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Revision tags: llvmorg-18.1.8, llvmorg-18.1.7, llvmorg-18.1.6, llvmorg-18.1.5, llvmorg-18.1.4, llvmorg-18.1.3, llvmorg-18.1.2, llvmorg-18.1.1, llvmorg-18.1.0, llvmorg-18.1.0-rc4, llvmorg-18.1.0-rc3, llvmorg-18.1.0-rc2, llvmorg-18.1.0-rc1, llvmorg-19-init, llvmorg-17.0.6, llvmorg-17.0.5, llvmorg-17.0.4, llvmorg-17.0.3, llvmorg-17.0.2, llvmorg-17.0.1, llvmorg-17.0.0, llvmorg-17.0.0-rc4, llvmorg-17.0.0-rc3, llvmorg-17.0.0-rc2, llvmorg-17.0.0-rc1, llvmorg-18-init |
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a3b9c153 |
| 20-Jun-2023 |
Kazu Hirata <kazu@google.com> |
[tools] Use llvm::is_contained (NFC)
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Revision tags: llvmorg-16.0.6, llvmorg-16.0.5, llvmorg-16.0.4, llvmorg-16.0.3, llvmorg-16.0.2, llvmorg-16.0.1, llvmorg-16.0.0, llvmorg-16.0.0-rc4, llvmorg-16.0.0-rc3, llvmorg-16.0.0-rc2, llvmorg-16.0.0-rc1, llvmorg-17-init, llvmorg-15.0.7 |
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09e79659 |
| 18-Dec-2022 |
David Blaikie <dblaikie@gmail.com> |
llvm-profgen: Fix use of stats to be under LLVM_ENABLE_STATS
This caused a -Wunused-variable warning in a without-assert+with-stats
build (because the stats were included but their use was not).
St
llvm-profgen: Fix use of stats to be under LLVM_ENABLE_STATS
This caused a -Wunused-variable warning in a without-assert+with-stats
build (because the stats were included but their use was not).
Stat use is meant to be gated by LLVM_ENABLE_STATS which can be set
independently of assertions.
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e2b9cd79 |
| 16-Dec-2022 |
Florian Hahn <flo@fhahn.com> |
[llvm-profgen] Fix build failure after 5d7950a403bec25e52.
This fixes a build failure with libc++
(`error: no matching function for call to 'max')`
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5d7950a4 |
| 16-Dec-2022 |
Hongtao Yu <hoy@fb.com> |
[CSSPGO][llvm-profgen] Missing frame inference.
This change introduces a missing frame inferrer aiming at fixing missing frames. It current only handles missing frames due to the compiler tail call
[CSSPGO][llvm-profgen] Missing frame inference.
This change introduces a missing frame inferrer aiming at fixing missing frames. It current only handles missing frames due to the compiler tail call elimination (TCE) but could also be extended to supporting other scenarios like frame pointer omission. When a tail called function is sampled, the caller frame will be missing from the call chain because the caller frame is reused for the callee frame. While TCE is beneficial to both perf and reducing stack overflow, a workaround being made in this change aims to find back the missing frames as much as possible.
The idea behind this work is to build a dynamic call graph that consists of only tail call edges constructed from LBR samples and DFS-search for a unique path for a given source frame and target frame on the graph. The unique path will be used to fill in the missing frames between the source and target. Note that only a unique path counts. Multiple paths are treated unreachable since we don't want to overcount for any particular possible path.
A switch --infer-missing-frame is introduced and defaults to be on.
Some testing results:
- 0.4% perf win according to three internal benchmarks.
- About 2/3 of the missing tail call frames can be recovered, according to an internal benchmark.
- 10% more profile generation time.
Reviewed By: wenlei
Differential Revision: https://reviews.llvm.org/D139367
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