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
|
// Copyright 2023 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "content/browser/metrics/histogram_shared_memory_config.h"
#include "content/public/common/process_type.h"
namespace content {
namespace {
using Config = base::HistogramSharedMemory::Config;
}
std::optional<Config> GetHistogramSharedMemoryConfig(int process_type) {
// Memory size constants used in the configurations.
constexpr size_t k2MB = 2 << 20;
constexpr size_t k512KB = 512 << 10;
constexpr size_t k256KB = 256 << 10;
constexpr size_t k64KB = 64 << 10;
// Determine the correct parameters based on the process type.
switch (process_type) {
case PROCESS_TYPE_RENDERER:
// Create persistent/shared memory and allow histograms to be stored in
// it. Memory that is not actually used won't be physically mapped by the
// system. RendererMetrics usage, as reported in UMA, peaked around 0.7MiB
// as of 2016-12-20.
return Config{PROCESS_TYPE_RENDERER, "RendererMetrics", k2MB};
case PROCESS_TYPE_UTILITY:
return Config{PROCESS_TYPE_UTILITY, "UtilityMetrics", k512KB};
case PROCESS_TYPE_ZYGOTE:
return Config{PROCESS_TYPE_ZYGOTE, "ZygoteMetrics", k64KB};
case PROCESS_TYPE_SANDBOX_HELPER:
return Config{PROCESS_TYPE_SANDBOX_HELPER, "SandboxHelperMetrics", k64KB};
case PROCESS_TYPE_GPU:
return Config{PROCESS_TYPE_GPU, "GpuMetrics", k256KB};
default:
return std::nullopt;
}
}
} // namespace content
|
