath, enable);
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}
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// Enable or disable kernel tracing.
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static bool setTracingEnabled(bool enable)
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{
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return setKernelOptionEnable(k_tracingOnPath, enable);
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}
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// Clear the contents of the kernel trace.
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static bool clearTrace()
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{
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int traceFD = creat(k_tracePath, 0);
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if (traceFD == -1) {
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fprintf(stderr, "error truncating %s: %s (%d)\n", k_tracePath,
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strerror(errno), errno);
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return false;
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}
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close(traceFD);
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return true;
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}
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// Set the size of the kernel's trace buffer in kilobytes.
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static bool setTraceBufferSizeKB(int size)
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{
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char str[32] = "1";
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int len;
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if (size < 1) {
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size = 1;
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}
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snprintf(str, 32, "%d", size);
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return writeStr(k_traceBufferSizePath, str);
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}
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// Enable or disable the kernel's use of the global clock. Disabling the global
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// clock will result in the kernel using a per-CPU local clock.
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static bool setGlobalClockEnable(bool enable)
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{
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return writeStr(k_traceClockPath, enable ? "global" : "local");
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}
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// Poke all the binder-enabled processes in the system to get them to re-read
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// their system properties.
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static bool pokeBinderServices()
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{
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sp<IServiceManager> sm = defaultServiceManager();
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Vector<String16> services = sm->listServices();
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for (size_t i = 0; i < services.size(); i++) {
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sp<IBinder> obj = sm->checkService(services[i]);
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if (obj != NULL) {
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Parcel data;
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if (obj->transact(IBinder::SYSPROPS_TRANSACTION, data,
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NULL, 0) != OK) {
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if (false) {
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// XXX: For some reason this fails on tablets trying to
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// poke the "phone" service. It's not clear whether some
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// are expected to fail.
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String8 svc(services[i]);
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fprintf(stderr, "error poking binder service %s\n",
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svc.string());
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return false;
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}
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}
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}
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}
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return true;
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}
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// Set the trace tags that userland tracing uses, and poke the running
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// processes to pick up the new value.
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static bool setTagsProperty(uint64_t tags)
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{
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char buf[64];
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snprintf(buf, 64, "%#llx", tags);
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if (property_set(k_traceTagsProperty, buf) < 0) {
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fprintf(stderr, "error setting trace tags system property\n");
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return false;
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}
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return pokeBinderServices();
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}
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// Disable all /sys/ enable files.
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static bool disableKernelTraceEvents() {
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bool ok = true;
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for (int i = 0; i < NELEM(k_categories); i++) {
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const TracingCategory &c = k_categories[i];
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for (int j = 0; j < MAX_SYS_FILES; j++) {
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const char* path = c.sysfiles[j].path;
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if (path != NULL && fileIsWritable(path)) {
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ok &= setKernelOptionEnable(path, false);
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}
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}
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}
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return ok;
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}
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// Enable tracing in the kernel.
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static bool startTrace()
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{
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bool ok = true;
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// Set up the tracing options.
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ok &= setTraceOverwriteEnable(g_traceOverwrite);
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ok &= setTraceBufferSizeKB(g_traceBufferSizeKB);
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ok &= setGlobalClockEnable(true);
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// Set up the tags property.
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uint64_t tags = 0;
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for (int i = 0; i < NELEM(k_categories); i++) {
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if (g_categoryEnables[i]) {
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const TracingCategory &c = k_categories[i];
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tags |= c.tags;
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}
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}
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ok &= setTagsProperty(tags);
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// Disable all the sysfs enables. This is done as a separate loop from
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// the enables to allow the same enable to exist in multiple categories.
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ok &= disableKernelTraceEvents();
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// Enable all the sysfs enables that are in an enabled category.
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for (int i = 0; i < NELEM(k_categories); i++) {
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if (g_categoryEnables[i]) {
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const TracingCategory &c = k_categories[i];
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for (int j = 0; j < MAX_SYS_FILES; j++) {
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const char* path = c.sysfiles[j].path;
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bool required = c.sysfiles[j].required == REQ;
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if (path != NULL) {
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if (fileIsWritable(path)) {
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ok &= setKernelOptionEnable(path, true);
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} else if (required) {
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fprintf(stderr, "error writing file %s\n", path);
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ok = false;
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}
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}
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}
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}
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}
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// Enable tracing.
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ok &= setTracingEnabled(true);
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return ok;
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}
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// Disable tracing in the kernel.
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static void stopTrace()
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{
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// Disable tracing.
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setTracingEnabled(false);
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// Disable all tracing that we're able to.
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disableKernelTraceEvents();
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// Disable all the trace tags.
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setTagsProperty(0);
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// Set the options back to their defaults.
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setTraceOverwriteEnable(true);
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setGlobalClockEnable(false);
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// Note that we can't reset the trace buffer size here because that would
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// clear the trace before we've read it.
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}
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// Read the current kernel trace and write it to stdout.
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static void dumpTrace()
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{
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int traceFD = open(k_tracePath, O_RDWR);
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if (traceFD == -1) {
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fprintf(stderr, "error opening %s: %s (%d)\n", k_tracePath,
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strerror(errno), errno);
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return;
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}
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if (g_compress) {
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z_stream zs;
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uint8_t *in, *out;
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int result, flush;
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bzero(&zs, sizeof(zs));
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result = deflateInit(&zs, Z_DEFAULT_COMPRESSION);
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if (result != Z_OK) {
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fprintf(stderr, "error initializing zlib: %d\n", result);
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close(traceFD);
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return;
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}
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const size_t bufSize = 64*1024;
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in = (uint8_t*)malloc(bufSize);
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out = (uint8_t*)malloc(bufSize);
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flush = Z_NO_FLUSH;
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zs.next_out = out;
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zs.avail_out = bufSize;
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do {
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if (zs.avail_in == 0) {
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// More input is needed.
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result = read(traceFD, in, bufSize);
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if (result < 0) {
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fprintf(stderr, "error reading trace: %s (%d)\n",
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strerror(errno), errno);
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result = Z_STREAM_END;
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break;
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} else if (result == 0) {
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flush = Z_FINISH;
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} else {
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zs.next_in = in;
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zs.avail_in = result;
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}
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}
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if (zs.avail_out == 0) {
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// Need to write the output.
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result = write(STDOUT_FILENO, out, bufSize);
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if ((size_t)result < bufSize) {
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fprintf(stderr, "error writing deflated trace: %s (%d)\n",
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strerror(errno), errno);
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result = Z_STREAM_END; // skip deflate error message
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zs.avail_out = bufSize; // skip the final write
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break;
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}
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zs.next_out = out;
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zs.avail_out = bufSize;
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}
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} while ((result = deflate(&zs, flush)) == Z_OK);
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if (result != Z_STREAM_END) {
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fprintf(stderr, "error deflating trace: %s\n", zs.msg);
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}
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if (zs.avail_out < bufSize) {
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size_t bytes = bufSize - zs.avail_out;
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result = write(STDOUT_FILENO, out, bytes);
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if ((size_t)result < bytes) {
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fprintf(stderr, "error writing deflated trace: %s (%d)\n",
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strerror(errno), errno);
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}
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}
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result = deflateEnd(&zs);
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if (result != Z_OK) {
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fprintf(stderr, "error cleaning up zlib: %d\n", result);
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}
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free(in);
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free(out);
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} else {
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ssize_t sent = 0;
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while ((sent = sendfile(STDOUT_FILENO, traceFD, NULL, 64*1024*1024)) > 0);
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if (sent == -1) {
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fprintf(stderr, "error dumping trace: %s (%d)\n", strerror(errno),
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errno);
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}
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}
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close(traceFD);
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}
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static void handleSignal(int signo)
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{
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if (!g_nohup) {
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g_traceAborted = true;
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}
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}
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static void registerSigHandler()
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{
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struct sigaction sa;
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sigemptyset(&sa.sa_mask);
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sa.sa_flags = 0;
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sa.sa_handler = handleSignal;
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sigaction(SIGHUP, &sa, NULL);
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sigaction(SIGINT, &sa, NULL);
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sigaction(SIGQUIT, &sa, NULL);
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sigaction(SIGTERM, &sa, NULL);
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}
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static bool setCategoryEnable(const char* name, bool enable)
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{
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for (int i = 0; i < NELEM(k_categories); i++) {
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const TracingCategory& c = k_categories[i];
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if (strcmp(name, c.name) == 0) {
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if (isCategorySupported(c)) {
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g_categoryEnables[i] = enable;
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return true;
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} else {
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if (isCategorySupportedForRoot(c)) {
|
|
fprintf(stderr, "error: category \"%s\" requires root "
|
|
"privileges.\n", name);
|
|
} else {
|
|
fprintf(stderr, "error: category \"%s\" is not supported "
|
|
"on this device.\n", name);
|
|
}
|
|
return false;
|
|
}
|
|
}
|
|
}
|
|
fprintf(stderr, "error: unknown tracing category \"%s\"\n", name);
|
|
return false;
|
|
}
|
|
|
|
static void listSupportedCategories()
|
|
{
|
|
for (int i = 0; i < NELEM(k_categories); i++) {
|
|
const TracingCategory& c = k_categories[i];
|
|
if (isCategorySupported(c)) {
|
|
printf(" %10s - %s\n", c.name, c.longname);
|
|
}
|
|
}
|
|
}
|
|
|
|
// Print the command usage help to stderr.
|
|
static void showHelp(const char *cmd)
|
|
{
|
|
fprintf(stderr, "usage: %s [options] [categories...]\n", cmd);
|
|
fprintf(stderr, "options include:\n"
|
|
" -b N use a trace buffer size of N KB\n"
|
|
" -c trace into a circular buffer\n"
|
|
" -n ignore signals\n"
|
|
" -s N sleep for N seconds before tracing [default 0]\n"
|
|
" -t N trace for N seconds [defualt 5]\n"
|
|
" -z compress the trace dump\n"
|
|
" --async_start start circular trace and return immediatly\n"
|
|
" --async_dump dump the current contents of circular trace buffer\n"
|
|
" --async_stop stop tracing and dump the current contents of circular\n"
|
|
" trace buffer\n"
|
|
" --list_categories\n"
|
|
" list the available tracing categories\n"
|
|
);
|
|
}
|
|
|
|
int main(int argc, char **argv)
|
|
{
|
|
bool async = false;
|
|
bool traceStart = true;
|
|
bool traceStop = true;
|
|
bool traceDump = true;
|
|
|
|
if (argc == 2 && 0 == strcmp(argv[1], "--help")) {
|
|
showHelp(argv[0]);
|
|
exit(0);
|
|
}
|
|
|
|
for (;;) {
|
|
int ret;
|
|
int option_index = 0;
|
|
static struct option long_options[] = {
|
|
{"async_start", no_argument, 0, 0 },
|
|
{"async_stop", no_argument, 0, 0 },
|
|
{"async_dump", no_argument, 0, 0 },
|
|
{"list_categories", no_argument, 0, 0 },
|
|
{ 0, 0, 0, 0 }
|
|
};
|
|
|
|
ret = getopt_long(argc, argv, "b:cns:t:z",
|
|
long_options, &option_index);
|
|
|
|
if (ret < 0) {
|
|
for (int i = optind; i < argc; i++) {
|
|
if (!setCategoryEnable(argv[i], true)) {
|
|
fprintf(stderr, "error enabling tracing category \"%s\"\n", argv[i]);
|
|
exit(1);
|
|
}
|
|
}
|
|
break;
|
|
}
|
|
|
|
switch(ret) {
|
|
case 'b':
|
|
g_traceBufferSizeKB = atoi(optarg);
|
|
break;
|
|
|
|
case 'c':
|
|
g_traceOverwrite = true;
|
|
break;
|
|
|
|
case 'n':
|
|
g_nohup = true;
|
|
break;
|
|
|
|
case 's':
|
|
g_initialSleepSecs = atoi(optarg);
|
|
break;
|
|
|
|
case 't':
|
|
g_traceDurationSeconds = atoi(optarg);
|
|
break;
|
|
|
|
case 'z':
|
|
g_compress = true;
|
|
break;
|
|
|
|
case 0:
|
|
if (!strcmp(long_options[option_index].name, "async_start")) {
|
|
async = true;
|
|
traceStop = false;
|
|
traceDump = false;
|
|
g_traceOverwrite = true;
|
|
} else if (!strcmp(long_options[option_index].name, "async_stop")) {
|
|
async = true;
|
|
traceStop = false;
|
|
} else if (!strcmp(long_options[option_index].name, "async_dump")) {
|
|
async = true;
|
|
traceStart = false;
|
|
traceStop = false;
|
|
} else if (!strcmp(long_options[option_index].name, "list_categories")) {
|
|
listSupportedCategories();
|
|
exit(0);
|
|
}
|
|
break;
|
|
|
|
default:
|
|
fprintf(stderr, "\n");
|
|
showHelp(argv[0]);
|
|
exit(-1);
|
|
break;
|
|
}
|
|
}
|
|
|
|
registerSigHandler();
|
|
|
|
if (g_initialSleepSecs > 0) {
|
|
sleep(g_initialSleepSecs);
|
|
}
|
|
|
|
bool ok = startTrace();
|
|
|
|
if (ok && traceStart) {
|
|
printf("capturing trace...");
|
|
fflush(stdout);
|
|
|
|
// We clear the trace after starting it because tracing gets enabled for
|
|
// each CPU individually in the kernel. Having the beginning of the trace
|
|
// contain entries from only one CPU can cause "begin" entries without a
|
|
// matching "end" entry to show up if a task gets migrated from one CPU to
|
|
// another.
|
|
ok = clearTrace();
|
|
|
|
if (ok && !async) {
|
|
// Sleep to allow the trace to be captured.
|
|
struct timespec timeLeft;
|
|
timeLeft.tv_sec = g_traceDurationSeconds;
|
|
timeLeft.tv_nsec = 0;
|
|
do {
|
|
if (g_traceAborted) {
|
|
break;
|
|
}
|
|
} while (nanosleep(&timeLeft, &timeLeft) == -1 && errno == EINTR);
|
|
}
|
|
}
|
|
|
|
// Stop the trace and restore the default settings.
|
|
if (traceStop)
|
|
stopTrace();
|
|
|
|
if (ok && traceDump) {
|
|
if (!g_traceAborted) {
|
|
printf(" done\nTRACE:\n");
|
|
fflush(stdout);
|
|
dumpTrace();
|
|
} else {
|
|
printf("\ntrace aborted.\n");
|
|
fflush(stdout);
|
|
}
|
|
clearTrace();
|
|
} else if (!ok) {
|
|
fprintf(stderr, "unable to start tracing\n");
|
|
}
|
|
|
|
// Reset the trace buffer size to 1.
|
|
if (traceStop)
|
|
setTraceBufferSizeKB(1);
|
|
|
|
return g_traceAborted ? 1 : 0;
|
|
}
|