netdev - Re: [DRAFT PATCH] random32: make prandom

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Message-ID: <CANn89i+Yp7duamws_yH6KdFJjiUrH_aGxVf7ANPo8DEmib8Cbw@mail.gmail.com>
Date:   Thu, 13 Aug 2020 07:00:41 -0700
From:   Eric Dumazet <edumazet@...gle.com>
To:     sedat.dilek@...il.com
Cc:     George Spelvin <lkml@....org>, Amit Klein <aksecurity@...il.com>,
        "Jason A. Donenfeld" <Jason@...c4.com>,
        Andy Lutomirski <luto@...nel.org>,
        Kees Cook <keescook@...omium.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Peter Zijlstra <peterz@...radead.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        netdev <netdev@...r.kernel.org>, Willy Tarreau <w@....eu>
Subject: Re: [DRAFT PATCH] random32: make prandom_u32() output unpredictable

On Thu, Aug 13, 2020 at 1:27 AM Sedat Dilek <sedat.dilek@...il.com> wrote:
>
> I run a perf session looks like this in my KDE/Plasma desktop-environment:
>
> [ PERF SESSION ]
>
>  1016  2020-08-13 09:57:24 echo 1 > /proc/sys/kernel/sched_schedstats
>  1017  2020-08-13 09:57:24 echo prandom_u32 >>
> /sys/kernel/debug/tracing/set_event
>  1018  2020-08-13 09:57:24 echo traceon >
> /sys/kernel/debug/tracing/events/random/prandom_u32/trigger
>  1019  2020-08-13 09:57:25 echo 1 > /sys/kernel/debug/tracing/events/enable
>
>  1020  2020-08-13 09:57:32 sysctl -n kernel.sched_schedstats
>  1021  2020-08-13 09:57:32 cat /sys/kernel/debug/tracing/events/enable
>  1022  2020-08-13 09:57:32 grep prandom_u32 /sys/kernel/debug/tracing/set_event
>  1023  2020-08-13 09:57:33 cat
> /sys/kernel/debug/tracing/events/random/prandom_u32/trigger
>
> root# /home/dileks/bin/perf record -a -g -e random:prandom_u32 sleep 5
>

To be clear : This "perf record -a -g -e random:prandom_u32 sleep 5"
is self sufficient.

You have nothing to do before (as reported in your email), this is
simply not needed.

I am not sure why you added all this irrelevant stuff, this is distracting.