Revert duplicated perf commit.

This reverts commit 2431496fbdd142ccc83138d94f3f510a36ce9270 as it was
applied incorrectly twice.

Thanks to Jiri for pointing this out.

Cc: Jiri Slaby <jslaby@suse.cz>
Cc: Andrew Vagin <avagin@openvz.org>
Cc: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>