Kefeng Wang wrote:
> Hi All,
>
> Mlocked in meminfo will be increasing with an small testcase, and never be
> released in mainline,
> here is a testcase[1] to reproduce the issue, but the centos7.2/7.3 will not
> increase.
>
> Is it normal?
I confirmed your problem also occurs in Linux 4.11 using below testcase.
MemFree is not decreasing while Mlocked is increasing.
Thus, it seems to be statistics accounting bug.
----------
#include <sys/mman.h>
#include <stdlib.h>
#include <unistd.h>
int main(int argc, char ** argv)
{
int i;
for (i = 0; i < 128; i++)
if (fork() == 0) {
malloc(1048576);
while (1) {
mlockall(MCL_CURRENT | MCL_FUTURE);
munlockall();
}
}
return 0;
}
----------
