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
|
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* 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 "mozilla/AvailableMemoryTracker.h"
#if defined(XP_WIN)
# include "mozilla/WindowsVersion.h"
# include "nsIMemoryReporter.h"
#endif
#include "nsIObserver.h"
#include "nsIObserverService.h"
#include "nsIRunnable.h"
#include "nsISupports.h"
#include "nsThreadUtils.h"
#include "nsXULAppAPI.h"
#include "mozilla/Mutex.h"
#include "mozilla/ResultExtensions.h"
#include "mozilla/Services.h"
#if defined(MOZ_MEMORY)
# include "mozmemory.h"
#endif // MOZ_MEMORY
using namespace mozilla;
Atomic<uint32_t, MemoryOrdering::Relaxed> sNumLowPhysicalMemEvents;
namespace {
#if defined(XP_WIN)
# if (NTDDI_VERSION < NTDDI_WINBLUE) || \
(NTDDI_VERSION == NTDDI_WINBLUE && !defined(WINBLUE_KBSPRING14))
// Definitions for heap optimization that require the Windows SDK to target the
// Windows 8.1 Update
static const HEAP_INFORMATION_CLASS HeapOptimizeResources =
static_cast<HEAP_INFORMATION_CLASS>(3);
static const DWORD HEAP_OPTIMIZE_RESOURCES_CURRENT_VERSION = 1;
typedef struct _HEAP_OPTIMIZE_RESOURCES_INFORMATION {
DWORD Version;
DWORD Flags;
} HEAP_OPTIMIZE_RESOURCES_INFORMATION, *PHEAP_OPTIMIZE_RESOURCES_INFORMATION;
# endif
static int64_t LowMemoryEventsPhysicalDistinguishedAmount() {
return sNumLowPhysicalMemEvents;
}
class LowEventsReporter final : public nsIMemoryReporter {
~LowEventsReporter() {}
public:
NS_DECL_ISUPPORTS
NS_IMETHOD CollectReports(nsIHandleReportCallback* aHandleReport,
nsISupports* aData, bool aAnonymize) override {
// clang-format off
MOZ_COLLECT_REPORT(
"low-memory-events/physical", KIND_OTHER, UNITS_COUNT_CUMULATIVE,
LowMemoryEventsPhysicalDistinguishedAmount(),
"Number of low-physical-memory events fired since startup. We fire such an "
"event when a windows low memory resource notification is signaled. The "
"machine will start to page if it runs out of physical memory. This may "
"cause it to run slowly, but it shouldn't cause it to crash.");
// clang-format on
return NS_OK;
}
};
NS_IMPL_ISUPPORTS(LowEventsReporter, nsIMemoryReporter)
#endif // defined(XP_WIN)
/**
* This runnable is executed in response to a memory-pressure event; we spin
* the event-loop when receiving the memory-pressure event in the hope that
* other observers will synchronously free some memory that we'll be able to
* purge here.
*/
class nsJemallocFreeDirtyPagesRunnable final : public Runnable {
~nsJemallocFreeDirtyPagesRunnable() = default;
#if defined(XP_WIN)
void OptimizeSystemHeap();
#endif
public:
NS_DECL_NSIRUNNABLE
nsJemallocFreeDirtyPagesRunnable()
: Runnable("nsJemallocFreeDirtyPagesRunnable") {}
};
NS_IMETHODIMP
nsJemallocFreeDirtyPagesRunnable::Run() {
MOZ_ASSERT(NS_IsMainThread());
#if defined(MOZ_MEMORY)
jemalloc_free_dirty_pages();
#endif
#if defined(XP_WIN)
OptimizeSystemHeap();
#endif
return NS_OK;
}
#if defined(XP_WIN)
void nsJemallocFreeDirtyPagesRunnable::OptimizeSystemHeap() {
// HeapSetInformation exists prior to Windows 8.1, but the
// HeapOptimizeResources information class does not.
if (IsWin8Point1OrLater()) {
HEAP_OPTIMIZE_RESOURCES_INFORMATION heapOptInfo = {
HEAP_OPTIMIZE_RESOURCES_CURRENT_VERSION};
::HeapSetInformation(nullptr, HeapOptimizeResources, &heapOptInfo,
sizeof(heapOptInfo));
}
}
#endif // defined(XP_WIN)
/**
* The memory pressure watcher is used for listening to memory-pressure events
* and reacting upon them. We use one instance per process currently only for
* cleaning up dirty unused pages held by jemalloc.
*/
class nsMemoryPressureWatcher final : public nsIObserver {
~nsMemoryPressureWatcher() = default;
public:
NS_DECL_ISUPPORTS
NS_DECL_NSIOBSERVER
void Init();
};
NS_IMPL_ISUPPORTS(nsMemoryPressureWatcher, nsIObserver)
/**
* Initialize and subscribe to the memory-pressure events. We subscribe to the
* observer service in this method and not in the constructor because we need
* to hold a strong reference to 'this' before calling the observer service.
*/
void nsMemoryPressureWatcher::Init() {
nsCOMPtr<nsIObserverService> os = services::GetObserverService();
if (os) {
os->AddObserver(this, "memory-pressure", /* ownsWeak */ false);
}
}
/**
* Reacts to all types of memory-pressure events, launches a runnable to
* free dirty pages held by jemalloc.
*/
NS_IMETHODIMP
nsMemoryPressureWatcher::Observe(nsISupports* aSubject, const char* aTopic,
const char16_t* aData) {
MOZ_ASSERT(!strcmp(aTopic, "memory-pressure"), "Unknown topic");
nsCOMPtr<nsIRunnable> runnable = new nsJemallocFreeDirtyPagesRunnable();
NS_DispatchToMainThread(runnable);
return NS_OK;
}
} // namespace
namespace mozilla {
namespace AvailableMemoryTracker {
void Init() {
// The watchers are held alive by the observer service.
RefPtr<nsMemoryPressureWatcher> watcher = new nsMemoryPressureWatcher();
watcher->Init();
#if defined(XP_WIN)
RegisterLowMemoryEventsPhysicalDistinguishedAmount(
LowMemoryEventsPhysicalDistinguishedAmount);
#endif // defined(XP_WIN)
}
} // namespace AvailableMemoryTracker
} // namespace mozilla
|
