On Wed, Jul 29, 2015 at 08:08:22AM -0700, Michel Lespinasse wrote:

On Wed, Jul 29, 2015 at 7:45 AM, Vladimir Davydov [off-list ref]
wrote:

quoted

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