[(resend)patch 0/7] Notify page fault call chain

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_notifier()  
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 conducted
by Robin Holt showed great improvements.

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

Please apply.

Thanks,
Anil Keshavamurthy

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• Follow-Ups:
  • Re: [(resend)patch 0/7] Notify page fault call chain
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  • [(resend)patch 5/7] Notify page fault call chain for sparc64
    • From: Anil S Keshavamurthy <[email protected]>
  • [(resend)patch 7/7] Kprobes - Register for page fault notify on active probes
    • From: Anil S Keshavamurthy <[email protected]>
  • [(resend)patch 1/7] Notify page fault call chain for i386
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  • [(resend)patch 3/7] Notify page fault call chain for ia64
    • From: Anil S Keshavamurthy <[email protected]>
  • [(resend)patch 6/7] Kprobes registers for notify page fault
    • From: Anil S Keshavamurthy <[email protected]>
  • [(resend)patch 2/7] Notify page fault call chain for x86_64
    • From: Anil S Keshavamurthy <[email protected]>

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