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

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Message-ID: <20150729153135.GW8100@esperanza>
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
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