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
|
// Copyright 2015 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "components/metrics/call_stack_profile_metrics_provider.h"
#include <cstring>
#include <map>
#include <utility>
#include "base/bind.h"
#include "base/logging.h"
#include "base/macros.h"
#include "base/message_loop/message_loop_proxy.h"
#include "base/metrics/field_trial.h"
#include "base/profiler/stack_sampling_profiler.h"
#include "components/metrics/metrics_hashes.h"
#include "components/metrics/proto/chrome_user_metrics_extension.pb.h"
using base::StackSamplingProfiler;
namespace metrics {
namespace {
// Accepts and ignores the completed profiles. Used when metrics reporting is
// disabled.
void IgnoreCompletedProfiles(
const StackSamplingProfiler::CallStackProfiles& profiles) {
}
// The protobuf expects the MD5 checksum prefix of the module name.
uint64 HashModuleFilename(const base::FilePath& filename) {
const base::FilePath::StringType basename = filename.BaseName().value();
// Copy the bytes in basename into a string buffer.
size_t basename_length_in_bytes =
basename.size() * sizeof(base::FilePath::CharType);
std::string name_bytes(basename_length_in_bytes, '\0');
memcpy(&name_bytes[0], &basename[0], basename_length_in_bytes);
return HashMetricName(name_bytes);
}
// Transcode |sample| into |proto_sample|, using base addresses in |modules| to
// compute module instruction pointer offsets.
void CopySampleToProto(
const StackSamplingProfiler::Sample& sample,
const std::vector<StackSamplingProfiler::Module>& modules,
CallStackProfile::Sample* proto_sample) {
for (const StackSamplingProfiler::Frame& frame : sample) {
CallStackProfile::Entry* entry = proto_sample->add_entry();
// A frame may not have a valid module. If so, we can't compute the
// instruction pointer offset, and we don't want to send bare pointers, so
// leave call_stack_entry empty.
if (frame.module_index == StackSamplingProfiler::Frame::kUnknownModuleIndex)
continue;
int64 module_offset =
reinterpret_cast<const char*>(frame.instruction_pointer) -
reinterpret_cast<const char*>(modules[frame.module_index].base_address);
DCHECK_GE(module_offset, 0);
entry->set_address(static_cast<uint64>(module_offset));
entry->set_module_id_index(frame.module_index);
}
}
// Transcode |profile| into |proto_profile|.
void CopyProfileToProto(
const StackSamplingProfiler::CallStackProfile& profile,
CallStackProfile* proto_profile) {
if (profile.samples.empty())
return;
if (profile.preserve_sample_ordering) {
// Collapse only consecutive repeated samples together.
CallStackProfile::Sample* current_sample_proto = nullptr;
for (auto it = profile.samples.begin(); it != profile.samples.end(); ++it) {
if (!current_sample_proto || *it != *(it - 1)) {
current_sample_proto = proto_profile->add_sample();
CopySampleToProto(*it, profile.modules, current_sample_proto);
current_sample_proto->set_count(1);
} else {
current_sample_proto->set_count(current_sample_proto->count() + 1);
}
}
} else {
// Collapse all repeated samples together.
std::map<StackSamplingProfiler::Sample, int> sample_index;
for (auto it = profile.samples.begin(); it != profile.samples.end(); ++it) {
auto location = sample_index.find(*it);
if (location == sample_index.end()) {
CallStackProfile::Sample* sample_proto = proto_profile->add_sample();
CopySampleToProto(*it, profile.modules, sample_proto);
sample_proto->set_count(1);
sample_index.insert(
std::make_pair(
*it, static_cast<int>(proto_profile->sample().size()) - 1));
} else {
CallStackProfile::Sample* sample_proto =
proto_profile->mutable_sample()->Mutable(location->second);
sample_proto->set_count(sample_proto->count() + 1);
}
}
}
for (const StackSamplingProfiler::Module& module : profile.modules) {
CallStackProfile::ModuleIdentifier* module_id =
proto_profile->add_module_id();
module_id->set_build_id(module.id);
module_id->set_name_md5_prefix(HashModuleFilename(module.filename));
}
proto_profile->set_profile_duration_ms(
profile.profile_duration.InMilliseconds());
proto_profile->set_sampling_period_ms(
profile.sampling_period.InMilliseconds());
}
// Translates CallStackProfileMetricsProvider's trigger to the corresponding
// SampledProfile TriggerEvent.
SampledProfile::TriggerEvent ToSampledProfileTriggerEvent(
CallStackProfileMetricsProvider::Trigger trigger) {
switch (trigger) {
case CallStackProfileMetricsProvider::UNKNOWN:
return SampledProfile::UNKNOWN_TRIGGER_EVENT;
break;
case CallStackProfileMetricsProvider::PROCESS_STARTUP:
return SampledProfile::PROCESS_STARTUP;
break;
case CallStackProfileMetricsProvider::JANKY_TASK:
return SampledProfile::JANKY_TASK;
break;
case CallStackProfileMetricsProvider::THREAD_HUNG:
return SampledProfile::THREAD_HUNG;
break;
}
NOTREACHED();
return SampledProfile::UNKNOWN_TRIGGER_EVENT;
}
} // namespace
const char CallStackProfileMetricsProvider::kFieldTrialName[] =
"StackProfiling";
const char CallStackProfileMetricsProvider::kReportProfilesGroupName[] =
"Report profiles";
CallStackProfileMetricsProvider::CallStackProfileMetricsProvider()
: weak_factory_(this) {
}
CallStackProfileMetricsProvider::~CallStackProfileMetricsProvider() {
StackSamplingProfiler::SetDefaultCompletedCallback(
StackSamplingProfiler::CompletedCallback());
}
void CallStackProfileMetricsProvider::OnRecordingEnabled() {
StackSamplingProfiler::SetDefaultCompletedCallback(
base::Bind(&CallStackProfileMetricsProvider::ReceiveCompletedProfiles,
base::MessageLoopProxy::current(),
weak_factory_.GetWeakPtr()));
}
void CallStackProfileMetricsProvider::OnRecordingDisabled() {
StackSamplingProfiler::SetDefaultCompletedCallback(
base::Bind(&IgnoreCompletedProfiles));
pending_profiles_.clear();
}
void CallStackProfileMetricsProvider::ProvideGeneralMetrics(
ChromeUserMetricsExtension* uma_proto) {
DCHECK(IsSamplingProfilingReportingEnabled() || pending_profiles_.empty());
for (const StackSamplingProfiler::CallStackProfile& profile :
pending_profiles_) {
SampledProfile* sampled_profile = uma_proto->add_sampled_profile();
sampled_profile->set_trigger_event(ToSampledProfileTriggerEvent(
static_cast<CallStackProfileMetricsProvider::Trigger>(
profile.user_data)));
CopyProfileToProto(profile, sampled_profile->mutable_call_stack_profile());
}
pending_profiles_.clear();
}
void CallStackProfileMetricsProvider::AppendSourceProfilesForTesting(
const std::vector<StackSamplingProfiler::CallStackProfile>& profiles) {
AppendCompletedProfiles(profiles);
}
// static
bool CallStackProfileMetricsProvider::IsSamplingProfilingReportingEnabled() {
const std::string group_name = base::FieldTrialList::FindFullName(
CallStackProfileMetricsProvider::kFieldTrialName);
return group_name ==
CallStackProfileMetricsProvider::kReportProfilesGroupName;
}
// static
// Posts a message back to our own thread to collect the profiles.
void CallStackProfileMetricsProvider::ReceiveCompletedProfiles(
scoped_refptr<base::MessageLoopProxy> message_loop,
base::WeakPtr<CallStackProfileMetricsProvider> provider,
const StackSamplingProfiler::CallStackProfiles& profiles) {
message_loop->PostTask(
FROM_HERE,
base::Bind(&CallStackProfileMetricsProvider::AppendCompletedProfiles,
provider, profiles));
}
void CallStackProfileMetricsProvider::AppendCompletedProfiles(
const StackSamplingProfiler::CallStackProfiles& profiles) {
// Don't bother to record profiles if reporting is not enabled.
if (IsSamplingProfilingReportingEnabled()) {
pending_profiles_.insert(pending_profiles_.end(), profiles.begin(),
profiles.end());
}
}
} // namespace metrics
|
