1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
|
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "MainThreadIOLogger.h"
#include "GeckoProfiler.h"
#include "IOInterposerPrivate.h"
#include "mozilla/IOInterposer.h"
#include "mozilla/StaticPtr.h"
#include "mozilla/TimeStamp.h"
#include "nsAutoPtr.h"
#include "nsNativeCharsetUtils.h"
#include "nsString.h"
/**
* This code uses NSPR stuff and STL containers because it must be detached
* from leak checking code; this observer runs until the process terminates.
*/
#include <prenv.h>
#include <prprf.h>
#include <prthread.h>
#include <vector>
using namespace mozilla;
namespace {
struct ObservationWithStack
{
ObservationWithStack(mozilla::IOInterposeObserver::Observation& aObs,
ProfilerBacktrace* aStack)
: mObservation(aObs)
, mStack(aStack)
{
const char16_t* filename = aObs.Filename();
if (filename) {
mFilename = filename;
}
}
mozilla::IOInterposeObserver::Observation mObservation;
ProfilerBacktrace* mStack;
nsString mFilename;
};
class MainThreadIOLoggerImpl final : public mozilla::IOInterposeObserver
{
public:
MainThreadIOLoggerImpl();
~MainThreadIOLoggerImpl();
bool Init();
void Observe(Observation& aObservation);
private:
static void sIOThreadFunc(void* aArg);
void IOThreadFunc();
TimeStamp mLogStartTime;
const char* mFileName;
PRThread* mIOThread;
IOInterposer::Monitor mMonitor;
bool mShutdownRequired;
std::vector<ObservationWithStack> mObservations;
};
static StaticAutoPtr<MainThreadIOLoggerImpl> sImpl;
MainThreadIOLoggerImpl::MainThreadIOLoggerImpl()
: mFileName(nullptr)
, mIOThread(nullptr)
, mShutdownRequired(false)
{
}
MainThreadIOLoggerImpl::~MainThreadIOLoggerImpl()
{
if (!mIOThread) {
return;
}
{
// Scope for lock
IOInterposer::MonitorAutoLock lock(mMonitor);
mShutdownRequired = true;
lock.Notify();
}
PR_JoinThread(mIOThread);
mIOThread = nullptr;
}
bool
MainThreadIOLoggerImpl::Init()
{
if (mFileName) {
// Already initialized
return true;
}
mFileName = PR_GetEnv("MOZ_MAIN_THREAD_IO_LOG");
if (!mFileName) {
// Can't start
return false;
}
mIOThread = PR_CreateThread(PR_USER_THREAD, &sIOThreadFunc, this,
PR_PRIORITY_LOW, PR_GLOBAL_THREAD,
PR_JOINABLE_THREAD, 0);
if (!mIOThread) {
return false;
}
return true;
}
/* static */ void
MainThreadIOLoggerImpl::sIOThreadFunc(void* aArg)
{
PR_SetCurrentThreadName("MainThreadIOLogger");
MainThreadIOLoggerImpl* obj = static_cast<MainThreadIOLoggerImpl*>(aArg);
obj->IOThreadFunc();
}
void
MainThreadIOLoggerImpl::IOThreadFunc()
{
PRFileDesc* fd = PR_Open(mFileName, PR_WRONLY | PR_CREATE_FILE | PR_TRUNCATE,
PR_IRUSR | PR_IWUSR | PR_IRGRP);
if (!fd) {
IOInterposer::MonitorAutoLock lock(mMonitor);
mShutdownRequired = true;
std::vector<ObservationWithStack>().swap(mObservations);
return;
}
mLogStartTime = TimeStamp::Now();
{
// Scope for lock
IOInterposer::MonitorAutoLock lock(mMonitor);
while (true) {
while (!mShutdownRequired && mObservations.empty()) {
lock.Wait();
}
if (mShutdownRequired) {
break;
}
// Pull events off the shared array onto a local one
std::vector<ObservationWithStack> observationsToWrite;
observationsToWrite.swap(mObservations);
// Release the lock so that we're not holding anybody up during I/O
IOInterposer::MonitorAutoUnlock unlock(mMonitor);
// Now write the events.
for (auto i = observationsToWrite.begin(), e = observationsToWrite.end();
i != e; ++i) {
if (i->mObservation.ObservedOperation() == OpNextStage) {
PR_fprintf(fd, "%f,NEXT-STAGE\n",
(TimeStamp::Now() - mLogStartTime).ToMilliseconds());
continue;
}
double durationMs = i->mObservation.Duration().ToMilliseconds();
nsAutoCString nativeFilename;
nativeFilename.AssignLiteral("(not available)");
if (!i->mFilename.IsEmpty()) {
if (NS_FAILED(NS_CopyUnicodeToNative(i->mFilename, nativeFilename))) {
nativeFilename.AssignLiteral("(conversion failed)");
}
}
/**
* Format:
* Start Timestamp (Milliseconds), Operation, Duration (Milliseconds), Event Source, Filename
*/
if (PR_fprintf(fd, "%f,%s,%f,%s,%s\n",
(i->mObservation.Start() - mLogStartTime).ToMilliseconds(),
i->mObservation.ObservedOperationString(), durationMs,
i->mObservation.Reference(), nativeFilename.get()) > 0) {
ProfilerBacktrace* stack = i->mStack;
if (stack) {
// TODO: Write out the callstack
// (This will be added in a later bug)
profiler_free_backtrace(stack);
}
}
}
}
}
PR_Close(fd);
}
void
MainThreadIOLoggerImpl::Observe(Observation& aObservation)
{
if (!mFileName || !IsMainThread()) {
return;
}
IOInterposer::MonitorAutoLock lock(mMonitor);
if (mShutdownRequired) {
// The writer thread isn't running. Don't enqueue any more data.
return;
}
// Passing nullptr as aStack parameter for now
mObservations.push_back(ObservationWithStack(aObservation, nullptr));
lock.Notify();
}
} // namespace
namespace mozilla {
namespace MainThreadIOLogger {
bool
Init()
{
nsAutoPtr<MainThreadIOLoggerImpl> impl(new MainThreadIOLoggerImpl());
if (!impl->Init()) {
return false;
}
sImpl = impl.forget();
IOInterposer::Register(IOInterposeObserver::OpAllWithStaging, sImpl);
return true;
}
} // namespace MainThreadIOLogger
} // namespace mozilla
|
