netdev - Re: [PATCH bpf-next v7 2/2] selftests/bpf: Selftest for real time helper

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Date:   Wed, 7 Oct 2020 09:33:26 -0700
From:   David Ahern <dsahern@...il.com>
To:     Maciej Żenczykowski <maze@...gle.com>,
        Alexei Starovoitov <alexei.starovoitov@...il.com>
Cc:     "Pujari, Bimmy" <bimmy.pujari@...el.com>,
        "bpf@...r.kernel.org" <bpf@...r.kernel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "mchehab@...nel.org" <mchehab@...nel.org>,
        "ast@...nel.org" <ast@...nel.org>,
        "daniel@...earbox.net" <daniel@...earbox.net>,
        "kafai@...com" <kafai@...com>,
        "Nikravesh, Ashkan" <ashkan.nikravesh@...el.com>,
        "Alvarez, Daniel A" <daniel.a.alvarez@...el.com>
Subject: Re: [PATCH bpf-next v7 2/2] selftests/bpf: Selftest for real time
 helper

On 10/5/20 10:36 AM, Maciej Żenczykowski wrote:
>> Don't bother. This helper is no go.
> 
> I disagree on the 'no go' -- I do think we should have this helper.

+1

> 
> Lets not make bpf even harder to use then it already is...
> 

Logging is done using time of day; that is not a posix mistake but a
real need. Users do not file complaints based on a server's boot time or
some random monotonic time; they report a problem based on time-of-day.
Allowing bpf programs to timeofday makes it easier to troubleshoot and
correlate kernel side events to userspace logs.