[PATCH] D20578: [esan|wset] Iterate all memory to compute the total working set

[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 iteration of all application memory in an efficient manner using
shadow faults.  Shadow memory starts out inaccessible and we mark it
writable one page at a time on each fault when the instrumentation touches
it.  This allows iteration over just the mapped shadow memory, saving
significant time.

Adds a process-end iteration and pretty-printing of the final result.

Adds a new test and updates the existing tests.

http://reviews.llvm.org/D20578

Files:
  lib/esan/esan.cpp
  lib/esan/working_set.cpp
  lib/esan/working_set_posix.cpp
  test/esan/TestCases/workingset-fault.cpp
  test/esan/TestCases/workingset-memset.cpp
  test/esan/TestCases/workingset-simple.cpp

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