netdev - Re: [PATCH v2 bpf-next 0/3] libbpf: add perf buffer abstraction and API

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Message-ID: <877e98d0hp.fsf@toke.dk>
Date:   Wed, 26 Jun 2019 13:55:46 +0200
From:   Toke Høiland-Jørgensen <toke@...hat.com>
To:     Andrii Nakryiko <andriin@...com>, andrii.nakryiko@...il.com,
        ast@...com, daniel@...earbox.net, bpf@...r.kernel.org,
        netdev@...r.kernel.org, kernel-team@...com
Cc:     Andrii Nakryiko <andriin@...com>
Subject: Re: [PATCH v2 bpf-next 0/3] libbpf: add perf buffer abstraction and API

Andrii Nakryiko <andriin@...com> writes:

> This patchset adds a high-level API for setting up and polling perf buffers
> associated with BPF_MAP_TYPE_PERF_EVENT_ARRAY map. Details of APIs are
> described in corresponding commit.
>
> Patch #1 adds a set of APIs to set up and work with perf buffer.
> Patch #2 enhances libbpf to supprot auto-setting PERF_EVENT_ARRAY map size.
> Patch #3 adds test.

Having this in libbpf is great! Do you have a usage example of how a
program is supposed to read events from the buffer? This is something we
would probably want to add to the XDP tutorial

-Toke