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Subject[PATCH 0/2] perf: measure page fault duration in perf trace

Here are 2 small patches which try to fulfill a point in the perf todo

* Forward port the page fault tracepoints and use it in 'trace'.;a=commitdiff;h=d53b11976093b6d8afeb8181db53aaffc754920d;hp=32ba4abf60ae1b710d22a75725491815de649bc5

There are some questionable points:

* With luck I think I found the patch related with the todo item (the
link in the todo wiki page is broken); I hope I am not wrong...
* In the patch mentioned above, I found only changes related with
tracepoints creations and calls; the tracepoints were declared
generic (in include/trace/events/kmem.h) but were only called in x86
(arch/x86/mm/fault.c); as in x86, the tracepoint
"mm_pagefault_start" looks fairly like "page_fault_user" and
"page_fault_kernel", I decided to only create one x86-specific
tracepoint: "page_fault_exit"; maybe, you would prefer declaring
generic tracepoints;
* No option has been added for activating page-fault duration
calculation: if the needed tracepoints are available, durations will
be printed; maybe, that was not what you were looking for.

The patches were generated against tip/perf/core.


Alexis Berlemont (2):
perf, x86-mm: Add exit-fault tracing
perf: add page fault duration measures in perf trace

arch/x86/include/asm/trace/exceptions.h | 21 +++
arch/x86/mm/fault.c | 1 +
tools/perf/builtin-trace.c | 225 ++++++++++++++++++++++++++++----
3 files changed, 221 insertions(+), 26 deletions(-)


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