linux-kernel - Re: [PATCH 5/5] selftest/seccomp: add a new test for the sync mode of seccomp_user

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Date:   Thu, 20 Oct 2022 17:53:47 -0700
From:   Andrei Vagin <avagin@...il.com>
To:     Kees Cook <kees@...nel.org>
Cc:     linux-kernel@...r.kernel.org,
        Andy Lutomirski <luto@...capital.net>,
        Christian Brauner <brauner@...nel.org>,
        Dietmar Eggemann <dietmar.eggemann@....com>,
        Kees Cook <keescook@...omium.org>,
        Ingo Molnar <mingo@...hat.com>,
        Juri Lelli <juri.lelli@...hat.com>,
        Peter Oskolkov <posk@...gle.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Tycho Andersen <tycho@...ho.pizza>,
        Will Drewry <wad@...omium.org>,
        Vincent Guittot <vincent.guittot@...aro.org>
Subject: Re: [PATCH 5/5] selftest/seccomp: add a new test for the sync mode
 of seccomp_user_notify

On Wed, Oct 19, 2022 at 10:04:44PM -0700, Kees Cook wrote:
> On October 19, 2022 6:10:48 PM PDT, Andrei Vagin <avagin@...il.com> wrote:
> >Test output:
> >RUN           global.user_notification_sync ...
> >seccomp_bpf.c:4279:user_notification_sync:basic: 8655 nsec/syscall
> >seccomp_bpf.c:4279:user_notification_sync:sync:	 2919 nsec/syscall
> >OK  global.user_notification_sync
> 
> This looks like a benchmark, not a functionality test. But maybe the test is "is sync faster than async?"
> 

Yes, it is. I found it quite useful for debugging and understanding that
everything works as expected. I like the idea to check that sync is
faster than async. I will add it and address all your other comments in
the next version. Thanks.