代码拉取完成,页面将自动刷新
同步操作将从 tupelo-shen/mysnapd 强制同步,此操作会覆盖自 Fork 仓库以来所做的任何修改,且无法恢复!!!
确定后同步将在后台操作,完成时将刷新页面,请耐心等待。
// -*- Mode: Go; indent-tabs-mode: t -*-
/*
* Copyright (C) 2021 Canonical Ltd
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 3 as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
package osutil
import (
"bufio"
"fmt"
"os"
"strconv"
"strings"
)
var (
procMeminfo = "/proc/meminfo"
)
// TotalUsableMemory returns the total usable memory in the system in bytes.
//
// Usable means (MemTotal - CmaTotal), i.e. the total amount of memory
// minus the space reserved for the CMA (Contiguous Memory Allocator).
//
// CMA memory is taken up by e.g. the framebuffer on the Raspberry Pi or
// by DSPs on specific boards.
func TotalUsableMemory() (totalMem uint64, err error) {
f, err := os.Open(procMeminfo)
if err != nil {
return 0, err
}
defer f.Close()
s := bufio.NewScanner(f)
var memTotal, cmaTotal uint64
for s.Scan() {
var p *uint64
l := strings.TrimSpace(s.Text())
switch {
case strings.HasPrefix(l, "MemTotal:"):
p = &memTotal
case strings.HasPrefix(l, "CmaTotal:"):
p = &cmaTotal
default:
continue
}
fields := strings.Fields(l)
if len(fields) != 3 || fields[2] != "kB" {
return 0, fmt.Errorf("cannot process unexpected meminfo entry %q", l)
}
v, err := strconv.ParseUint(fields[1], 10, 64)
if err != nil {
return 0, fmt.Errorf("cannot convert memory size value: %v", err)
}
*p = v * 1024
}
if err := s.Err(); err != nil {
return 0, err
}
if memTotal == 0 {
return 0, fmt.Errorf("cannot determine the total amount of memory in the system from %s", procMeminfo)
}
return memTotal - cmaTotal, nil
}
func MockProcMeminfo(newPath string) (restore func()) {
MustBeTestBinary("mocking can only be done from tests")
oldProcMeminfo := procMeminfo
procMeminfo = newPath
return func() {
procMeminfo = oldProcMeminfo
}
}
此处可能存在不合适展示的内容,页面不予展示。您可通过相关编辑功能自查并修改。
如您确认内容无涉及 不当用语 / 纯广告导流 / 暴力 / 低俗色情 / 侵权 / 盗版 / 虚假 / 无价值内容或违法国家有关法律法规的内容,可点击提交进行申诉,我们将尽快为您处理。