tree 133e7788eb885d11cecc0590184f8825f4c0836f
parent ac7956e2699380b8b10146ec2ba8cbe43a03ff7a
author Seiji Aguchi <seiji.aguchi@hds.com> 1383165543 -0400
committer H. Peter Anvin <hpa@linux.intel.com> 1383948949 -0800

x86, trace: Add page fault tracepoints

This patch introduces page fault tracepoints to x86 architecture
by switching IDT.

  Two events, for user and kernel spaces, are introduced at the beginning
  of page fault handler for tracing.

  - User space event
    There is a request of page fault event for user space as below.

    https://lkml.kernel.org/r/1368079520-11015-2-git-send-email-fdeslaur+()+gmail+!+com
    https://lkml.kernel.org/r/1368079520-11015-1-git-send-email-fdeslaur+()+gmail+!+com

  - Kernel space event:
    When we measure an overhead in kernel space for investigating performance
    issues, we can check if it comes from the page fault events.

Signed-off-by: Seiji Aguchi <seiji.aguchi@hds.com>
Link: http://lkml.kernel.org/r/52716E67.6090705@hds.com
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>