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

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Message-ID: <CAMOw1v5veDqE+=gbNBn3juXHOOp764d7F20XtwUJXZoBW45zyg@mail.gmail.com>
Date:	Mon, 25 Jul 2011 23:17:48 -0300
From:	Lucas De Marchi <lucas.demarchi@...fusion.mobi>
To:	Kay Sievers <kay.sievers@...y.org>
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 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?


thanks
Lucas De Marchi
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