Re: [PATCH][RFC][0/4] InfiniBand userspace verbs implementation

Christoph Hellwig
2005-04-25T13:18:05Z

On Mon, Apr 25, 2005 at 06:15:10AM -0700, Roland Dreier wrote:
> Does it seem reasonable to add a new system call to let userspace mark
> memory it doesn't want copied into forked processes? Something like
>
> long sys_mark_nocopy(unsigned long addr, size_t len, int mark)
>
> which would set VM_DONTCOPY if mark != 0, and clear it if mark == 0.
> A better name would be gratefully accepted...

add a new MAP_DONTCOPY flag and accept it in mmap and mprotect?