[PATCH v2 0/2]: Documentation/admin-guide: introduce perf-security.rst file and extend perf_event_paranoid documentation

To facilitate informed decision making by system administrators [1]
to permit and manage access to Perf Events (PE) / Perf tool (Perf) [2],[3] 
performance monitoring for multiple users perf-security.rst document 
suggested by Thomas Gleixner is introduced [4] that:

a) states PE/Perf access security concerns for multi user environment
b) refers to base Linux access control and management principles
c) extends documentation of possible perf_event_paranoid knob settings 

The file serves as single knowledge source for PE/Perf security and 
access control related matter according to decisions, discussion and  
PoC prototype previously made here [5],[6].

The file can later be extended with information describing:

a) PE/Perf usage models and its security implications
b) PE/Perf user interface, its changes and related security implications
c) security related implications of monitoring by a specific PE PMU [2]

---
Alexey Budankov (2):
  Documentation/admin-guide: introduce perf-security.rst file
  Documentation/admin-guide: update admin-guide index.rst

 Documentation/admin-guide/index.rst         |  1 +
 Documentation/admin-guide/perf-security.rst | 76 +++++++++++++++++++++
 2 files changed, 77 insertions(+)
 create mode 100644 Documentation/admin-guide/perf-security.rst

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Changes in v2:
- reverted patches order in the set to avoid CI issue
- replaced old PCL referencing by PE (Perf Events)
- skipped >=3 setting documentation at the moment

---
[1] https://marc.info/?l=linux-kernel&m=153815883923913&...
[2] http://man7.org/linux/man-pages/man2/perf_event_open.2.html
[3] https://perf.wiki.kernel.org/index.php/Main_Page
[4] https://marc.info/?l=linux-kernel&m=153837512226838&...
[5] https://marc.info/?l=linux-kernel&m=153736008310781&...
[6] https://lkml.org/lkml/2018/5/21/156