Add USDT probe publishing ABI offsets for external profilers.#260
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gnurizen wants to merge 1 commit into
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Add USDT probe publishing ABI offsets for external profilers.#260gnurizen wants to merge 1 commit into
gnurizen wants to merge 1 commit into
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STAP_PROBE4 in lj_state_newstate emits offsetof(global_State, cur_L), GG_G2DISP, GG_G2J + offsetof(jit_State, trace), and CFRAME_SIZE_JIT in .note.stapsdt. Profilers read these statically instead of disassembling lj_dispatch_update et al. Enable with `make XCFLAGS=-DLUAJIT_USE_SDT`. Off by default; gated on LJ_HASJIT.
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STAP_PROBE4 in lj_state_newstate emits offsetof(global_State, cur_L),
GG_G2DISP, GG_G2J + offsetof(jit_State, trace), and CFRAME_SIZE_JIT
in .note.stapsdt. Profilers read these statically instead of
disassembling lj_dispatch_update et al.
Enable with
make XCFLAGS=-DLUAJIT_USE_SDT. Off by default; gatedon LJ_HASJIT.