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| Original file line number | Diff line number | Diff line change |
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| @@ -1,20 +1,28 @@ | ||
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| ### CI modificators (add a leading space to apply): | ||
| ### CI modificators (add a leading space to apply) ### | ||
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| ## To avoid a merge commit in CI: | ||
| #no_merge_commit | ||
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| ## To discard CI cache: | ||
| #no_ci_cache | ||
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| ## To not test (only style check): | ||
| #do_not_test | ||
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| ## To run specified set of tests in CI: | ||
| #ci_set_<SET_NAME> | ||
| #ci_set_reduced | ||
| #ci_set_arm | ||
| #ci_set_integration | ||
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| ## To run specified job in CI: | ||
| #job_<JOB NAME> | ||
| #job_stateless_tests_release | ||
| #job_package_debug | ||
| #job_integration_tests_asan | ||
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| ## To run only specified batches for multi-batch job(s) | ||
| #batch_2 | ||
| #btach_1_2_3 |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,64 @@ | ||
| #include <base/cgroupsv2.h> | ||
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| #include <base/defines.h> | ||
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| #include <fstream> | ||
| #include <sstream> | ||
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| bool cgroupsV2Enabled() | ||
| { | ||
| #if defined(OS_LINUX) | ||
| /// This file exists iff the host has cgroups v2 enabled. | ||
| auto controllers_file = default_cgroups_mount / "cgroup.controllers"; | ||
| if (!std::filesystem::exists(controllers_file)) | ||
| return false; | ||
| return true; | ||
| #else | ||
| return false; | ||
| #endif | ||
| } | ||
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| bool cgroupsV2MemoryControllerEnabled() | ||
| { | ||
| #if defined(OS_LINUX) | ||
| chassert(cgroupsV2Enabled()); | ||
| /// According to https://docs.kernel.org/admin-guide/cgroup-v2.html: | ||
| /// - file 'cgroup.controllers' defines which controllers *can* be enabled | ||
| /// - file 'cgroup.subtree_control' defines which controllers *are* enabled | ||
| /// Caveat: nested groups may disable controllers. For simplicity, check only the top-level group. | ||
| std::ifstream subtree_control_file(default_cgroups_mount / "cgroup.subtree_control"); | ||
| if (!subtree_control_file.is_open()) | ||
| return false; | ||
| std::string controllers; | ||
| std::getline(subtree_control_file, controllers); | ||
| if (controllers.find("memory") == std::string::npos) | ||
| return false; | ||
| return true; | ||
| #else | ||
| return false; | ||
| #endif | ||
| } | ||
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| std::string cgroupV2OfProcess() | ||
| { | ||
| #if defined(OS_LINUX) | ||
| chassert(cgroupsV2Enabled()); | ||
| /// All PIDs assigned to a cgroup are in /sys/fs/cgroups/{cgroup_name}/cgroup.procs | ||
| /// A simpler way to get the membership is: | ||
| std::ifstream cgroup_name_file("/proc/self/cgroup"); | ||
| if (!cgroup_name_file.is_open()) | ||
| return ""; | ||
| /// With cgroups v2, there will be a *single* line with prefix "0::/" | ||
| /// (see https://docs.kernel.org/admin-guide/cgroup-v2.html) | ||
| std::string cgroup; | ||
| std::getline(cgroup_name_file, cgroup); | ||
| static const std::string v2_prefix = "0::/"; | ||
| if (!cgroup.starts_with(v2_prefix)) | ||
| return ""; | ||
| cgroup = cgroup.substr(v2_prefix.length()); | ||
| return cgroup; | ||
| #else | ||
| return ""; | ||
| #endif | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,22 @@ | ||
| #pragma once | ||
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| #include <filesystem> | ||
| #include <string> | ||
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| #if defined(OS_LINUX) | ||
| /// I think it is possible to mount the cgroups hierarchy somewhere else (e.g. when in containers). | ||
| /// /sys/fs/cgroup was still symlinked to the actual mount in the cases that I have seen. | ||
| static inline const std::filesystem::path default_cgroups_mount = "/sys/fs/cgroup"; | ||
| #endif | ||
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| /// Is cgroups v2 enabled on the system? | ||
| bool cgroupsV2Enabled(); | ||
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| /// Is the memory controller of cgroups v2 enabled on the system? | ||
| /// Assumes that cgroupsV2Enabled() is enabled. | ||
| bool cgroupsV2MemoryControllerEnabled(); | ||
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| /// Which cgroup does the process belong to? | ||
| /// Returns an empty string if the cgroup cannot be determined. | ||
| /// Assumes that cgroupsV2Enabled() is enabled. | ||
| std::string cgroupV2OfProcess(); |
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