Re: mm: pages are not freed from lru_add_pvecs after process termination

[Kirill A. Shutemov]

On Mon, May 02, 2016 at 08:49:03AM -0700, Dave Hansen wrote:
> On 05/02/2016 08:01 AM, Kirill A. Shutemov wrote:
> > On Mon, May 02, 2016 at 04:39:35PM +0200, Vlastimil Babka wrote:
> >> On 04/27/2016 07:11 PM, Dave Hansen wrote:
> >>> 6. Perhaps don't use the LRU pagevecs for large pages.  It limits the
> >>>    severity of the problem.
> >>
> >> I think that makes sense. Being large already amortizes the cost per base
> >> page much more than pagevecs do (512 vs ~22 pages?).
> > 
> > We try to do this already, don't we? Any spefic case where we have THPs on
> > pagevecs?
> 
> Lukas was hitting this on a RHEL 7 era kernel.  In his kernel at least,
> I'm pretty sure THP's were ending up on pagevecs.  Are you saying you
> don't think we're doing that any more?

As Vlastimil pointed, we do. It need to be fixed, I think.

Any volunteer? :-P

-- 
 Kirill A. Shutemov