linux-kernel - Re: [PATCH RFC 1/2] Add polling support to pidfd

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Message-ID: <c833c78b-445d-93d9-e59f-6bc62376c111@metux.net>
Date:   Wed, 24 Apr 2019 11:11:18 +0200
From:   "Enrico Weigelt, metux IT consult" <lkml@...ux.net>
To:     Christian Brauner <christian@...uner.io>,
        Daniel Colascione <dancol@...gle.com>
Cc:     Joel Fernandes <joel@...lfernandes.org>,
        Jann Horn <jannh@...gle.com>, Oleg Nesterov <oleg@...hat.com>,
        Florian Weimer <fweimer@...hat.com>,
        kernel list <linux-kernel@...r.kernel.org>,
        Andy Lutomirski <luto@...capital.net>,
        Steven Rostedt <rostedt@...dmis.org>,
        Suren Baghdasaryan <surenb@...gle.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Alexey Dobriyan <adobriyan@...il.com>,
        Al Viro <viro@...iv.linux.org.uk>,
        Andrei Vagin <avagin@...il.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Arnd Bergmann <arnd@...db.de>,
        "Eric W. Biederman" <ebiederm@...ssion.com>,
        Kees Cook <keescook@...omium.org>,
        linux-fsdevel <linux-fsdevel@...r.kernel.org>,
        "open list:KERNEL SELFTEST FRAMEWORK" 
        <linux-kselftest@...r.kernel.org>, Michal Hocko <mhocko@...e.com>,
        Nadav Amit <namit@...are.com>, Serge Hallyn <serge@...lyn.com>,
        Shuah Khan <shuah@...nel.org>,
        Stephen Rothwell <sfr@...b.auug.org.au>,
        Taehee Yoo <ap420073@...il.com>, Tejun Heo <tj@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        kernel-team <kernel-team@...roid.com>,
        Tycho Andersen <tycho@...ho.ws>
Subject: Re: [PATCH RFC 1/2] Add polling support to pidfd

On 20.04.19 01:02, Christian Brauner wrote:

> I'm sorry, who has agreed that a non-parent should be able to wait for
> process death?
> I know you proposed that but has anyone ever substantially supported this?

I actually support this.

One practical usecase I have in mind for some upcoming projects is
monitoring processes in a container from the outside.


--mtx

-- 
Enrico Weigelt, metux IT consult
Free software and Linux embedded engineering
info@...ux.net -- +49-151-27565287