[PATCH V3 0/9] perf: Intel uncore pmu counting support

[Yan, Zheng]

Hi, all

Here is the V3 patches to add uncore counting support for Nehalem,
Sandy Bridge and Sandy Bridge-EP, applied on top of current tip.
The code is based on Lin Ming's old patches.

For Nehalem and Sandy Bridge-EP, A few general events are exported
under directory:
  /sys/bus/event_source/devices/${uncore_dev}/events/

Each file in the events directory defines an event. The content is
like:
  config=1,config1=2

You can use 'perf stat' to access to the uncore pmu. For example:
  perf stat -a -C 0 -e 'uncore_imc0/CAS_COUNT_RD/' sleep 1

Any comment is appreciated.
Thank you
---
Changes since v1:
 - Modify perf tool to parse events from sysfs
 - A few minor code cleanup

Changes since v2:
 - Place all events for a particular socket onto a single cpu
 - Make the events parser in perf tool reentrantable
 - A few code cleanup

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