On Wed, Jul 29, 2015 at 8:31 AM, Vladimir Davydov wrote: > 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@parallels.com> > > 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. > Ah, yes. When I tried that I was still scanning memory by address at the end just to compute such totals - but I did not have to do rmap at that point anymore. It did look incredibly lame, though. -- Michel "Walken" Lespinasse A program is never fully debugged until the last user dies.