Package oshi.hardware.platform.linux

Class LinuxGlobalMemory

java.lang.Object

oshi.hardware.common.AbstractGlobalMemory

oshi.hardware.platform.linux.LinuxGlobalMemory

All Implemented Interfaces:

GlobalMemory

@ThreadSafe
public final class LinuxGlobalMemory
extends AbstractGlobalMemory

Memory obtained by /proc/meminfo and sysinfo.totalram

Field Summary

Fields

Modifier and Type	Field	Description
private java.util.function.Supplier<Pair<java.lang.Long,java.lang.Long>>	availTotal
private static long	PAGE_SIZE
private java.util.function.Supplier<VirtualMemory>	vm

Constructor Summary

Constructors

Constructor	Description
LinuxGlobalMemory()

Method Summary

Modifier and Type	Method	Description
private VirtualMemory	createVirtualMemory()
long	getAvailable()	The amount of physical memory currently available, in bytes.
long	getPageSize()	The number of bytes in a memory page
long	getTotal()	The amount of actual physical memory, in bytes.
VirtualMemory	getVirtualMemory()	Virtual memory, such as a swap file.
private static Pair<java.lang.Long,java.lang.Long>	readMemInfo()	Updates instance variables from reading /proc/meminfo.

Methods inherited from class oshi.hardware.common.AbstractGlobalMemory

getPhysicalMemory, toString

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Detail

PAGE_SIZE

private static final long PAGE_SIZE

availTotal

private final java.util.function.Supplier<Pair<java.lang.Long,java.lang.Long>> availTotal

vm

private final java.util.function.Supplier<VirtualMemory> vm

Constructor Detail

LinuxGlobalMemory

public LinuxGlobalMemory()

Method Detail

getAvailable

public long getAvailable()

Description copied from interface: GlobalMemory

The amount of physical memory currently available, in bytes.

Returns:

Available number of bytes.

getTotal

public long getTotal()

Description copied from interface: GlobalMemory

The amount of actual physical memory, in bytes.

Returns:

Total number of bytes.

getPageSize

public long getPageSize()

Description copied from interface: GlobalMemory

The number of bytes in a memory page

Returns:

Page size in bytes.

getVirtualMemory

public VirtualMemory getVirtualMemory()

Description copied from interface: GlobalMemory

Virtual memory, such as a swap file.

Returns:

A VirtualMemory object.

readMemInfo

private static Pair<java.lang.Long,java.lang.Long> readMemInfo()

Updates instance variables from reading /proc/meminfo. While most of the information is available in the sysinfo structure, the most accurate calculation of MemAvailable is only available from reading this pseudo-file. The maintainers of the Linux Kernel have indicated this location will be kept up to date if the calculation changes: see https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/? id=34e431b0ae398fc54ea69ff85ec700722c9da773

Internally, reading /proc/meminfo is faster than sysinfo because it only spends time populating the memory components of the sysinfo structure.

Returns:

A pair containing available and total memory in bytes

createVirtualMemory

private VirtualMemory createVirtualMemory()