On Fri, 17 Apr 2020 12:04:17 +0200 Peter Zijlstra <peterz@xxxxxxxxxxxxx> wrote: > On Fri, Apr 17, 2020 at 09:05:08AM +0200, SeongJae Park wrote: > > I think the main idea of DAMON[1] might be able to applied here. Have you > > considered it? > > > > [1] https://lore.kernel.org/linux-mm/20200406130938.14066-1-sjpark@xxxxxxxxxx/ > > I've ignored that entire thing after you said the information it > provides was already available through the PMU. Sorry if my answer made you confused. What I wanted to say was that the fundamental access checking mechanism that DAMON depends on is PTE Accessed bit for now, but it could be modified to use PMU or other features instead. In other words, PMU on some architectures could provide the fundamental, low level information for DAMON, as PTE Accessed bit does. What DAMON does are efficient control of the fundamental access checking features and making of elaborated final informations, which PMU itself doesn't provide. Thanks, SeongJae Park
