linux-kernel - Re: [PATCH] sysctl: add support for poll()

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Message-ID: <CAPXgP12sxLmPXzXx_Qgf=JakmiZcuiMGmMKB8RG4sFU_U5f=jg@mail.gmail.com>
Date:	Wed, 3 Aug 2011 00:53:33 +0200
From:	Kay Sievers <kay.sievers@...y.org>
To:	Lucas De Marchi <lucas.demarchi@...fusion.mobi>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	linux-kernel@...r.kernel.org, Nick Piggin <npiggin@...nel.dk>,
	Al Viro <viro@...iv.linux.org.uk>,
	Christoph Hellwig <hch@....de>,
	Stephen Rothwell <sfr@...b.auug.org.au>,
	David Howells <dhowells@...hat.com>,
	"Serge E. Hallyn" <serge.hallyn@...onical.com>,
	Daniel Lezcano <daniel.lezcano@...e.fr>,
	Jiri Slaby <jslaby@...e.cz>,
	Greg Kroah-Hartman <gregkh@...e.de>,
	James Morris <jmorris@...ei.org>, neilb@...e.de
Subject: Re: [PATCH] sysctl: add support for poll()

On Tue, Jul 26, 2011 at 04:17, Lucas De Marchi
<lucas.demarchi@...fusion.mobi> wrote:
> On Mon, Jun 13, 2011 at 1:05 PM, Kay Sievers <kay.sievers@...y.org> wrote:
>> On Thu, 2011-06-09 at 15:16 +0200, Kay Sievers wrote:
>>> On Thu, Jun 9, 2011 at 00:17, Andrew Morton <akpm@...ux-foundation.org> wrote:
>>
>>> > We already have several pollable procfs files, such as
>>> > fs/proc/base.c:mounts_poll() and I think drivers/md has one.  I do
>>> > think that any work in this area should end up with those custom
>>> > make-procfs-pollable hacks being identified and removed.
>>>
>>> For these files we can probably move the event counter into the
>>> seq_file structure, and get rid of the dance to kmalloc it and assign
>>> it to seq_file->private. That might simplify the logic a bit.
>>>
>>> [Adding Neil, to get his opinion of moving 'event' so seq_file and get
>>> rid of the malloc dance]
>>
>> I guess, we could do something like this, which looks quite a bit
>> simpler by moving the poll event counter into the dynamically allocated
>> seq_file structure itself, instead of having private structures
>> allocated on top to just carry the counter (patch is just
>> compile-tested).
>
> Now that this cleanup made its way, could we look again to to the
> pollable sysctl implementation?

Can we please get support for poll() for /proc/sys files merged? Just
like we do that for /proc already.

We like to have notifications triggered by the kernel for selected
files in /proc/sys.

I don't really see any technical reasons to hold this back.

Thanks,
Kay
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