linux-kernel - Re: [RFC PATCH 5/6] selftests: Challenge RLIMIT

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Date:   Tue, 15 Feb 2022 10:45:00 +0100
From:   Michal Koutný <mkoutny@...e.com>
To:     Shuah Khan <skhan@...uxfoundation.org>
Cc:     Eric Biederman <ebiederm@...ssion.com>,
        Alexey Gladkov <legion@...nel.org>,
        Kees Cook <keescook@...omium.org>,
        Shuah Khan <shuah@...nel.org>,
        Christian Brauner <brauner@...nel.org>,
        Solar Designer <solar@...nwall.com>,
        Ran Xiaokai <ran.xiaokai@....com.cn>,
        linux-kernel@...r.kernel.org, linux-kselftest@...r.kernel.org,
        Linux Containers <containers@...ts.linux-foundation.org>
Subject: Re: [RFC PATCH 5/6] selftests: Challenge RLIMIT_NPROC in user
 namespaces

On Wed, Feb 09, 2022 at 06:22:18PM -0700, Shuah Khan <skhan@...uxfoundation.org> wrote:
> Please see comments below. A bit of a concern with how long this test
> will run.  Did you time it?

It runs around 1 s, I didn't measure it and I used it manually only.

> How long does this test now run for with this loop?

I kept this sleep to space output from individual tasks for
better readability of output. It's not necessary for the sake of the
test. I'll remove it in next version.

> > -	for (i = 0; i < NR_CHILDS; i++) {
> > +	for (i = 0; i < NR_CHILDREN; i++) {
> >   		if (WIFEXITED(wstatus[i]))
> >   			warnx("(pid=%d): pid %d exited, status=%d",
> >   				pid, -child[i], WEXITSTATUS(wstatus[i]));
> > 
> 
> Please a add few more comments in the code path.

Hehe, this is inherited from the original version. (True, it's not
overly clear on its own.)

Michal