[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] [PATCH] libxc: try to find last used pfn when migrating
On 27/11/15 14:50, Juergen Gross wrote: > For migration the last used pfn of a guest is needed to size the > logdirty bitmap and as an upper bound of the page loop. Unfortunately > there are pv-kernels advertising a much higher maximum pfn as they > are really using in order to support memory hotplug. This will lead > to allocation of much more memory in Xen tools during migration as > really needed. > > Try to find the last used guest pfn of a pv-domu by scanning the p2m > tree from the last entry towards it's start and search for an entry > not being invalid. > > Normally the mid pages of the p2m tree containing all invalid entries > are being reused, so we can just scan the top page for identical > entries and skip them but the first one. This has been fixed in Linux by "x86/xen/p2m: hint at the last populated P2M entry" 98dd166ea3a3c3b57919e20d9b0d1237fcd0349d which is tagged for stable. Do we really need a toolstack fix as well? David _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx http://lists.xen.org/xen-devel
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