pmm.md - Openharmony v1.0 / docs / docs-en / kernel - 最全华为鸿蒙分布式操作系统技术资料库，手册，指南

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pmm.md

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# pmm
## Command Function
This command is used to check the usage of the physical pages and page cache of the system memory.
## Syntax
pmm
## Parameter Description
None
## Usage
This command is available only in the **Debug** version.
## Example
Enter **pmm**.
## Output
**Figure 1** Viewing the usage of physical pages
![](figures/viewing-the-usage-of-physical-pages.png "viewing-the-usage-of-physical-pages")
**Table 1** Output description

Parameter	Description
phys_seg	Indicates the address of the physical page control block.
base	Indicates the first physical page address, that is, start address of the physical page memory.
size	Indicates the size of the physical page memory.
free_pages	Indicates the number of idle physical pages.
active anon	Indicates the number of active anonymous pages in the page cache.
inactive anon	Indicates the number of inactive anonymous pages in the page cache.
active file	Indicates the number of active file pages in the page cache.
inactive file	Indicates the number of inactive file pages in the page cache.
pmm pages	total: indicates the total number of physical pages. used: indicates the number of used physical pages. free: indicates the number of idle physical pages.