linux-kernel - Re: [PATCH v2 3/3] nvme: fire discovery log page change events to userspace

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Message-ID: <20190830055514.GC8492@lst.de>
Date:   Fri, 30 Aug 2019 07:55:14 +0200
From:   Christoph Hellwig <hch@....de>
To:     Sagi Grimberg <sagi@...mberg.me>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Christoph Hellwig <hch@....de>, linux-nvme@...ts.infradead.org,
        Keith Busch <keith.busch@...el.com>,
        James Smart <james.smart@...adcom.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 3/3] nvme: fire discovery log page change events to
 userspace

On Thu, Aug 29, 2019 at 11:21:02AM -0700, Sagi Grimberg wrote:
>> Yes we do, userspace should use it to order events.  Does udev not
>> handle that properly today?
>
> The problem is not ordering of events, its really about the fact that
> the chardev can be removed and reallocated for a different controller
> (could be a completely different discovery controller) by the time
> that userspace handles the event.

The same is generally true for lot of kernel devices.  We could reduce
the chance by using the idr cyclic allocator.