[RFC PATCH v3 0/2] tracing: add trace event for memory-failure

[Xie XiuQi <xiexiuqi@huawei.com>]

RAS user space tools like rasdaemon which base on trace event, could
receive mce error event, but no memory recovery result event. So, I
want to add this event to make this scenario complete.

This patch add a event at ras group for memory-failure.

The output like below:
#  tracer: nop
#
#  entries-in-buffer/entries-written: 2/2   #P:24
#
#                               _-----=> irqs-off
#                              / _----=> need-resched
#                             | / _---=> hardirq/softirq
#                             || / _--=> preempt-depth
#                             ||| /     delay
#            TASK-PID   CPU#  ||||    TIMESTAMP  FUNCTION
#               | |       |   ||||       |         |
       mce-inject-13150 [001] ....   277.019359: memory_failure_event: pfn 0x19869: recovery action for free buddy page: Delayed

--
v2->v3:
 - rebase on top of linux-next
 - based on Steven Rostedt's "tracing: Add TRACE_DEFINE_ENUM() macro
   to map enums to their values" patch set v1.

v1->v2:
 - Comment update
 - Just passing 'result' instead of 'action_name[result]',
   suggested by Steve. And hard coded there because trace-cmd
   and perf do not have a way to process enums.

Xie XiuQi (2):
  memory-failure: export page_type and action result
  tracing: add trace event for memory-failure

 include/linux/mm.h      |  34 ++++++++++
 include/ras/ras_event.h |  83 ++++++++++++++++++++++++
 kernel/trace/trace.c    |   2 +-
 mm/memory-failure.c     | 165 ++++++++++++++++++++----------------------------
 4 files changed, 185 insertions(+), 99 deletions(-)

-- 
1.8.3.1

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