Messages in this thread |  | | Subject | Re: [PATCH v3 1/2] bpf: Adjust BPF stack helper functions to accommodate skip > 0 | From | patchwork-bot+netdevbpf@kernel ... | Date | Mon, 21 Mar 2022 02:30:10 +0000 |
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Hello:
This series was applied to bpf/bpf-next.git (master) by Alexei Starovoitov <ast@kernel.org>:
On Mon, 14 Mar 2022 11:20:41 -0700 you wrote: > Let's say that the caller has storage for num_elem stack frames. Then, > the BPF stack helper functions walk the stack for only num_elem frames. > This means that if skip > 0, one keeps only 'num_elem - skip' frames. > > This is because it sets init_nr in the perf_callchain_entry to the end > of the buffer to save num_elem entries only. I believe it was because > the perf callchain code unwound the stack frames until it reached the > global max size (sysctl_perf_event_max_stack). > > [...]
Here is the summary with links: - [v3,1/2] bpf: Adjust BPF stack helper functions to accommodate skip > 0 https://git.kernel.org/bpf/bpf-next/c/ee2a098851bf - [v3,2/2] bpf/selftests: Test skipping stacktrace https://git.kernel.org/bpf/bpf-next/c/e1cc1f39981b
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