netdev - Re: Fwd: [PATCH] [-mm] ACPI: export ACPI events via netlink

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Date:	Fri, 29 Jun 2007 09:02:52 -0400
From:	jamal <hadi@...erus.ca>
To:	Patrick McHardy <kaber@...sh.net>
Cc:	Johannes Berg <johannes@...solutions.net>,
	Zhang Rui <rui.zhang@...el.com>, netdev@...r.kernel.org,
	"linux-acpi@...r" <linux-acpi@...r.kernel.org>, lenb@...nel.org,
	Thomas Graf <tgraf@...g.ch>
Subject: Re: Fwd: [PATCH] [-mm] ACPI: export ACPI events via netlink

On Fri, 2007-29-06 at 14:48 +0200, Patrick McHardy wrote:
> Johannes Berg wrote:

> > Hmm, another thought: since we have 32 bits for group numbers and 16
> > bits for families we could just reserve 16 bits for groups within each
> > family. Or do we get trouble with that because in some place there's a
> > group bitmap or such?
> 
> 
> Yes, af_netlink has a bitmap per socket that is subscribed to any group.

I think this is the challenge. The groups belong to a global namespace.
i.e when you do a socket bind to group - it is unique regardless of the
family.
Our philosophy in genetlink is to have dynamic resources allocated and
released - remember the real reason we even have this is because we were
running out of numbers ;->
So while the static allocation of 16 bits per group will work (famous
last words "noone will ever need more than 640K of RAM";->) it will be
cleaner imo to allow dynamic allocation/release.
Maybe a mix (of a few static and mostly dynamic) as Patrick says - but
that would mean more coding for you ;-> Actually i like the idea of at
least your ID being your static mcast group and the rest are in the
dynamic pool (Hey, thanks Patrick;->). This means the first 2^16 are
static/reserved and if you want more groups, you register for them.

cheers,
jamal

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