From: Andrea Arcangeli <andrea-atKUWr5tajBWk0Htik3J/w@public.gmane.org>
To: Christoph Lameter <clameter-sJ/iWh9BUns@public.gmane.org>
Cc: a.p.zijlstra-/NLkJaSkS4VmR6Xm/wNWPw@public.gmane.org,
Roland Dreier <rdreier-FYB4Gu1CFyUAvxtiuMwx3w@public.gmane.org>,
steiner-sJ/iWh9BUns@public.gmane.org,
linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
avi-atKUWr5tajBWk0Htik3J/w@public.gmane.org,
linux-mm-Bw31MaZKKs3YtjvyW6yDsg@public.gmane.org,
daniel.blueman-xqY44rlHlBpWk0Htik3J/w@public.gmane.org,
Robin Holt <holt-sJ/iWh9BUns@public.gmane.org>,
general-ZwoEplunGu1OwGhvXhtEPSCwEArCW2h5@public.gmane.org,
Andrew Morton
<akpm-de/tnXTf+JLsfHDXvbKv3WD2FQJk+8+b@public.gmane.org>,
kvm-devel-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org
Subject: Re: [ofa-general] Re: [patch 0/6] MMU Notifiers V6
Date: Sat, 9 Feb 2008 02:56:59 +0100 [thread overview]
Message-ID: <20080209015659.GC7051@v2.random> (raw)
In-Reply-To: <Pine.LNX.4.64.0802081725200.5445-RYO/mD75kfhx2SFC9UQUAuF7EQX82lMiAL8bYrjMMd8@public.gmane.org>
On Fri, Feb 08, 2008 at 05:27:03PM -0800, Christoph Lameter wrote:
> Pages will still be on the LRU and cycle through rmap again and again.
> If page migration is used on those pages then the code may make repeated
> attempt to migrate the page thinking that the page count must at some
> point drop.
>
> I do not think that the page count was intended to be used to pin pages
> permanently. If we had a marker on such pages then we could take them off
> the LRU and not try to migrate them.
The VM shouldn't break if try_to_unmap doesn't actually make the page
freeable for whatever reason. Permanent pins shouldn't happen anyway,
so defining an ad-hoc API for that doesn't sound too appealing. Not
sure if old hardware deserves those special lru-size-reduction
optimizations but it's not my call (certainly swapoff/mlock would get
higher priority in that lru-size-reduction area).
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next prev parent reply other threads:[~2008-02-09 1:56 UTC|newest]
Thread overview: 79+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-02-08 22:06 [patch 0/6] MMU Notifiers V6 Christoph Lameter
2008-02-08 22:06 ` [patch 1/6] mmu_notifier: Core code Christoph Lameter
2008-02-08 22:06 ` [patch 2/6] mmu_notifier: Callbacks to invalidate address ranges Christoph Lameter
2008-02-08 22:06 ` [patch 3/6] mmu_notifier: invalidate_page callbacks Christoph Lameter
2008-02-08 22:06 ` [patch 4/6] mmu_notifier: Skeleton driver for a simple mmu_notifier Christoph Lameter
2008-02-08 22:06 ` [patch 5/6] mmu_notifier: Support for drivers with revers maps (f.e. for XPmem) Christoph Lameter
2008-02-08 22:06 ` [patch 6/6] mmu_rmap_notifier: Skeleton for complex driver that uses its own rmaps Christoph Lameter
2008-02-08 22:23 ` [ofa-general] Re: [patch 0/6] MMU Notifiers V6 Andrew Morton
[not found] ` <20080208142315.7fe4b95e.akpm-de/tnXTf+JLsfHDXvbKv3WD2FQJk+8+b@public.gmane.org>
2008-02-08 23:32 ` Christoph Lameter
2008-02-08 23:36 ` [ofa-general] " Robin Holt
2008-02-08 23:41 ` Christoph Lameter
[not found] ` <Pine.LNX.4.64.0802081540180.4291-RYO/mD75kfhx2SFC9UQUAuF7EQX82lMiAL8bYrjMMd8@public.gmane.org>
2008-02-08 23:43 ` Robin Holt
2008-02-08 23:56 ` [ofa-general] " Andrew Morton
2008-02-09 0:05 ` Christoph Lameter
2008-02-09 0:12 ` Roland Dreier
2008-02-09 0:16 ` Christoph Lameter
2008-02-09 0:21 ` [ofa-general] trying to get of all lists R S
2008-02-09 0:22 ` [ofa-general] Re: [patch 0/6] MMU Notifiers V6 Roland Dreier
[not found] ` <adalk5v0yi6.fsf-FYB4Gu1CFyUAvxtiuMwx3w@public.gmane.org>
2008-02-09 0:36 ` Christoph Lameter
2008-02-09 1:24 ` Andrea Arcangeli
2008-02-09 1:27 ` Christoph Lameter
[not found] ` <Pine.LNX.4.64.0802081725200.5445-RYO/mD75kfhx2SFC9UQUAuF7EQX82lMiAL8bYrjMMd8@public.gmane.org>
2008-02-09 1:56 ` Andrea Arcangeli [this message]
2008-02-09 2:16 ` Christoph Lameter
2008-02-09 12:55 ` Rik van Riel
2008-02-09 21:46 ` Christoph Lameter
2008-02-11 22:40 ` [ofa-general] Demand paging for memory regions (was Re: MMU Notifiers V6) Roland Dreier
2008-02-12 22:01 ` [ofa-general] " Steve Wise
2008-02-12 22:10 ` Christoph Lameter
2008-02-12 22:41 ` [ofa-general] Re: Demand paging for memory regions Roland Dreier
2008-02-12 23:14 ` Felix Marti
2008-02-13 0:57 ` Christoph Lameter
2008-02-14 15:09 ` Steve Wise
2008-02-14 15:53 ` Robin Holt
2008-02-14 16:23 ` Steve Wise
2008-02-14 17:48 ` Caitlin Bestler
2008-02-14 19:39 ` Christoph Lameter
2008-02-14 20:17 ` Caitlin Bestler
2008-02-14 20:20 ` Christoph Lameter
2008-02-14 22:43 ` Caitlin Bestler
2008-02-14 22:48 ` Christoph Lameter
2008-02-15 1:26 ` Caitlin Bestler
2008-02-15 2:37 ` Christoph Lameter
2008-02-15 18:09 ` Caitlin Bestler
2008-02-15 18:45 ` Christoph Lameter
2008-02-15 18:53 ` Caitlin Bestler
2008-02-15 20:02 ` Christoph Lameter
2008-02-15 20:14 ` Caitlin Bestler
2008-02-15 22:50 ` Christoph Lameter
2008-02-15 23:50 ` Caitlin Bestler
2008-02-12 23:23 ` Jason Gunthorpe
2008-02-13 1:01 ` Christoph Lameter
2008-02-13 1:26 ` Jason Gunthorpe
2008-02-13 1:45 ` Steve Wise
2008-02-13 2:35 ` Christoph Lameter
2008-02-13 3:25 ` Jason Gunthorpe
2008-02-13 18:51 ` Christoph Lameter
2008-02-13 19:51 ` Jason Gunthorpe
2008-02-13 20:36 ` Christoph Lameter
2008-02-13 4:09 ` Christian Bell
2008-02-13 19:00 ` Christoph Lameter
2008-02-13 19:46 ` Christian Bell
2008-02-13 20:32 ` Christoph Lameter
2008-02-13 22:44 ` Kanoj Sarcar
2008-02-13 23:02 ` Christoph Lameter
2008-02-13 23:43 ` Kanoj Sarcar
2008-02-13 23:48 ` Jesse Barnes
2008-02-14 0:56 ` Andrea Arcangeli
2008-02-14 19:35 ` Christoph Lameter
2008-02-13 23:23 ` Pete Wyckoff
2008-02-14 0:01 ` Jason Gunthorpe
2008-02-27 22:11 ` Christoph Lameter
2008-02-13 1:55 ` Christian Bell
2008-02-13 2:19 ` Christoph Lameter
2008-02-13 0:56 ` Christoph Lameter
2008-02-13 12:11 ` Christoph Raisch
2008-02-13 19:02 ` Christoph Lameter
2008-02-09 0:12 ` [ofa-general] Re: [patch 0/6] MMU Notifiers V6 Andrew Morton
2008-02-09 0:18 ` Christoph Lameter
2008-02-13 14:31 ` Jack Steiner
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