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This bug has been copied from bug #641315 and has been proposed to be backported to 6.0 z-stream (EUS).
An advisory has been issued which should help the problem described in this bug report. This report is therefore being closed with a resolution of ERRATA. For more information on therefore solution and/or where to find the updated files, please follow the link below. You may reopen this bug report if the solution does not work for you. http://rhn.redhat.com/errata/RHSA-2011-0421.html
Technical note added. If any revisions are required, please edit the "Technical Notes" field accordingly. All revisions will be proofread by the Engineering Content Services team. New Contents: Reading the /proc/vmcore file on a Red Hat Enterprise Linux 6 system was not optimal because it did not always take advantage of reading through the cached memory. With this update, access to the /dev/oldmem device in the /proc/vmcore file is cached, resulting in faster copying to user space.