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Dave Marchevsky says: ==================== This is a followup to discussion around RFC patchset "bpf: keep track of prog verification stats" [0]. The RFC elaborates on my usecase, but to summarize: keeping track of verifier stats for programs as they - and the kernels they run on - change over time can help developers of individual programs and BPF kernel folks. The RFC added a verif_stats to the uapi which contained most of the info which verifier prints currently. Feedback here was to avoid polluting uapi with stats that might be meaningless after major changes to the verifier, but that insn_processed or conceptually similar number would exist in the long term and was safe to expose. So let's expose just insn_processed via bpf_prog_info and fdinfo for now and explore good ways of getting more complicated stats in the future. [0] https://lore.kernel.org/bpf/20210920151112.3770991-1-davemarchevsky@fb.com/ v2->v3: * Remove unnecessary check in patch 2's test [Andrii] * Go back to adding new u32 in bpf_prog_info (vs using spare bits) [Andrii] * Rebase + add acks [Andrii, John] v1->v2: * Rename uapi field from insn_processed to verified_insns [Daniel] * use 31 bits of existing bitfield space in bpf_prog_info [Daniel] * change underlying type from 64-> 32 bits [Daniel] ==================== Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.