(no subject)

[root]

I am leiyin, a software engineer in china, beijing. I am interested
in Linux memory management these day. Since I find an ordinary user
can easily occupy all the memory available. Though I don't think this is 
a bug. I wonder whether I can control how much memory a user can occup
,including swap space, or not.


For example, this program occupy.c 
compile: cc -o occupy occupy.c

#define BLOCK 100000
#define PGSIZE 4096
char *p[BLOCK];

main()
{
  int i,j;

  for(i=0;i<BLOCK;i++)
  {
    for(j=0;j<PGSIZE;j++)
    p[i][j]  = 0;
    }

  sleep(100000); 
}


when I run occupy. My linux system with 32 RAM soon show
Out of Memory. And any other users cannot login and work normally.

Especially in AS400 OS/400 one can distribute a fixed size physical memory
(pool) for a subsystem. If Linux can do this( I mean a fixed size memory for
a user not subsystem), I think linux will become more lovely.


Address:leiyin_linux@163.net


  
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Re: none

[Eric W. Biederman]

>>>>> "leiyin" == root  <root@ns.senbell.com.cn> writes:

leiyin> I am leiyin, a software engineer in china, beijing. I am interested
leiyin> in Linux memory management these day. Since I find an ordinary user
leiyin> can easily occupy all the memory available. Though I don't think this is 
leiyin> a bug. I wonder whether I can control how much memory a user can occup
leiyin> ,including swap space, or not.

yes.

The kernel interface is setrlimit, the user interface is usually
through the shell ulimit command.
The only per user limit I know of is number of processes.
The rest of the limits, stack size, virtual memory size etc, are per processs.

leiyin> Especially in AS400 OS/400 one can distribute a fixed size physical memory
leiyin> (pool) for a subsystem. If Linux can do this( I mean a fixed size memory for
leiyin> a user not subsystem), I think linux will become more lovely.


leiyin> Address:leiyin_linux@163.net
Your might want to set this in your reply to header.

Eric
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