netdev - Re: [PATCH v3 bpf-next 2/4] libbpf: auto-set PERF_EVENT

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Message-ID: <CAPhsuW71yTbuRc7d2wGRfddy42_0CREnNqJiqdMkTre8dC+u-Q@mail.gmail.com>
Date:   Sat, 29 Jun 2019 01:55:55 -0700
From:   Song Liu <liu.song.a23@...il.com>
To:     Andrii Nakryiko <andriin@...com>
Cc:     Andrii Nakryiko <andrii.nakryiko@...il.com>,
        Alexei Starovoitov <ast@...com>,
        Daniel Borkmann <daniel@...earbox.net>,
        bpf <bpf@...r.kernel.org>, Networking <netdev@...r.kernel.org>,
        Kernel Team <kernel-team@...com>,
        Song Liu <songliubraving@...com>
Subject: Re: [PATCH v3 bpf-next 2/4] libbpf: auto-set PERF_EVENT_ARRAY size to
 number of CPUs

On Fri, Jun 28, 2019 at 10:55 PM Andrii Nakryiko <andriin@...com> wrote:
>
> For BPF_MAP_TYPE_PERF_EVENT_ARRAY typically correct size is number of
> possible CPUs. This is impossible to specify at compilation time. This
> change adds automatic setting of PERF_EVENT_ARRAY size to number of
> system CPUs, unless non-zero size is specified explicitly. This allows
> to adjust size for advanced specific cases, while providing convenient
> and logical defaults.
>
> Signed-off-by: Andrii Nakryiko <andriin@...com>

Acked-by: Song Liu <songliubraving@...com>