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Date: Wed, 29 Jul 2015 18:31:35 +0300 From: Vladimir Davydov <vdavydov@...allels.com> To: Michel Lespinasse <walken@...gle.com> CC: Michal Hocko <mhocko@...nel.org>, Andrew Morton <akpm@...ux-foundation.org>, Andres Lagar-Cavilla <andreslc@...gle.com>, Minchan Kim <minchan@...nel.org>, Raghavendra K T <raghavendra.kt@...ux.vnet.ibm.com>, Johannes Weiner <hannes@...xchg.org>, Greg Thelen <gthelen@...gle.com>, David Rientjes <rientjes@...gle.com>, "Pavel Emelyanov" <xemul@...allels.com>, Cyrill Gorcunov <gorcunov@...nvz.org>, Jonathan Corbet <corbet@....net>, <linux-api@...r.kernel.org>, <linux-doc@...r.kernel.org>, <linux-mm@...ck.org>, <cgroups@...r.kernel.org>, <linux-kernel@...r.kernel.org> Subject: Re: [PATCH -mm v9 0/8] idle memory tracking 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@...allels.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. Thanks, Vladimir -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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