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
|
/*
* Copyright (c) 2020-2021, Andreas Kling <kling@serenityos.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <AK/JsonArraySerializer.h>
#include <AK/JsonObject.h>
#include <AK/JsonObjectSerializer.h>
#include <Kernel/Arch/x86/SmapDisabler.h>
#include <Kernel/KBufferBuilder.h>
#include <Kernel/PerformanceEventBuffer.h>
#include <Kernel/Process.h>
namespace Kernel {
PerformanceEventBuffer::PerformanceEventBuffer(NonnullOwnPtr<KBuffer> buffer)
: m_buffer(move(buffer))
{
}
KResult PerformanceEventBuffer::append(int type, FlatPtr arg1, FlatPtr arg2)
{
FlatPtr ebp;
asm volatile("movl %%ebp, %%eax"
: "=a"(ebp));
auto current_thread = Thread::current();
auto eip = current_thread->get_register_dump_from_stack().eip;
return append_with_eip_and_ebp(eip, ebp, type, arg1, arg2);
}
static Vector<FlatPtr, PerformanceEvent::max_stack_frame_count> raw_backtrace(FlatPtr ebp, FlatPtr eip)
{
Vector<FlatPtr, PerformanceEvent::max_stack_frame_count> backtrace;
backtrace.append(eip);
FlatPtr stack_ptr_copy;
FlatPtr stack_ptr = (FlatPtr)ebp;
// FIXME: Figure out how to remove this SmapDisabler without breaking profile stacks.
SmapDisabler disabler;
while (stack_ptr) {
void* fault_at;
if (!safe_memcpy(&stack_ptr_copy, (void*)stack_ptr, sizeof(FlatPtr), fault_at))
break;
FlatPtr retaddr;
if (!safe_memcpy(&retaddr, (void*)(stack_ptr + sizeof(FlatPtr)), sizeof(FlatPtr), fault_at))
break;
backtrace.append(retaddr);
if (backtrace.size() == PerformanceEvent::max_stack_frame_count)
break;
stack_ptr = stack_ptr_copy;
}
return backtrace;
}
KResult PerformanceEventBuffer::append_with_eip_and_ebp(u32 eip, u32 ebp, int type, FlatPtr arg1, FlatPtr arg2)
{
if (count() >= capacity())
return ENOBUFS;
PerformanceEvent event;
event.type = type;
switch (type) {
case PERF_EVENT_SAMPLE:
break;
case PERF_EVENT_MALLOC:
event.data.malloc.size = arg1;
event.data.malloc.ptr = arg2;
break;
case PERF_EVENT_FREE:
event.data.free.ptr = arg1;
break;
default:
return EINVAL;
}
auto backtrace = raw_backtrace(ebp, eip);
event.stack_size = min(sizeof(event.stack) / sizeof(FlatPtr), static_cast<size_t>(backtrace.size()));
memcpy(event.stack, backtrace.data(), event.stack_size * sizeof(FlatPtr));
event.timestamp = TimeManagement::the().uptime_ms();
at(m_count++) = event;
return KSuccess;
}
PerformanceEvent& PerformanceEventBuffer::at(size_t index)
{
VERIFY(index < capacity());
auto* events = reinterpret_cast<PerformanceEvent*>(m_buffer->data());
return events[index];
}
OwnPtr<KBuffer> PerformanceEventBuffer::to_json(ProcessID pid, const String& executable_path) const
{
KBufferBuilder builder;
if (!to_json(builder, pid, executable_path))
return {};
return builder.build();
}
bool PerformanceEventBuffer::to_json(KBufferBuilder& builder, ProcessID pid, const String& executable_path) const
{
auto process = Process::from_pid(pid);
VERIFY(process);
ScopedSpinLock locker(process->space().get_lock());
JsonObjectSerializer object(builder);
object.add("pid", pid.value());
object.add("executable", executable_path);
{
auto region_array = object.add_array("regions");
for (const auto& region : process->space().regions()) {
auto region_object = region_array.add_object();
region_object.add("base", region.vaddr().get());
region_object.add("size", region.size());
region_object.add("name", region.name());
}
region_array.finish();
}
auto array = object.add_array("events");
for (size_t i = 0; i < m_count; ++i) {
auto& event = at(i);
auto event_object = array.add_object();
switch (event.type) {
case PERF_EVENT_SAMPLE:
event_object.add("type", "sample");
break;
case PERF_EVENT_MALLOC:
event_object.add("type", "malloc");
event_object.add("ptr", static_cast<u64>(event.data.malloc.ptr));
event_object.add("size", static_cast<u64>(event.data.malloc.size));
break;
case PERF_EVENT_FREE:
event_object.add("type", "free");
event_object.add("ptr", static_cast<u64>(event.data.free.ptr));
break;
}
event_object.add("tid", event.tid);
event_object.add("timestamp", event.timestamp);
auto stack_array = event_object.add_array("stack");
for (size_t j = 0; j < event.stack_size; ++j) {
stack_array.add(event.stack[j]);
}
stack_array.finish();
event_object.finish();
}
array.finish();
object.finish();
return true;
}
OwnPtr<PerformanceEventBuffer> PerformanceEventBuffer::try_create_with_size(size_t buffer_size)
{
auto buffer = KBuffer::try_create_with_size(buffer_size, Region::Access::Read | Region::Access::Write, "Performance events", AllocationStrategy::AllocateNow);
if (!buffer)
return {};
return adopt_own(*new PerformanceEventBuffer(buffer.release_nonnull()));
}
}
|
