47a00e599b
Versions of pahole from 1.22 support multi-threaded operation with separate CUs being processed independently. This results in non-deterministic and effectively non-reproducible output for kernel objects. Later versions of pahole aim to support determinism by retiring CUs in order. We regain determinism by restricting parallelism to 1 at the cost of some performance. The default parallelism of `pahole -J` is the number of online processors * 1.1. Experiments on a workstation with 36 cores reveal that performance is actually worse for `vmlinux` at `-j` (8.9s) than at `-j3` (7.8s) and the optimum is around `-j9` (4.9s). No parallelism is slowest (18.8s), but still acceptable for GKI. Bug: 342094847 Change-Id: Ibd72ac638faa1826f6655b336cc7001591ea70f1 Signed-off-by: Giuliano Procida <gprocida@google.com>
31 lines
856 B
Bash
Executable File
31 lines
856 B
Bash
Executable File
#!/bin/sh
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# SPDX-License-Identifier: GPL-2.0
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extra_paholeopt=
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if ! [ -x "$(command -v ${PAHOLE})" ]; then
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exit 0
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fi
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pahole_ver=$($(dirname $0)/pahole-version.sh ${PAHOLE})
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if [ "${pahole_ver}" -ge "118" ] && [ "${pahole_ver}" -le "121" ]; then
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# pahole 1.18 through 1.21 can't handle zero-sized per-CPU vars
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extra_paholeopt="${extra_paholeopt} --skip_encoding_btf_vars"
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fi
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if [ "${pahole_ver}" -ge "121" ]; then
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extra_paholeopt="${extra_paholeopt} --btf_gen_floats"
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fi
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if [ "${pahole_ver}" -ge "122" ]; then
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extra_paholeopt="${extra_paholeopt} -j1"
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fi
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if [ "${pahole_ver}" -ge "124" ]; then
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# see PAHOLE_HAS_LANG_EXCLUDE
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extra_paholeopt="${extra_paholeopt} --lang_exclude=rust"
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fi
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if [ "${pahole_ver}" -ge "125" ]; then
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extra_paholeopt="${extra_paholeopt} --skip_encoding_btf_inconsistent_proto --btf_gen_optimized"
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fi
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echo ${extra_paholeopt}
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