VmSize : Regarding /proc/<pid>/status
 

Hi all!

As far as i know, VmSize is the Virtual memory usage of the entire process
and
VmSize = VmLib + VmExe + VmData +VmStk
We have only four segments(code, data, heap, stack) and VmSize include all of them.

Code and data segment:
VmLib = VM usage of dynamically linked libraries
VmExe =VM usage of exe's and statically linked libraries
Heap:
VmData = VM usage of heap.
Stack:
VmStk = VM usage of stack.

But in the below given example VmSize >> VmLib + VmExe + VmData +VmStk
what does that indicate?

bash-2.05b# cat /proc/16108/status
Name: thunderbird
State: S (sleeping)
Tgid: 16108
Pid: 16108
PPid: 4436
TracerPid: 0
Uid: 0 0 0 0
Gid: 0 0 0 0
FDSize: 256
Groups: 0 1 2 3 4 6 10
VmSize: 4156 kB
VmLck: 0 kB
VmRSS: 4 kB
VmData: 108 kB
VmStk: 24 kB
VmExe: 592 kB
VmLib: 1312 kB
SigPnd: 0000000000000000
SigBlk: 0000000000010000
SigIgn: 8000000000000004
SigCgt: 0000000000010002
CapInh: 0000000000000000
CapPrm: 00000000fffffeff
CapEff: 00000000fffffeff

Can nyone tell me the links from where i can get proper info about memory profiling and memory limiting??

thanks in advance,

Shivali