Re: [RFC] Limit mappings to ten per page per process

[Kirill A. Shutemov]

On Thu, Feb 08, 2018 at 01:37:43PM -0800, Matthew Wilcox wrote:
> On Thu, Feb 08, 2018 at 12:21:00PM -0800, Matthew Wilcox wrote:
> > Now that I think about it, though, perhaps the simplest solution is not
> > to worry about checking whether _mapcount has saturated, and instead when
> > adding a new mmap, check whether this task already has it mapped 10 times.
> > If so, refuse the mapping.
> 
> That turns out to be quite easy.  Comments on this approach?

This *may* break some remap_file_pages() users.

And it may be rather costly for popular binaries. Consider libc.so.

-- 
 Kirill A. Shutemov