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From: Robin Holt <holt@sgi.com>
To: Christoph Lameter <clameter@sgi.com>
Cc: Andrew Morton <akpm@linux-foundation.org>,
andrea@qumranet.com, holt@sgi.com, avi@qumranet.com,
izike@qumranet.com, kvm-devel@lists.sourceforge.net,
a.p.zijlstra@chello.nl, steiner@sgi.com,
linux-kernel@vger.kernel.org, linux-mm@kvack.org,
daniel.blueman@quadrics.com, general@lists.openfabrics.org
Subject: Re: [patch 0/6] MMU Notifiers V6
Date: Fri, 8 Feb 2008 17:36:37 -0600 [thread overview]
Message-ID: <20080208233636.GG26564@sgi.com> (raw)
In-Reply-To: <Pine.LNX.4.64.0802081528070.4036@schroedinger.engr.sgi.com>
On Fri, Feb 08, 2008 at 03:32:19PM -0800, Christoph Lameter wrote:
> On Fri, 8 Feb 2008, Andrew Morton wrote:
>
> > What about ib_umem_get()?
>
> Ok. It pins using an elevated refcount. Same as XPmem right now. With that
> we effectively pin a page (page migration will fail) but we will
> continually be reclaiming the page and may repeatedly try to move it. We
> have issues with XPmem causing too many pages to be pinned and thus the
> OOM getting into weird behavior modes (OOM or stop lru scanning due to
> all_reclaimable set).
>
> An elevated refcount will also not be noticed by any of the schemes under
> consideration to improve LRU scanning performance.
Christoph, I am not sure what you are saying here. With v4 and later,
I thought we were able to use the rmap invalidation to remove the ref
count that XPMEM was holding and therefore be able to swapout. Did I miss
something? I agree the existing XPMEM does pin. I hope we are not saying
the XPMEM based upon these patches will not be able to swap/migrate.
Thanks,
Robin
next prev parent reply other threads:[~2008-02-08 23:36 UTC|newest]
Thread overview: 81+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-02-08 22:06 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 ` [patch 0/6] MMU Notifiers V6 Andrew Morton
2008-02-08 23:32 ` Christoph Lameter
2008-02-08 23:36 ` Robin Holt [this message]
2008-02-08 23:41 ` Christoph Lameter
2008-02-08 23:43 ` Robin Holt
2008-02-08 23:56 ` Andrew Morton
2008-02-09 0:05 ` Christoph Lameter
2008-02-09 0:12 ` [ofa-general] " Roland Dreier
2008-02-09 0:16 ` Christoph Lameter
2008-02-09 0:22 ` Roland Dreier
2008-02-09 0:36 ` Christoph Lameter
2008-02-09 1:24 ` Andrea Arcangeli
2008-02-09 1:27 ` Christoph Lameter
2008-02-09 1:56 ` Andrea Arcangeli
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 ` Demand paging for memory regions (was Re: MMU Notifiers V6) Roland Dreier
2008-02-12 22:01 ` 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 3:56 ` Patrick Geoffray
2008-02-13 4:26 ` Jason Gunthorpe
2008-02-13 4:47 ` Patrick Geoffray
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 ` [ofa-general] " 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 ` [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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