libbpf-tools: Allow tools to run on old kernels #4546
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Fallback to use kprobes if kernel lacks support for fentry/fexit. Signed-off-by: mickey_zhu <mickey_zhu@realsil.com.cn>
michael-chuh
requested review from
drzaeus77,
goldshtn,
yonghong-song,
4ast,
brendangregg and
davemarchevsky
as code owners
chenhengqi
reviewed
Apr 4, 2023
Comment on lines
+70
to
+71
| static __always_inline | ||
| int trace_done(void *ctx, struct request *rq) |
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Keep this in single line. We don't need __always_inline here.
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| SEC("fexit/__page_cache_alloc") | ||
| int BPF_PROG(page_cache_alloc_ret, gfp_t gfp, struct page *ret) | ||
| static __always_inline |
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Close this in favor of new ones. |
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Add more tools to fallback to use kprobes if kernel lacks support for fentry/fexit,
discussion is on #4231