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From: Vladimir Davydov <vdavydov-bzQdu9zFT3WakBO8gow8eQ@public.gmane.org>
To: Andrew Morton <akpm-de/tnXTf+JLsfHDXvbKv3WD2FQJk+8+b@public.gmane.org>
Cc: Andres Lagar-Cavilla
	<andreslc-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>,
	Minchan Kim <minchan-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>,
	Raghavendra K T
	<raghavendra.kt-23VcF4HTsmIX0ybBhKVfKdBPR1lH4CV8@public.gmane.org>,
	Johannes Weiner <hannes-druUgvl0LCNAfugRpC6u6w@public.gmane.org>,
	Michal Hocko <mhocko-AlSwsSmVLrQ@public.gmane.org>,
	Greg Thelen <gthelen-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>,
	Michel Lespinasse
	<walken-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>,
	David Rientjes <rientjes-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>,
	Pavel Emelyanov <xemul-bzQdu9zFT3WakBO8gow8eQ@public.gmane.org>,
	Cyrill Gorcunov
	<gorcunov-GEFAQzZX7r8dnm+yROfE0A@public.gmane.org>,
	Jonathan Corbet <corbet-T1hC0tSOHrs@public.gmane.org>,
	linux-api-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
	linux-doc-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
	linux-mm-Bw31MaZKKs3YtjvyW6yDsg@public.gmane.org,
	cgroups-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
	linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
Subject: Re: [PATCH -mm v9 7/8] proc: export idle flag via kpageflags
Date: Wed, 22 Jul 2015 19:25:28 +0300	[thread overview]
Message-ID: <20150722162528.GN23374@esperanza> (raw)
In-Reply-To: <20150721163500.528bd39bbbc71abc3c8d429b-de/tnXTf+JLsfHDXvbKv3WD2FQJk+8+b@public.gmane.org>

On Tue, Jul 21, 2015 at 04:35:00PM -0700, Andrew Morton wrote:
> On Sun, 19 Jul 2015 15:31:16 +0300 Vladimir Davydov <vdavydov-bzQdu9zFT3WakBO8gow8eQ@public.gmane.org> wrote:
> 
> > As noted by Minchan, a benefit of reading idle flag from
> > /proc/kpageflags is that one can easily filter dirty and/or unevictable
> > pages while estimating the size of unused memory.
> > 
> > Note that idle flag read from /proc/kpageflags may be stale in case the
> > page was accessed via a PTE, because it would be too costly to iterate
> > over all page mappings on each /proc/kpageflags read to provide an
> > up-to-date value. To make sure the flag is up-to-date one has to read
> > /proc/kpageidle first.
> 
> Is there any value in teaching the regular old page scanner to update
> these flags?  If it's doing an rmap scan anyway...

I don't understand what you mean by "regular old page scanner". Could
you please elaborate?

Thanks,
Vladimir

  parent reply	other threads:[~2015-07-22 16:25 UTC|newest]

Thread overview: 57+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-07-19 12:31 [PATCH -mm v9 0/8] idle memory tracking Vladimir Davydov
2015-07-19 12:31 ` [PATCH -mm v9 1/8] memcg: add page_cgroup_ino helper Vladimir Davydov
2015-07-21 23:34   ` Andrew Morton
2015-07-22  9:21     ` Vladimir Davydov
2015-07-19 12:31 ` [PATCH -mm v9 2/8] hwpoison: use page_cgroup_ino for filtering by memcg Vladimir Davydov
2015-07-21 23:34   ` Andrew Morton
     [not found]     ` <20150721163412.1b44e77f5ac3b742734d1ce6-de/tnXTf+JLsfHDXvbKv3WD2FQJk+8+b@public.gmane.org>
2015-07-22  9:45       ` Vladimir Davydov
2015-07-19 12:31 ` [PATCH -mm v9 3/8] memcg: zap try_get_mem_cgroup_from_page Vladimir Davydov
2015-07-19 12:31 ` [PATCH -mm v9 4/8] proc: add kpagecgroup file Vladimir Davydov
2015-07-21 23:34   ` Andrew Morton
     [not found]     ` <20150721163433.618855e1f61536a09dfac30b-de/tnXTf+JLsfHDXvbKv3WD2FQJk+8+b@public.gmane.org>
2015-07-22 10:33       ` Vladimir Davydov
2015-07-19 12:31 ` [PATCH -mm v9 5/8] mmu-notifier: add clear_young callback Vladimir Davydov
2015-07-20 18:34   ` Andres Lagar-Cavilla
2015-07-21  8:51     ` Vladimir Davydov
2015-07-22 16:33       ` Vladimir Davydov
2015-07-19 12:31 ` [PATCH -mm v9 6/8] proc: add kpageidle file Vladimir Davydov
2015-07-21 23:34   ` Andrew Morton
     [not found]     ` <20150721163452.c1e4075a2b193bcd325fad56-de/tnXTf+JLsfHDXvbKv3WD2FQJk+8+b@public.gmane.org>
2015-07-22 15:20       ` Vladimir Davydov
     [not found]   ` <d7a78b72053cf529c0c9ff6cbc02ffbb3d58fe35.1437303956.git.vdavydov-bzQdu9zFT3WakBO8gow8eQ@public.gmane.org>
2015-07-24 14:08     ` Paul Gortmaker
     [not found]       ` <CAP=VYLqiNfQJ6oyQg2GszeHwdOmeY_uD3XPvw=++weJOKdx4_g-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2015-07-24 14:17         ` Vladimir Davydov
2015-07-19 12:31 ` [PATCH -mm v9 7/8] proc: export idle flag via kpageflags Vladimir Davydov
2015-07-21 23:35   ` Andrew Morton
     [not found]     ` <20150721163500.528bd39bbbc71abc3c8d429b-de/tnXTf+JLsfHDXvbKv3WD2FQJk+8+b@public.gmane.org>
2015-07-22 16:25       ` Vladimir Davydov [this message]
2015-07-22 19:44         ` Andrew Morton
2015-07-22 20:46           ` Andres Lagar-Cavilla
2015-07-23  7:57             ` Vladimir Davydov
2015-07-19 12:31 ` [PATCH -mm v9 8/8] proc: add cond_resched to /proc/kpage* read/write loop Vladimir Davydov
     [not found] ` <cover.1437303956.git.vdavydov-bzQdu9zFT3WakBO8gow8eQ@public.gmane.org>
2015-07-19 12:37   ` [PATCH -mm v9 0/8] idle memory tracking Vladimir Davydov
2015-07-21 21:39 ` Andres Lagar-Cavilla
2015-07-21 23:34 ` Andrew Morton
2015-07-22 16:23   ` Vladimir Davydov
2015-07-25 16:24     ` Vladimir Davydov
2015-07-27 19:18   ` Kees Cook
2015-07-27 19:25     ` Andrew Morton
2015-07-29 12:36 ` Michal Hocko
     [not found]   ` <20150729123629.GI15801-2MMpYkNvuYDjFM9bn6wA6Q@public.gmane.org>
2015-07-29 13:59     ` Vladimir Davydov
2015-07-29 14:12       ` Michel Lespinasse
     [not found]         ` <CANN689HJX2ZL891uOd8TW9ct4PNH9d5odQZm86WMxkpkCWhA-w-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2015-07-29 14:13           ` Michel Lespinasse
2015-07-29 14:45           ` Vladimir Davydov
2015-07-29 15:08             ` Michel Lespinasse
     [not found]               ` <CANN689Euq3Y-CHQo8q88vzFAYZX4S6rK+rZRfbuSKfS74u=gcg-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2015-07-29 15:31                 ` Vladimir Davydov
2015-07-29 15:34                   ` Michel Lespinasse
2015-07-29 15:08             ` Michal Hocko
     [not found]               ` <20150729150855.GM15801-2MMpYkNvuYDjFM9bn6wA6Q@public.gmane.org>
2015-07-29 15:36                 ` Vladimir Davydov
2015-07-29 15:58                   ` Michal Hocko
2015-07-29 14:26       ` Michal Hocko
2015-07-29 15:28         ` Vladimir Davydov
2015-07-29 15:47           ` Michal Hocko
     [not found]             ` <20150729154718.GN15801-2MMpYkNvuYDjFM9bn6wA6Q@public.gmane.org>
2015-07-29 16:29               ` Vladimir Davydov
2015-07-29 21:30                 ` Andrew Morton
2015-07-30  9:12                   ` Vladimir Davydov
2015-07-30 13:01                     ` Vladimir Davydov
2015-07-31  9:34                       ` Vladimir Davydov
2015-07-30  9:07                 ` Michal Hocko
     [not found]                   ` <20150730090708.GE9387-2MMpYkNvuYDjFM9bn6wA6Q@public.gmane.org>
2015-07-30  9:31                     ` Vladimir Davydov
2015-07-29 15:55           ` Andres Lagar-Cavilla
     [not found]             ` <CAJu=L59RdowYjTyVM0Vhz79A4d=d8=ZmU7PB59CmEj5B0_c48Q-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2015-07-29 16:37               ` Vladimir Davydov

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