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brendangregg / bpf-perf-tools-book

Official repository for the BPF Performance Tools book
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blostacks.bt kprobe:blk_start_request #6

Closed brendangregg closed 5 years ago

brendangregg commented 5 years ago

This function was removed in 5.0 (as 5.0 went multi-queue only).

Warning: could not attach probe kprobe:blk_start_request, skipping.

The tool works anyway, since it traces both old and new functions. It just prints a warning on 5.0+, which is ok. I'm going to assume that this behavior -- printing a warning -- is not going to change, and document it as such.

brendangregg commented 5 years ago

I added a note about this in the book.