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| author |   Yonghong Song <yhs@fb.com> | 2019-10-21 21:31:19 -0700 |
|---|---|---|
| committer |   Daniel Borkmann <daniel@iogearbox.net> | 2019-10-22 21:13:39 +0200 |
| commit | e13a2fe642bd4a42c2b468cdb25ad3aab933d572 (patch) | |
| tree | 4bbecfc207dfe37a1d5afebb2ee282e9ef654c50 /tools/perf/scripts/python/export-to-postgresql.py | |
| parent | Merge branch 'bpf-libbpf-cleanups' (diff) | |
| download | linux-dev-e13a2fe642bd4a42c2b468cdb25ad3aab933d572.tar.xz linux-dev-e13a2fe642bd4a42c2b468cdb25ad3aab933d572.zip | |
tools/bpf: Turn on llvm alu32 attribute by default
LLVM alu32 was introduced in LLVM7:
https://reviews.llvm.org/rL325987
https://reviews.llvm.org/rL325989
Experiments showed that in general performance is better with alu32
enabled:
https://lwn.net/Articles/775316/
This patch turns on alu32 with no-flavor test_progs which is tested
most often. The flavor test at no_alu32/test_progs can be used to
test without alu32 enabled. The Makefile check for whether LLVM
supports '-mattr=+alu32 -mcpu=v3' is removed as LLVM7 should be
available for recent distributions and also latest LLVM is preferred
to run BPF selftests.
Note that jmp32 is checked by -mcpu=probe and will be enabled if the
host kernel supports it.
Signed-off-by: Yonghong Song <yhs@fb.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Andrii Nakryiko <andriin@fb.com>
Link: https://lore.kernel.org/bpf/20191022043119.2625263-1-yhs@fb.com
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