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https://github.com/minio/minio.git
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91d419ee6c
This PR simply adds a warning message when it detects older kernel versions and warn's them about potential performance issues on this kernel. The issue can be seen only with parallel I/O across all drives on denser setups such as 90 drives or 45 drives per server configurations.
131 lines
3.8 KiB
Go
131 lines
3.8 KiB
Go
// Copyright (c) 2015-2022 MinIO, Inc.
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//
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// This file is part of MinIO Object Storage stack
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Affero General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Affero General Public License for more details.
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//
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// You should have received a copy of the GNU Affero General Public License
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// along with this program. If not, see <http://www.gnu.org/licenses/>.
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//go:build linux
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// +build linux
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package kernel
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import (
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"fmt"
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"io/ioutil"
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"regexp"
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"strconv"
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"strings"
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"syscall"
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)
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var versionRegex = regexp.MustCompile(`^(\d+)\.(\d+).(\d+).*$`)
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// VersionFromRelease converts a release string with format
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// 4.4.2[-1] to a kernel version number in LINUX_VERSION_CODE format.
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// That is, for kernel "a.b.c", the version number will be (a<<16 + b<<8 + c)
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func VersionFromRelease(releaseString string) (uint32, error) {
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versionParts := versionRegex.FindStringSubmatch(releaseString)
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if len(versionParts) != 4 {
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return 0, fmt.Errorf("got invalid release version %q (expected format '4.3.2-1')", releaseString)
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}
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major, err := strconv.Atoi(versionParts[1])
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if err != nil {
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return 0, err
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}
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minor, err := strconv.Atoi(versionParts[2])
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if err != nil {
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return 0, err
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}
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patch, err := strconv.Atoi(versionParts[3])
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if err != nil {
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return 0, err
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}
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return Version(major, minor, patch), nil
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}
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// Version implements KERNEL_VERSION equivalent macro
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// #define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + ((c) > 255 ? 255 : (c)))
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func Version(major, minor, patch int) uint32 {
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if patch > 255 {
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patch = 255
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}
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out := major<<16 + minor<<8 + patch
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return uint32(out)
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}
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func currentVersionUname() (uint32, error) {
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var buf syscall.Utsname
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if err := syscall.Uname(&buf); err != nil {
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return 0, err
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}
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releaseString := strings.Trim(utsnameStr(buf.Release[:]), "\x00")
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return VersionFromRelease(releaseString)
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}
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func currentVersionUbuntu() (uint32, error) {
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procVersion, err := ioutil.ReadFile("/proc/version_signature")
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if err != nil {
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return 0, err
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}
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var u1, u2, releaseString string
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_, err = fmt.Sscanf(string(procVersion), "%s %s %s", &u1, &u2, &releaseString)
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if err != nil {
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return 0, err
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}
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return VersionFromRelease(releaseString)
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}
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var debianVersionRegex = regexp.MustCompile(`.* SMP Debian (\d+\.\d+.\d+-\d+)(?:\+[[:alnum:]]*)?.*`)
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func parseDebianVersion(str string) (uint32, error) {
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match := debianVersionRegex.FindStringSubmatch(str)
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if len(match) != 2 {
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return 0, fmt.Errorf("failed to parse kernel version from /proc/version: %s", str)
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}
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return VersionFromRelease(match[1])
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}
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func currentVersionDebian() (uint32, error) {
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procVersion, err := ioutil.ReadFile("/proc/version")
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if err != nil {
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return 0, fmt.Errorf("error reading /proc/version: %s", err)
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}
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return parseDebianVersion(string(procVersion))
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}
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// CurrentVersion returns the current kernel version in
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// LINUX_VERSION_CODE format (see VersionFromRelease())
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func CurrentVersion() (uint32, error) {
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// We need extra checks for Debian and Ubuntu as they modify
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// the kernel version patch number for compatibility with
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// out-of-tree modules. Linux perf tools do the same for Ubuntu
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// systems: https://github.com/torvalds/linux/commit/d18acd15c
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//
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// See also:
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// https://kernel-team.pages.debian.net/kernel-handbook/ch-versions.html
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// https://wiki.ubuntu.com/Kernel/FAQ
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version, err := currentVersionUbuntu()
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if err == nil {
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return version, nil
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}
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version, err = currentVersionDebian()
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if err == nil {
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return version, nil
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}
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return currentVersionUname()
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}
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