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On 32-bit Linux systems use vmem_size() to correctly size the ARC and better determine when IO should be throttle due to low memory. On 64-bit systems this change has no effect since the virtual address space available far exceeds the physical memory available. Reviewed-by: Tom Caputi <tcaputi@datto.com> Reviewed-by: Tim Chase <tim@chase2k.com> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Issue #5347