lkml.org 
[lkml]   [2016]   [May]   [2]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: mm: pages are not freed from lru_add_pvecs after process termination
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

\
 
 \ /
  Last update: 2016-05-02 18:21    [W:0.160 / U:0.176 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site