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
228
229
230
231
232
233
234
235
|
// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#include "cgroup_resource_limits.h"
#include "round_up_to_page_size.h"
#include <algorithm>
#include <cmath>
#include <filesystem>
#include <fstream>
#include <limits>
#include <sstream>
namespace vespalib {
namespace {
std::string
combine_paths(const std::string& base_path, const std::string& controller, const std::string &cgroup_path)
{
std::ostringstream os;
os << base_path;
if (!controller.empty()) {
os << "/" << controller;
}
if (!cgroup_path.empty() && cgroup_path != "/") {
if (cgroup_path[0] != '/') {
os << "/";
}
os << cgroup_path;
}
return os.str();
}
const std::string empty_std_string;
}
CGroupResourceLimits::CGroupResourceLimits()
: CGroupResourceLimits("/sys/fs/cgroup", "/proc/self/cgroup")
{
}
CGroupResourceLimits::CGroupResourceLimits(const std::string& base_path, const std::string& map_path)
: _memory_limit(),
_cpu_limit(),
_base_path(base_path),
_map_path(map_path),
_cgroup_v2_path(),
_cgroup_v1_paths()
{
get_cgroup_paths();
if (!_cgroup_v1_paths.empty()) {
get_limits_v1();
} else {
get_limits_v2();
}
}
CGroupResourceLimits::~CGroupResourceLimits() = default;
void
CGroupResourceLimits::apply_memory_limit(uint64_t memory_limit)
{
if (!_memory_limit.has_value() || _memory_limit.value() > memory_limit) {
_memory_limit = memory_limit;
}
}
void
CGroupResourceLimits::apply_cpu_limit(uint32_t cpu_limit)
{
if (!_cpu_limit.has_value() || _cpu_limit.value() > cpu_limit) {
_cpu_limit = cpu_limit;
}
}
void
CGroupResourceLimits::get_cgroup_paths()
{
/*
* See manual page for cgroups(7) on linux for format of /proc/[pid]/cgroup.
*/
std::ifstream cg_self(_map_path);
std::string line;
while (std::getline(cg_self, line)) {
if (line.size() >= 3 && line.substr(0, 3) == "0::") {
_cgroup_v2_path = line.substr(3);
continue;
}
auto col_pos = line.find(':');
if (col_pos != std::string::npos) {
auto name_pos = col_pos + 1;
col_pos = line.find(':', name_pos);
if (col_pos != std::string::npos) {
auto cg_path = line.substr(col_pos + 1);
auto comma_pos = line.find(',', name_pos);
while (comma_pos < col_pos) {
auto subsystem = line.substr(name_pos, comma_pos - name_pos);
_cgroup_v1_paths[subsystem] = cg_path;
name_pos = comma_pos + 1;
comma_pos = line.find(',', name_pos);
}
auto subsystem = line.substr(name_pos, col_pos - name_pos);
_cgroup_v1_paths[subsystem] = cg_path;
}
}
}
}
void
CGroupResourceLimits::foreach_cgroup_level(const std::string& controller, const std::string& cgroup_path, const std::function<void(const std::string&)>& callback)
{
auto dir = combine_paths(_base_path, controller, empty_std_string);
if (!std::filesystem::is_directory(std::filesystem::path(dir))) {
return;
}
callback(dir);
if (cgroup_path.empty() || cgroup_path == "/") {
return;
}
auto slash_pos = cgroup_path.find('/', 1);
while (slash_pos != std::string::npos) {
dir = combine_paths(_base_path, controller, cgroup_path.substr(0, slash_pos));
if (!std::filesystem::is_directory(std::filesystem::path(dir))) {
return;
}
callback(dir);
slash_pos = cgroup_path.find('/', slash_pos + 1);
}
dir = combine_paths(_base_path, controller, cgroup_path);
if (std::filesystem::is_directory(std::filesystem::path(dir))) {
callback(dir);
}
}
void
CGroupResourceLimits::foreach_cgroup_v1_level(const std::string& controller, const std::function<void(const std::string&)>& callback)
{
auto itr = _cgroup_v1_paths.find(controller);
if (itr != _cgroup_v1_paths.end()) {
foreach_cgroup_level(controller, itr->second, callback);
} else {
foreach_cgroup_level(controller, empty_std_string, callback);
}
}
void
CGroupResourceLimits::foreach_cgroup_v2_level(const std::function<void(const std::string&)>& callback)
{
foreach_cgroup_level(empty_std_string, _cgroup_v2_path, callback);
}
void
CGroupResourceLimits::get_memory_limits_v1(const std::string& dir)
{
std::ifstream limitfile(dir + "/memory.limit_in_bytes");
uint64_t memory_limit = std::numeric_limits<uint64_t>::max();
limitfile >> memory_limit;
if (limitfile.good() && (memory_limit < std::numeric_limits<int64_t>::max() - (round_up_to_page_size(1) - 1))) {
apply_memory_limit(memory_limit);
}
}
void
CGroupResourceLimits::get_memory_limits_v1()
{
foreach_cgroup_v1_level("memory", [this](const std::string& dir) { get_memory_limits_v1(dir); });
}
void
CGroupResourceLimits::get_cpu_limits_v1(const std::string& dir)
{
int32_t cpu_cfs_period_us = 0;
int32_t cpu_cfs_quota_us = 0;
std::ifstream period_file(dir + "/cpu.cfs_period_us");
std::ifstream quota_file(dir + "/cpu.cfs_quota_us");
period_file >> cpu_cfs_period_us;
quota_file >> cpu_cfs_quota_us;
if (quota_file.good() && period_file.good() && cpu_cfs_quota_us >= 0 && cpu_cfs_period_us > 0) {
auto cpu = std::max(1.0, std::ceil(static_cast<double>(cpu_cfs_quota_us) / cpu_cfs_period_us));
apply_cpu_limit(cpu);
}
}
void
CGroupResourceLimits::get_cpu_limits_v1()
{
foreach_cgroup_v1_level("cpu", [this](const std::string& dir) { get_cpu_limits_v1(dir); });
}
void
CGroupResourceLimits::get_limits_v1()
{
get_memory_limits_v1();
get_cpu_limits_v1();
}
void
CGroupResourceLimits::get_memory_limits_v2(const std::string& dir)
{
std::ifstream limitfile(dir + "/memory.max");
uint64_t memory_limit = std::numeric_limits<uint64_t>::max();
limitfile >> memory_limit;
if (limitfile.good()) {
apply_memory_limit(memory_limit);
}
}
void
CGroupResourceLimits::get_cpu_limits_v2(const std::string& dir)
{
int32_t cpu_cfs_period_us = 0;
int32_t cpu_cfs_quota_us = 0;
std::ifstream cpu_max_file(dir + "/cpu.max");
cpu_max_file >> cpu_cfs_quota_us >> cpu_cfs_period_us;
if (cpu_max_file.good() && cpu_cfs_quota_us >= 0 && cpu_cfs_period_us > 0) {
auto cpu = std::max(1.0, std::ceil(static_cast<double>(cpu_cfs_quota_us) / cpu_cfs_period_us));
apply_cpu_limit(cpu);
}
}
void
CGroupResourceLimits::get_limits_v2(const std::string& dir)
{
get_memory_limits_v2(dir);
get_cpu_limits_v2(dir);
}
void
CGroupResourceLimits::get_limits_v2()
{
foreach_cgroup_v2_level([this](const std::string& dir) { get_limits_v2(dir); });
}
}
|
