linux-kernel - [PATCH 0/2] perf: measure page fault duration in perf trace

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Date:   Wed, 26 Oct 2016 01:51:58 +0200
From:   Alexis Berlemont <alexis.berlemont@...il.com>
To:     linux-kernel@...r.kernel.org
Cc:     Alexis Berlemont <alexis.berlemont@...il.com>,
        peterz@...radead.org, mingo@...hat.com, acme@...nel.org,
        alexander.shishkin@...ux.intel.com
Subject: [PATCH 0/2] perf: measure page fault duration in perf trace

Hi,

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

* Forward port the page fault tracepoints and use it in 'trace'.
http://git.kernel.org/?p=linux/kernel/git/acme/linux.git;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.

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(-)

-- 
2.10.1