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86 lines
2.3 KiB
86 lines
2.3 KiB
// +build linux,!arm,!386
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/*
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* MinIO Cloud Storage, (C) 2016,2017 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 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) * 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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