lkml.org 
[lkml]   [2020]   [Mar]   [11]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
From
Date
SubjectRe: interaction of MADV_PAGEOUT with CoW anonymous mappings?
On Wed, Mar 11, 2020 at 1:45 AM Michal Hocko <mhocko@kernel.org> wrote:
>
> On Tue 10-03-20 15:48:31, Dave Hansen wrote:
> > Maybe instead of just punting on MADV_PAGEOUT for map_count>1 we should
> > only let it affect the *local* process. We could still put the page in
> > the swap cache, we just wouldn't go do the rmap walk.
>
> Is it really worth medling with the reclaim code and special case
> MADV_PAGEOUT there? I mean it is quite reasonable to have an initial
> implementation that doesn't really touch shared pages because that can
> lead to all sorts of hard to debug and unexpected problems. So I would
> much rather go with a simple patch to check map count first and see
> whether somebody actually cares about those shared pages and go from
> there.
>
> Minchan, do you want to take my diff and turn it into the proper patch
> or should I do it.
>

What about the remote_madvise(MADV_PAGEOUT)? Will your patch disable
the pageout from that code path as well for pages with mapcount > 1?

\
 
 \ /
  Last update: 2020-03-12 00:54    [W:0.080 / U:0.760 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site