$ cat /proc/[pid]/status| grep Vm
VmPeak: 704480 kB
VmSize: 647140 kB
VmLck: 0 kB
VmPin: 0 kB
VmHWM: 13192 kB
VmRSS: 13192 kB
VmData: 235720 kB
VmStk: 140 kB
VmExe: 10556 kB
VmLib: 2056 kB
VmPTE: 208 kB
VmSwap: 0 kB
man proc | vim -
/\/proc\/\[pid\]\/status
* VmPeak: Peak virtual memory size.
* VmSize: Virtual memory size.
* VmLck: Locked memory size (see mlock(3)).
* VmPin: Pinned memory size (since Linux 3.2). These are pages that can't be moved because something needs to directly access physical memory.
* VmHWM: Peak resident set size ("high water mark").
* VmRSS: Resident set size.
* VmData, VmStk, VmExe: Size of data, stack, and text segments.
* VmLib: Shared library code size.
* VmPTE: Page table entries size (since Linux 2.6.10).
* VmPMD: Size of second-level page tables (since Linux 4.0).
* VmSwap: Swapped-out virtual memory size by anonymous private pages; shmem swap usage is not included (since Linux 2.6.34).
VmRss 就是实际占用的物理内存大小。
Resident set size
In computing, resident set size (RSS) is the portion of memory occupied by a process that is held in main memory (RAM). The rest of the occupied memory exists in the swap space or file system, either because some parts of the occupied memory were paged out, or because some parts of the executable were never loaded.
