linux-kernel - Re: [PATCH v2] Document /proc/pid PID reuse behavior

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Message-ID: <20181120173912.GD3065@bombadil.infradead.org>
Date:   Tue, 20 Nov 2018 09:39:12 -0800
From:   Matthew Wilcox <willy@...radead.org>
To:     Pavel Machek <pavel@....cz>
Cc:     Vlastimil Babka <vbabka@...e.cz>,
        Daniel Colascione <dancol@...gle.com>,
        linux-kernel@...r.kernel.org, rppt@...ux.ibm.com,
        timmurray@...gle.com, joelaf@...gle.com, surenb@...gle.com,
        Jonathan Corbet <corbet@....net>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Roman Gushchin <guro@...com>,
        Mike Rapoport <rppt@...ux.vnet.ibm.com>,
        "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
        "Dennis Zhou (Facebook)" <dennisszhou@...il.com>,
        Prashant Dhamdhere <pdhamdhe@...hat.com>,
        "open list:DOCUMENTATION" <linux-doc@...r.kernel.org>
Subject: Re: [PATCH v2] Document /proc/pid PID reuse behavior

On Tue, Nov 20, 2018 at 10:18:29AM +0100, Pavel Machek wrote:
> > would ever rely on the pid being reused while having the descriptor
> > open. How would that make sense?
> 
> I agree this is corner space, but users might be surprised that
> keeping FDs of /proc/pid/X would lead to PID space exhaustion, for
> example.

We have a limit on the number of FDs a process can have open for a reason.
Well, for many reasons.