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Re: [Xen-merge] arch/i386/mach-xen/mm/highmem.c indentical

>  2. queue_l1_update. This is best used for singleton updates. The
> 'queue' in the name is a bit of a misnomer as we now no longer ever
> queue things because: (a) working out where to put the flushes to avoid
> read-after-write hazards on pending updates is hard, and  (b) its
> impossible to make SMP guests work with good perofrmance. [This is one

Can you explain the SMP guest problem in more detail?

-And

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