[PATCH] D20751: [esan] Add sideline itimer support

[Derek Bruening via llvm-commits]

bruening created this revision.
bruening added a reviewer: aizatsky.
bruening added subscribers: llvm-commits, eugenis, kcc, zhaoqin, vitalybuka.
Herald added a subscriber: kubabrecka.

Adds support for creating a separate thread for performing "sideline"
actions on a periodic basis via an itimer.  A new class SidelineThread
implements this feature, exposing a sampling callback to the caller.

Adds initial usage of sideline sampling to the working set tool.  For now
it simply prints the usage at each snapshot at verbosity level 1.  Adds a
test of this behavior.  Adds a new option -record_snapshots to control
whether we sample and a new option -sample_freq to control the periodicity
of the sampling.

http://reviews.llvm.org/D20751

Files:
  lib/esan/CMakeLists.txt
  lib/esan/esan_flags.inc
  lib/esan/esan_sideline.h
  lib/esan/esan_sideline_linux.cpp
  lib/esan/working_set.cpp
  test/esan/TestCases/workingset-samples.cpp
  test/esan/Unit/circular_buffer.cpp
  test/esan/lit.cfg

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