f205689ff5
go fails to build Minio under at least, armv6 and 386 due to some inconsistencies in the type of one syscall variable in different architectures. This PR casts that variable to uint64 to achieve the desired consistency.
88 lines
2.4 KiB
Go
88 lines
2.4 KiB
Go
// +build linux
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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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totalRAM := uint64(si.Totalram)
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unit := uint64(si.Unit)
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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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limit = unit * totalRAM
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return limit, 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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