# vmm - [Command Function](#section445335110416) - [Syntax](#section1795712553416) - [Parameter Description](#section92544592410) - [Usage](#section104151141252) - [Example](#section11545171957) - [Output](#section075617368542) ## Command Function This command is used to query the virtual memory usage of a process. ## Syntax vmm \[_-a / -h / --help_\] vmm \[_pid_\] ## Parameter Description **Table 1** Parameters

Parameter	Description	Value Range
-a	Displays the virtual memory usage of all processes.	N/A
-h \| --help	Displays the help information.	N/A
pid	Indicates the ID of the process to query.	[0, 63]

## Usage By default, the virtual memory usage of all processes is displayed. ## Example Enter **vmm 3**. ## Output **Figure 1** Virtual memory usage of the process with PID 3 ![](figures/virtual-memory-usage-of-the-process-with-pid-3.png "virtual-memory-usage-of-the-process-with-pid-3") **Table 2** Basic process information

Parameter	Description
PID	Indicates the process ID.
aspace	Indicates the address of the virtual memory control block.
name	Indicates the process name.
base	Indicates the start address of the virtual memory.
size	Indicates the size of virtual memory.
pages	Indicates the number of used physical pages.

**Table 3** Virtual memory region information

Parameter	Description
region	Indicates the address of the control block in the virtual memory region.
name	Indicates the name of the virtual memory region.
base	Indicates the start address of the virtual memory region.
size	Indicates the size of the virtual memory region.
mmu_flags	Indicates the MMU mapping attribute of the virtual memory region.
pages	Indicates the number of used physical pages (including the shared memory).
pg/ref	Indicates the number of used physical pages.