> On Friday 27 February 2004 15:24, Benoît Lefebvre wrote:
> > Hi,
> >
> > Consider the following lines of code from mlock.c
> >
> > asmlinkage long sys_mlockall(int flags)
> > {
> > unsigned long lock_limit;
> > ...
> >
> > lock_limit = current->rlim[RLIMIT_MEMLOCK].rlim_cur;
> > lock_limit >>= PAGE_SHIFT;
> > ...
> > if (current->mm->total_vm > lock_limit)
> > goto out;
> > ...
> >
> > My question is about "lock_limit >>= PAGE_SHIFT;". I dont understand
> > why this line is needed. Why we cannot just compare rlim_cur with
> > current->mm->total_vm?
>
> If you did, would you not be comparing bytes to pages?
Yes, you're right. I thought rlim_cur was the maximum number of pages
nonswappable but its the maximum size of nonswappable memory in bytes.
Thanks
>
>
>
> --
> Kernelnewbies: Help each other learn about the Linux kernel.
> Archive: http://mail.nl.linux.org/kernelnewbies/
> FAQ: http://kernelnewbies.org/faq/
>
>
>
--
Kernelnewbies: Help each other learn about the Linux kernel.
Archive: http://mail.nl.linux.org/kernelnewbies/
FAQ: http://kernelnewbies.org/faq/
