3bf67668b6
This is necessary where in certain environments where cgroup is used to limit memory usage of a container or a particular process. GetStats() is used by caching module to figure out the optimal cacheable size in memory with cgroup limits what sysinfo reports might not be the right value set for a given process. Fixes #4001
141 lines
3.1 KiB
Go
141 lines
3.1 KiB
Go
// +build linux
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/*
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* Minio Cloud Storage, (C) 2017 Minio, Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package cgroup
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import (
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"io/ioutil"
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"os"
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"testing"
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)
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// Testing parsing correctness for various process cgroup files.
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func TestProcCGroup(t *testing.T) {
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tmpPath, err := ioutil.TempFile("", "cgroup")
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if err != nil {
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t.Fatal(err)
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}
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defer os.Remove(tmpPath.Name())
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cgroup := `
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11:memory:/user.slice
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10:blkio:/user.slice
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9:hugetlb:/
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8:net_cls,net_prio:/
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7:perf_event:/
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6:pids:/user.slice/user-1000.slice
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5:devices:/user.slice
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4:cpuset:/
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3:cpu,cpuacct:/user.slice
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2:freezer:/
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1:name=systemd:/user.slice/user-1000.slice/session-1.scope
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`
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_, err = tmpPath.WriteString(cgroup)
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if err != nil {
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t.Fatal(err)
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}
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// Seek back to read from the beginning.
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tmpPath.Seek(0, 0)
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cg, err := parseProcCGroup(tmpPath)
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if err != nil {
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t.Fatal(err)
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}
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path := cg["memory"]
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if len(path) == 0 {
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t.Fatal("Path component cannot be empty")
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}
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if path != "/user.slice" {
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t.Fatal("Path component cannot be empty")
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}
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path = cg["systemd"]
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if path != "/user.slice/user-1000.slice/session-1.scope" {
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t.Fatal("Path component cannot be empty")
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}
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// Mixed cgroups with different group names.
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cgroup = `
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11:memory:/newtest/newtest
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10:blkio:/user.slice
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9:hugetlb:/
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8:net_cls,net_prio:/
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7:perf_event:/
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6:pids:/user.slice/user-1000.slice
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5:devices:/user.slice
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4:cpuset:/
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3:cpu,cpuacct:/newtest/newtest
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2:freezer:/
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1:name=systemd:/user.slice/user-1000.slice/session-1.scope
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`
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// Seek back to read from the beginning.
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tmpPath.Seek(0, 0)
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_, err = tmpPath.WriteString(cgroup)
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if err != nil {
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t.Fatal(err)
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}
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// Seek back to read from the beginning.
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tmpPath.Seek(0, 0)
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cg, err = parseProcCGroup(tmpPath)
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if err != nil {
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t.Fatal(err)
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}
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path = cg["memory"]
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if path != "/newtest/newtest" {
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t.Fatal("Path component cannot be empty")
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}
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path = cg["systemd"]
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if path != "/user.slice/user-1000.slice/session-1.scope" {
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t.Fatal("Path component cannot be empty")
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}
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}
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// Tests cgroup memory limit path construction.
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func TestMemoryLimitPath(t *testing.T) {
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testCases := []struct {
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cgroupPath string
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expectedPath string
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}{
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{
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cgroupPath: "/user.slice",
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expectedPath: "/sys/fs/cgroup/memory/user.slice/memory.limit_in_bytes",
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},
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{
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cgroupPath: "/docker/testing",
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expectedPath: "/sys/fs/cgroup/memory/memory.limit_in_bytes",
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},
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}
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for i, testCase := range testCases {
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actualPath := getMemoryLimitFilePath(testCase.cgroupPath)
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if actualPath != testCase.expectedPath {
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t.Fatalf("Test: %d: Expected: %s, got %s", i+1, testCase.expectedPath, actualPath)
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}
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}
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}
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