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Peter Lieven authored
virtually all dup pages are zero pages. remove the special is_dup_page() function and use the optimized buffer_find_nonzero_offset() function instead. here buffer_find_nonzero_offset() is used directly to avoid the unnecssary additional checks in buffer_is_zero(). raw performace gain checking 1 GByte zeroed memory over is_dup_page() is approx. 10-12% with SSE2 and 8-10% with unsigned long arithmedtic. Signed-off-by: Peter Lieven <pl@kamp.de> Reviewed-by: Orit Wasserman <owasserm@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Signed-off-by: Juan Quintela <quintela@redhat.com>
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