memory allocated for process stack seems never to be freed by the kernel..
on a vmware machine with about 768m memory, run the following program.when
printing "run over", run another case of the following program. oom-killer
trigered, which is not so reasonable.
#include <stdio.h>
#include <sys/time.h>
#include <sys/resource.h>
#include <alloca.h>
void*stack=NULL;
const long water_mark=512*1024*1024;
void func()
{
int p=0;
if((long)stack-(long)&p> water_mark)
{
printf("hit\n");
}
else
{
func();
}
return;
}
int main()
{
struct rlimit limit;
limit.rlim_cur=1024*1024*1024*1.5;
limit.rlim_max=1024*1024*1024*1.5;
setrlimit(RLIMIT_STACK,&limit);
int a=0;
stack=&a;
printf("run\n");
//getchar();
func();
printf("run over\n");
getchar();
return 0;
}
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