[patch 0/6] Notify page fault call chain

[Anil S Keshavamurthy]

Hi Andrew,

Currently in the do_page_fault() code path, we call notify_die(DIE_PAGE_FAULT, ...)
to notify the page fault. The only interested components for this page fault
notifications are Kprobes and/or kdb. Since notify_die() is highly overloaded,
this page fault notification is currently being sent to other components
registered with register_die_notification() which uses the same die_chain to loop
for all the registered components.

In order to optimize the do_page_fault() code path, this critical page fault notification
is now moved to different call chain and the test results showed great improvements.

Patches for i386, x86_64, ia64, powerpc and sparc64 follows this mail.

Please apply.

Thanks,
Anil Keshavamurthy

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