perf bench: Fix order of arguments to memcpy_alloc_mem
This was causing the destination instead of the source to be filled. As a result, the source was typically all mapped to one zero page, and hence very cacheable. Signed-off-by: Bruce Merry <bmerry@ska.ac.za> Acked-by: Ingo Molnar <mingo@kernel.org> Cc: Paul Mackerras <paulus@samba.org> Cc: Peter Zijlstra <peterz@infradead.org> Link: http://lkml.kernel.org/r/20150115092022.GA11292@krytonSigned-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
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