[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] [PATCH 1/2] tmem: add full support for x86 up to 16Tb
On Mon, 2013-09-23 at 10:36 +0100, Andrew Cooper wrote: > On 23/09/13 03:23, Bob Liu wrote: > > tmem used to have code assuming to be able to directly access all memory. > > This patch try to fix this problem fully so that tmem can work on x86 up to > > 16Tb. > > > > tmem allocates pages mainly for two purposes. > > 1. store pages passed from guests through the frontswap/cleancache frontend. > > In this case tmem code has already using map_domain_page() before > > accessing the memory, no need to change for 16Tb supporting. > > > > 2. store tmem meta data. > > In this case, there is a problem if we use map_domain_page(). That's the > > mapping > > entrys are limited, in the 2 VCPU guest we only have 32 entries and tmem > > can't > > call unmap in a short time. > > The fixing is allocate xen heap pages instead of domain heap for tmem meta > > data. > > This is a no go. > > Xenheap pages just as limited as domain mapping slots (and perhaps moreso). > > All Xenheap pages live inside the Xen mapped region, including in the > upper virtual region of 32bit PV guests. Not on a 64-bit hypervisor, which is all we support these days... (32-bit ARM doesn't have the same limitations as 32-bit x86 did) Ian. _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx http://lists.xen.org/xen-devel
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