Re: [PATCH -mm v9 0/8] idle memory tracking

Vladimir Davydov
2015-07-29T15:31:35Z

On Wed, Jul 29, 2015 at 08:08:22AM -0700, Michel Lespinasse wrote:
> On Wed, Jul 29, 2015 at 7:45 AM, Vladimir Davydov <vdavydov-bzQdu9zFT3WakBO8gow8eQ@public.gmane.org>
> wrote:
> > Page table scan approach has the inherent problem - it ignores unmapped
> > page cache. If a workload does a lot of read/write or map-access-unmap
> > operations, we won't be able to even roughly estimate its wss.
>
> You can catch that in mark_page_accessed on those paths, though.

Actually, the problem here is how to find an unmapped page cache page
*to mark it idle*, not to mark it accessed.

Thanks,
Vladimir