From: Jeremy Fitzhardinge <jeremy@goop.org>
To: Jan Beulich <jbeulich@novell.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>,
Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>,
the arch/x86 maintainers <x86@kernel.org>,
David Airlie <airlied@linux.ie>,
Xen-devel <xen-devel@lists.xensource.com>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: [Xen-devel] [PATCH 10/27] xen: make sure swiotlb allocation isphysically contigious
Date: Mon, 16 Mar 2009 12:37:05 -0700 [thread overview]
Message-ID: <49BEAA61.4020208@goop.org> (raw)
In-Reply-To: <49BE627E.76E4.0078.0@novell.com>
Jan Beulich wrote:
>
> While on native using alloc_bootmem_low_pages() is a requirement here,
> on Xen this should explicitly not be used, as we realized just a couple of
> days ago:
Which conversation was this?
> The way the bootmem allocator works, running out of space
> below 4Gb is pretty easy on machines with lots of memory, and since the
> swiotlb is a requirement for Dom0, the risk of allocation failures must be
> kept as low as possible.
>
Are we talking about a 32 or 64 bit dom0 here? If its 32-bit, then yes,
low memory is a precious resource, but I don't see why that depends on
the total amount of memory. And if its 64-bit, why is below-4G
particularly constrained? That would only matter for 32-bit devices?
J
next prev parent reply other threads:[~2009-03-16 19:37 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-03-13 16:59 [GIT PULL] Xen dom0 hardware access support Jeremy Fitzhardinge
2009-03-13 16:59 ` [PATCH 01/27] xen: Don't disable the I/O space Jeremy Fitzhardinge
2009-03-13 16:59 ` [PATCH 02/27] xen: Allow unprivileged Xen domains to create iomap pages Jeremy Fitzhardinge
2009-03-13 16:59 ` [PATCH 03/27] Xen: Rename the balloon lock Jeremy Fitzhardinge
2009-03-13 16:59 ` [PATCH 04/27] xen: Add xen_create_contiguous_region Jeremy Fitzhardinge
2009-03-13 16:59 ` [PATCH 05/27] x86/PCI: Clean up pci_cache_line_size Jeremy Fitzhardinge
2009-03-13 16:59 ` [PATCH 06/27] x86/PCI: Enable scanning of all pci functions Jeremy Fitzhardinge
2009-03-13 16:59 ` [PATCH 07/27] Xen/x86/PCI: Add support for the Xen PCI subsytem Jeremy Fitzhardinge
2009-03-13 16:59 ` [PATCH 08/27] x86/pci: make sure _PAGE_IOMAP it set on pci mappings Jeremy Fitzhardinge
2009-03-13 16:59 ` [PATCH 09/27] xen/pci: clean up Kconfig a bit Jeremy Fitzhardinge
2009-03-13 16:59 ` [PATCH 10/27] xen: make sure swiotlb allocation is physically contigious Jeremy Fitzhardinge
2009-03-16 13:30 ` [Xen-devel] [PATCH 10/27] xen: make sure swiotlb allocation isphysically contigious Jan Beulich
2009-03-16 19:37 ` Jeremy Fitzhardinge [this message]
2009-03-17 7:50 ` [Xen-devel] [PATCH 10/27] xen: make sure swiotlb allocationisphysically contigious Jan Beulich
2009-03-13 16:59 ` [PATCH 11/27] xen swiotlb: fixup swiotlb is chunks smaller than MAX_CONTIG_ORDER Jeremy Fitzhardinge
2009-03-13 16:59 ` [PATCH 12/27] xen: add hooks for mapping phys<->bus addresses in swiotlb Jeremy Fitzhardinge
2009-03-13 16:59 ` [PATCH 13/27] xen/swiotlb: add hook for swiotlb_arch_range_needs_mapping Jeremy Fitzhardinge
2009-03-13 16:59 ` [PATCH 14/27] xen: enable swiotlb for xen domain 0 Jeremy Fitzhardinge
2009-03-13 17:00 ` [PATCH 15/27] xen/swiotlb: use dma_alloc_from_coherent to get device coherent memory Jeremy Fitzhardinge
2009-03-13 17:00 ` [PATCH 16/27] swiotlb: use swiotlb_alloc_boot to allocate emergency pool Jeremy Fitzhardinge
2009-03-13 17:00 ` [PATCH 17/27] xen/swiotlb: improve comment on gfp flags in xen_alloc_coherent() Jeremy Fitzhardinge
2009-03-13 17:00 ` [PATCH 18/27] xen/swiotlb: add sync functions Jeremy Fitzhardinge
2009-03-13 17:00 ` [PATCH 19/27] xen: set callout_map to make mtrr work Jeremy Fitzhardinge
2009-03-13 17:00 ` [PATCH 20/27] xen mtrr: Use specific cpu_has_foo macros instead of generic cpu_has() Jeremy Fitzhardinge
2009-03-13 17:00 ` [PATCH 21/27] xen mtrr: Use generic_validate_add_page() Jeremy Fitzhardinge
2009-03-13 17:00 ` [PATCH 22/27] xen mtrr: Implement xen_get_free_region() Jeremy Fitzhardinge
2009-03-13 17:00 ` [PATCH 23/27] xen mtrr: Add xen_{get,set}_mtrr() implementations Jeremy Fitzhardinge
2009-03-13 17:00 ` [PATCH 24/27] xen mtrr: Kill some unneccessary includes Jeremy Fitzhardinge
2009-03-13 17:00 ` [PATCH 25/27] x86: define arch_vm_get_page_prot to set _PAGE_IOMAP on VM_IO vmas Jeremy Fitzhardinge
2009-03-13 17:00 ` [PATCH 26/27] agp: use more dma-ops-like operations for agp memory Jeremy Fitzhardinge
2009-03-30 21:13 ` Dave Airlie
2009-03-13 17:00 ` [PATCH 27/27] agp/intel: use dma_alloc_coherent for special cursor memory Jeremy Fitzhardinge
2009-03-30 21:12 ` Dave Airlie
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