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This change makes it so that the profiling mode implementation will only
write files when there are buffers to write. Before this change, we'd
always open a file even if there were no profiles collected when
flushing.
git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@337443 91177308-0d34-0410-b5e6-96231b3b80d8
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Summary:
This change adds support for writing out profiles at program exit.
Depends on D48653.
Reviewers: kpw, eizan
Reviewed By: kpw
Subscribers: llvm-commits
Differential Revision: https://reviews.llvm.org/D48956
git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@336969 91177308-0d34-0410-b5e6-96231b3b80d8
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This constrains the build environments we are testing/supporting for the runtime
tests until we can be sure xray works in more platforms.
git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@336878 91177308-0d34-0410-b5e6-96231b3b80d8
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Summary: `rm -f` does not write diagnostic message when there is no file argument.
Reviewers: dberris
Subscribers: delcypher, llvm-commits, #sanitizers
Differential Revision: https://reviews.llvm.org/D48311
git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@335025 91177308-0d34-0410-b5e6-96231b3b80d8
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Summary:
This is part of the larger XRay Profiling Mode effort.
This patch implements the profile writing mechanism, to allow profiles
collected through the profiler mode to be persisted to files.
Follow-on patches would allow us to load these profiles and start
converting/analysing them through the `llvm-xray` tool.
Depends on D44620.
Reviewers: echristo, kpw, pelikan
Reviewed By: kpw
Subscribers: llvm-commits
Differential Revision: https://reviews.llvm.org/D45998
git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@334472 91177308-0d34-0410-b5e6-96231b3b80d8
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Summary:
This is part of the larger XRay Profiling Mode effort.
This patch implements the wiring required to enable us to actually
select the `xray-profiling` mode, and install the handlers to start
measuring the time and frequency of the function calls in call stacks.
The current way to get the profile information is by working with the
XRay API to `__xray_process_buffers(...)`.
In subsequent changes we'll implement profile saving to files, similar
to how the FDR and basic modes operate, as well as means for converting
this format into those that can be loaded/visualised as flame graphs. We
will also be extending the accounting tool in LLVM to support
stack-based function call accounting.
We also continue with the implementation to support building small
histograms of latencies for the `FunctionCallTrie::Node` type, to allow
us to actually approximate the distribution of latencies per function.
Depends on D45758 and D46998.
Reviewers: eizan, kpw, pelikan
Reviewed By: kpw
Subscribers: llvm-commits, mgorny
Differential Revision: https://reviews.llvm.org/D44620
git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@334469 91177308-0d34-0410-b5e6-96231b3b80d8
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