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xen-devel
Re: [Xen-devel] [PATCH 10/27] xen: make sure swiotlb allocation isphysi
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
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- [Xen-devel] [GIT PULL] Xen dom0 hardware access support, Jeremy Fitzhardinge
- [Xen-devel] [PATCH 12/27] xen: add hooks for mapping phys<->bus addresses in swiotlb, Jeremy Fitzhardinge
- [Xen-devel] [PATCH 11/27] xen swiotlb: fixup swiotlb is chunks smaller than MAX_CONTIG_ORDER, Jeremy Fitzhardinge
- [Xen-devel] [PATCH 16/27] swiotlb: use swiotlb_alloc_boot to allocate emergency pool, Jeremy Fitzhardinge
- [Xen-devel] [PATCH 14/27] xen: enable swiotlb for xen domain 0., Jeremy Fitzhardinge
- [Xen-devel] [PATCH 17/27] xen/swiotlb: improve comment on gfp flags in xen_alloc_coherent(), Jeremy Fitzhardinge
- [Xen-devel] [PATCH 07/27] Xen/x86/PCI: Add support for the Xen PCI subsytem, Jeremy Fitzhardinge
- [Xen-devel] [PATCH 19/27] xen: set callout_map to make mtrr work, Jeremy Fitzhardinge
- [Xen-devel] [PATCH 18/27] xen/swiotlb: add sync functions, Jeremy Fitzhardinge
- [Xen-devel] [PATCH 15/27] xen/swiotlb: use dma_alloc_from_coherent to get device coherent memory, Jeremy Fitzhardinge
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