This patch enables controlling kernel profiling through proc/sysctl inferface.

With this patch profiling will be available without rebooting the
machine (especially for
production servers) with some drawbacks of vmalloc(tlb). So, bootime
algorithm part is left unchanged for anyone who wishes to use
profiling as usual without tlb drawback by rebooting the machine.


PS. This patch is against  2.6.12-rc6