Chandler Carruth ae1954050c Add time getters to the process interface for requesting the elapsed ... wall time, user time, and system time since a process started. For walltime, we currently use TimeValue's interface and a global initializer to compute a close approximation of total process runtime. For user time, this adds support for an somewhat more precise timing mechanism -- clock_gettime with the CLOCK_PROCESS_CPUTIME_ID clock selected. For system time, we have to do a full getrusage call to extract the system time from the OS. This is expensive but unavoidable. In passing, clean up the implementation of the old APIs and fix some latent bugs in the Windows code. This might have manifested on Windows ARM systems or other systems with strange 64-bit integer behavior. The old API for this both user time and system time simultaneously from a single getrusage call. While this results in fewer system calls, it also results in a lower precision user time and if only user time is desired, it introduces a higher overhead. It may be worthwhile to switch some of the pass timers to not track system time and directly track user and wall time. The old API also tracked walltime in a confusing way -- it just set it to the current walltime rather than providing any measure of wall time since the process started the way buth user and system time are tracked. The new API is more consistent here. The plan is to eventually implement these methods for a *child* process by using the wait3(2) system call to populate an rusage struct representing the whole subprocess execution. That way, after waiting on a child process its stats will become accurate and cheap to query. llvm-svn: 171551		2013-01-04 23:19:55 +00:00
..
AlignOfTest.cpp	[AlignOf] Add AlignedCharArray and refactor AlignedCharArrayUnion.	2012-12-31 19:54:45 +00:00
AllocatorTest.cpp	Sort the #include lines for unittest/...	2012-12-04 10:23:08 +00:00
BlockFrequencyTest.cpp	Sort the #include lines for unittest/...	2012-12-04 10:23:08 +00:00
Casting.cpp	Sort the #include lines for unittest/...	2012-12-04 10:23:08 +00:00
CMakeLists.txt	Begin sketching out the process interface.	2012-12-31 11:17:50 +00:00
CommandLineTest.cpp	Sort the #include lines for unittest/...	2012-12-04 10:23:08 +00:00
ConstantRangeTest.cpp	Move all of the header files which are involved in modelling the LLVM IR	2013-01-02 11:36:10 +00:00
DataExtractorTest.cpp	DataExtractor: Fix integer truncation issues in LEB128 extraction.	2012-08-20 10:52:11 +00:00
EndianTest.cpp	[Support][Endian] Add support for specifying the alignment and native unaligned types.	2013-01-02 20:14:11 +00:00
FileOutputBufferTest.cpp	Sort the #include lines for unittest/...	2012-12-04 10:23:08 +00:00
formatted_raw_ostream_test.cpp	Sort the #include lines for unittest/...	2012-12-04 10:23:08 +00:00
IntegersSubsetTest.cpp	Sort the #include lines for unittest/...	2012-12-04 10:23:08 +00:00
LeakDetectorTest.cpp
Makefile
ManagedStatic.cpp	Sort the #include lines for unittest/...	2012-12-04 10:23:08 +00:00
MathExtrasTest.cpp
MemoryBufferTest.cpp	Sort the #include lines for unittest/...	2012-12-04 10:23:08 +00:00
MemoryTest.cpp	Go ahead and get rid of the old page size interface and convert all the	2012-12-31 23:31:56 +00:00
Path.cpp	Sort the #include lines for unittest/...	2012-12-04 10:23:08 +00:00
ProcessTest.cpp	Add time getters to the process interface for requesting the elapsed	2013-01-04 23:19:55 +00:00
raw_ostream_test.cpp
RegexTest.cpp	Sort the #include lines for unittest/...	2012-12-04 10:23:08 +00:00
SwapByteOrderTest.cpp
TimeValue.cpp
ValueHandleTest.cpp	Move all of the header files which are involved in modelling the LLVM IR	2013-01-02 11:36:10 +00:00
YAMLIOTest.cpp	Fix how YAML I/O detects flow sequences.	2013-01-04 19:32:00 +00:00
YAMLParserTest.cpp	Allow using MemoryBuffers with yaml::Stream directly.	2012-11-19 23:21:47 +00:00