netdev - Re: [PATCH bpf-next] bpf: allow bpf_perf_event_read

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Date:   Tue, 18 Feb 2020 16:09:27 +0100
From:   Daniel Borkmann <daniel@...earbox.net>
To:     Song Liu <songliubraving@...com>, netdev@...r.kernel.org,
        bpf@...r.kernel.org
Cc:     kernel-team@...com, ast@...nel.org, Yonghong Song <yhs@...com>
Subject: Re: [PATCH bpf-next] bpf: allow bpf_perf_event_read_value in all BPF
 programs

On 2/15/20 12:41 AM, Song Liu wrote:
> bpf_perf_event_read_value() is NMI safe. Enable it for all BPF programs.
> This can be used in fentry/fexit to profile BPF program and individual
> kernel function with hardware counters.
> 
> Cc: Yonghong Song <yhs@...com>
> Signed-off-by: Song Liu <songliubraving@...com>

And ironically, we had that already for perf_event_read. Applied, thanks!