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88 lines
2.5 KiB
Go
88 lines
2.5 KiB
Go
// +build linux,!arm,!386
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// Copyright (c) 2015-2021 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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package sys
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import (
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"os"
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"syscall"
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"github.com/minio/minio/pkg/cgroup"
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)
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// Get the final system memory limit chosen by the user.
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// by default without any configuration on a vanilla Linux
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// system you would see physical RAM limit. If cgroup
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// is configured at some point in time this function
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// would return the memory limit chosen for the given pid.
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func getMemoryLimit() (sysLimit uint64, err error) {
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if sysLimit, err = getSysinfoMemoryLimit(); err != nil {
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// Physical memory info is not accessible, just exit here.
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return 0, err
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}
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// Following code is deliberately ignoring the error.
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cGroupLimit, gerr := cgroup.GetMemoryLimit(os.Getpid())
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if gerr != nil {
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// Upon error just return system limit.
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return sysLimit, nil
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}
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// cgroup limit is lesser than system limit means
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// user wants to limit the memory usage further
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// treat cgroup limit as the system limit.
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if cGroupLimit <= sysLimit {
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sysLimit = cGroupLimit
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}
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// Final system limit.
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return sysLimit, nil
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}
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// Get physical RAM size of the node.
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func getSysinfoMemoryLimit() (limit uint64, err error) {
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var si syscall.Sysinfo_t
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if err = syscall.Sysinfo(&si); err != nil {
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return 0, err
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}
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// Some fields in syscall.Sysinfo_t have different integer sizes
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// in different platform architectures. Cast all fields to uint64.
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unit := si.Unit
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totalRAM := si.Totalram
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// Total RAM is always the multiplicative value
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// of unit size and total ram.
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return uint64(unit) * uint64(totalRAM), nil
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}
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// GetStats - return system statistics, currently only
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// supported value is TotalRAM.
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func GetStats() (stats Stats, err error) {
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var limit uint64
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limit, err = getMemoryLimit()
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if err != nil {
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return Stats{}, err
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}
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stats.TotalRAM = limit
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return stats, nil
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}
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