netdev - Re: [PATCH bpf-next 0/4] Fix perf_buffer creation on systems with offline CPUs

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Date:   Fri, 13 Dec 2019 13:04:08 -0800
From:   Alexei Starovoitov <alexei.starovoitov@...il.com>
To:     Andrii Nakryiko <andriin@...com>
Cc:     bpf <bpf@...r.kernel.org>,
        Network Development <netdev@...r.kernel.org>,
        Alexei Starovoitov <ast@...com>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii.nakryiko@...il.com>,
        Kernel Team <kernel-team@...com>
Subject: Re: [PATCH bpf-next 0/4] Fix perf_buffer creation on systems with
 offline CPUs

On Wed, Dec 11, 2019 at 5:35 PM Andrii Nakryiko <andriin@...com> wrote:
>
> This patch set fixes perf_buffer__new() behavior on systems which have some of
> the CPUs offline/missing (due to difference between "possible" and "online"
> sets). perf_buffer will create per-CPU buffer and open/attach to corresponding
> perf_event only on CPUs present and online at the moment of perf_buffer
> creation. Without this logic, perf_buffer creation has no chances of
> succeeding on such systems, preventing valid and correct BPF applications from
> starting.

Applied. Thanks