From: David Vrabel <david.vrabel@citrix.com>
To: Matt Wilson <msw@linux.com>
Cc: Keir Fraser <keir@xen.org>, Matt Wilson <msw@amazon.com>,
Matthew Rushton <mvrushton@gmail.com>,
Andrew Cooper <andrew.cooper3@citrix.com>,
Tim Deegan <tim@xen.org>, Jan Beulich <jbeulich@suse.com>,
xen-devel@lists.xenproject.org,
Malcolm Crossley <malcolm.crossley@citrix.com>
Subject: Re: [RFC PATCH] page_alloc: use first half of higher order chunks when halving
Date: Wed, 26 Mar 2014 10:44:18 +0000 [thread overview]
Message-ID: <5332AF82.2010506@citrix.com> (raw)
In-Reply-To: <20140326101746.GA14195@u109add4315675089e695.ant.amazon.com>
On 26/03/14 10:17, Matt Wilson wrote:
>
> Konrad, what's the possibility of fixing this in Linux Xen PV setup
> code? I think it'd be a matter batching up pages and doing larger
> order allocations in linux/arch/x86/xen/setup.c:xen_do_chunk(),
> falling back to smaller pages if allocations fail due to
> fragmentation, etc.
We plan to fix problems caused by non-machine-contiguous memory by
setting up the IOMMU to have 1:1 bus to pseudo-physical mappings. This
would avoid using the swiotlb always[1], regardless of the machine
layout of dom0 or the driver domain.
I think I would prefer this approach rather than making xen/setup.c even
more horribly complicated.
Malcolm has a working prototype of this already.
David
[1] Unless you have a non-64 bit DMA capable device, but we don't care
about performance with these.
next prev parent reply other threads:[~2014-03-26 10:44 UTC|newest]
Thread overview: 55+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-03-25 11:22 [RFC PATCH] page_alloc: use first half of higher order chunks when halving Matt Wilson
2014-03-25 11:44 ` Andrew Cooper
2014-03-25 13:20 ` Matt Wilson
2014-03-25 20:18 ` Matthew Rushton
2014-03-25 12:19 ` Tim Deegan
2014-03-25 13:27 ` Matt Wilson
2014-03-25 20:09 ` Matthew Rushton
2014-03-26 9:55 ` Tim Deegan
2014-03-26 10:17 ` Matt Wilson
2014-03-26 10:44 ` David Vrabel [this message]
2014-03-26 10:48 ` Matt Wilson
2014-03-26 11:13 ` Ian Campbell
2014-03-26 11:41 ` Matt Wilson
2014-03-26 11:45 ` Andrew Cooper
2014-03-26 11:50 ` Matt Wilson
2014-03-26 12:43 ` David Vrabel
2014-03-26 12:48 ` Matt Wilson
2014-03-26 15:08 ` Konrad Rzeszutek Wilk
2014-03-26 15:15 ` Matt Wilson
2014-03-26 15:59 ` Matthew Rushton
2014-03-26 16:36 ` Konrad Rzeszutek Wilk
2014-03-26 17:47 ` Matthew Rushton
2014-03-26 17:56 ` Konrad Rzeszutek Wilk
2014-03-26 22:15 ` Matthew Rushton
2014-03-28 17:02 ` Konrad Rzeszutek Wilk
2014-03-28 22:06 ` Matthew Rushton
2014-03-31 14:15 ` Konrad Rzeszutek Wilk
2014-04-01 3:25 ` Matthew Rushton
2014-04-01 10:48 ` Konrad Rzeszutek Wilk
2014-04-01 12:22 ` Tim Deegan
2014-04-02 0:17 ` Matthew Rushton
2014-04-02 7:52 ` Jan Beulich
2014-04-02 10:06 ` Ian Campbell
2014-04-02 10:15 ` Jan Beulich
2014-04-02 10:20 ` Ian Campbell
2014-04-09 22:21 ` Matthew Rushton
2014-04-10 6:14 ` Jan Beulich
2014-04-11 20:20 ` Matthew Rushton
2014-04-11 17:05 ` Konrad Rzeszutek Wilk
2014-04-11 20:28 ` Matthew Rushton
2014-04-12 1:34 ` Konrad Rzeszutek Wilk
2014-04-13 21:32 ` Tim Deegan
2014-04-14 8:51 ` Jan Beulich
2014-04-14 14:40 ` Konrad Rzeszutek Wilk
2014-04-14 15:34 ` Jan Beulich
2014-04-16 14:15 ` Konrad Rzeszutek Wilk
2014-04-17 1:34 ` Matthew Rushton
2014-05-07 23:16 ` Matthew Rushton
2014-05-08 18:05 ` Konrad Rzeszutek Wilk
2014-05-14 15:06 ` Konrad Rzeszutek Wilk
2014-05-20 19:26 ` Matthew Rushton
2014-05-23 19:00 ` Konrad Rzeszutek Wilk
2014-06-04 22:25 ` Matthew Rushton
2014-06-05 9:32 ` David Vrabel
2014-03-26 16:34 ` Konrad Rzeszutek Wilk
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