netdev - Re: [PATCH v3 1/2] bpf: Adjust BPF stack helper functions to accommodate skip

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Date:   Mon, 21 Mar 2022 02:30:10 +0000
From:   patchwork-bot+netdevbpf@...nel.org
To:     Namhyung Kim <namhyung@...nel.org>
Cc:     ast@...nel.org, daniel@...earbox.net, andrii@...nel.org,
        kafai@...com, songliubraving@...com, yhs@...com,
        john.fastabend@...il.com, kpsingh@...nel.org,
        netdev@...r.kernel.org, bpf@...r.kernel.org,
        linux-kernel@...r.kernel.org, acme@...nel.org,
        peterz@...radead.org, eugene.loh@...cle.com, haoluo@...gle.com
Subject: Re: [PATCH v3 1/2] bpf: Adjust BPF stack helper functions to accommodate
 skip > 0

Hello:

This series was applied to bpf/bpf-next.git (master)
by Alexei Starovoitov <ast@...nel.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

You are awesome, thank you!
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