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| author | Andy Ayers <andya@microsoft.com> | 2020-05-27 02:26:53 +0300 |
|---|---|---|
| committer | GitHub <noreply@github.com> | 2020-05-27 02:26:53 +0300 |
| commit | f987b3bc8f8a4d49ca1fc8821a48a7614dfee7cd (patch) | |
| tree | d2e0998edf88d52f8e404626f95cef1593e4a581 /src/coreclr/clrdefinitions.cmake | |
| parent | e1c7d5f8838b8ebbe776dc586cd499c0761ffba9 (diff) | |
Simple sideloaded profile guided optimization support (#36887)
1. Add code so the runtime can read profile data from a text file and then
make this data available to the jit, so it will be easier to test the jit's
behavior when profile data is available.
2. Add code so the runtime can create profile text files by telling the jit
to insert probes into jitted code that write into a persistent buffer, which
is saved to text at shutdown. This is mainly intended to make creation of the
sideloaded profile data files easier, since their internal structure must
exactly match artifacts from jitted methods.
3. Add a mode where jit-instrumented Tier0 code can feed counts into Tier1
jitting. This is an experiment to see what benefit, if any, might accrue from
having profile data available for Tier1 jitting.
External format is text so it can be edited by hand or checked into the repo
alongside tests. Binary format would be more compact but opaque.
In all cases the jit internally sees a profile buffer identical to the one it
sees with IBC; the only minor changes in the jit are to initialize the count
field of each probe entry to zero and to only emit the entry helper call for
prejitted IBC.
Only root methods are instrumented, and only root method blocks are given
profile weights. Broadening to handle inlinees is future work, facilitated by
the new capabilites added here.
Diffstat (limited to 'src/coreclr/clrdefinitions.cmake')
| -rw-r--r-- | src/coreclr/clrdefinitions.cmake | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/src/coreclr/clrdefinitions.cmake b/src/coreclr/clrdefinitions.cmake index aa071ea69fe..469e0090271 100644 --- a/src/coreclr/clrdefinitions.cmake +++ b/src/coreclr/clrdefinitions.cmake @@ -195,6 +195,7 @@ add_compile_definitions($<$<NOT:$<BOOL:$<TARGET_PROPERTY:CROSSGEN_COMPONENT>>>:F if (CLR_CMAKE_TARGET_ARCH_AMD64) add_compile_definitions($<$<NOT:$<BOOL:$<TARGET_PROPERTY:CROSSGEN_COMPONENT>>>:FEATURE_ON_STACK_REPLACEMENT>) endif (CLR_CMAKE_TARGET_ARCH_AMD64) +add_compile_definitions($<$<NOT:$<BOOL:$<TARGET_PROPERTY:CROSSGEN_COMPONENT>>>:FEATURE_PGO>) if (CLR_CMAKE_TARGET_WIN32) add_definitions(-DFEATURE_TYPEEQUIVALENCE) endif(CLR_CMAKE_TARGET_WIN32) |