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u/rlimits (vs2.0)

Limit ProcFS config Code Unit Description
-t CPU   cpu U- s amount of cpu time in seconds
-f FSIZE   fsize U- kb size of files created by the shell
-d DATA   data U- kb size of a process's data segment
-s STACK   stack U- kb stack size
-c CORE   core U- kb size of core files created
-m RSS RSS rss -R page resident set size
-u NPROC PROC nproc UR 1 number of processes
-n NOFILE FILES nofile UR 1 number of file handles
-l MEMLOCK VML memlock UR page pages locked into memory
-v AS/VM VM as -R page virtual memory pages
-? LOCKS LOCKS locks UR 1 file system locks
-? SIGPENDING    Ur 1 pending signals
-p MSGQUEUE MSGQ   -r 512b message queue size
-? NICE    U- 1 minimum nice level
-? RTPRIO    U- 1 maximum realtime prio
VLimit      
-- NSOCK (16) SOCK   -R 1 number of sockets
-- OPENFD (17) OFD   -R 1 number of file descriptors
-- ANON (18) ANON   -r page anonymous memory pages
-- SHMEM (19) SHM   -r page shared memory pages

Code Description
U ... ulimit (supported)
R ... rlimit (fully supported)
r ... rlimit (accounted/planned)
- ... unsupported

Resource Limiting The Whole VServer

RSS and AS, at least, can be applied across the whole VServer. See Caps And Flags for details.

Examples

When calculating limits which use pages such as RSS, AS, you will need to know the size of a page. On x86, the size of a page is 4k. On x86_64, it is usually either 4k or 16k.

For example, if RSS (the real memory) and VM (the virtual address space) should be restricted, the appropriate config files could be the following. Note that you might have to create these directories.

# ls -al /etc/vservers/vs27/rlimits
total 28
drwxr-xr-x  2 root root 4096 2005-08-24 12:37 .
drwxr-xr-x  5 root root 4096 2005-08-24 00:22 ..
-rw-r--r--  1 root root    6 2005-08-24 12:43 as
-rw-r--r--  1 root root    6 2005-08-24 00:36 memlock
-rw-r--r--  1 root root    5 2005-08-24 12:42 nproc
-rw-r--r--  1 root root    6 2005-08-24 12:37 rss

# cat /etc/vservers/vs27/rlimits/rss
10000

# cat /etc/vservers/vs27/rlimits/as
90000

ProcFS shows current values of the limits:

# cat /proc/virtual/27/limit
PROC:            6              18            5000           0
VM:           3705           23158           90000           0
VML:             0               0           10000           0
RSS:          1344            7965           10000           0
ANON:          205             205              -1           0
FILES:          87             150              -1           0
OFD:            37              37              -1           0
LOCKS:           2               6              -1           0
SOCK:            3               3              -1           0
MSGQ:            0               0              -1           0
SHM:             0               0              -1           0

Columns are:

  1. (short) name
  2. current value
  3. observed maximum
  4. hard limit (maximum)
  5. number of hits (max)

So column 5 shows how often the maximum was reached and the kernel had to deny a resource request.

To be continued ...