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Re: [Lse-tech] Re: A common layer for Accounting packages

To: Andrew Morton <akpm@xxxxxxxx>
Subject: Re: [Lse-tech] Re: A common layer for Accounting packages
From: Evgeniy Polyakov <johnpol@xxxxxxxxxxx>
Date: Mon, 28 Feb 2005 11:04:36 +0300
Cc: Guillaume Thouvenin <guillaume.thouvenin@xxxxxxxx>, kaigai@xxxxxxxxxxxxx, marcelo.tosatti@xxxxxxxxxxxx, davem@xxxxxxxxxx, jlan@xxxxxxx, lse-tech@xxxxxxxxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, netdev@xxxxxxxxxxx, elsa-devel@xxxxxxxxxxxxxxxxxxxxx
In-reply-to: <20050227233943.6cb89226.akpm@xxxxxxxx>
Organization: MIPT
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Reply-to: johnpol@xxxxxxxxxxx
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On Sun, 2005-02-27 at 23:39 -0800, Andrew Morton wrote:
> Guillaume Thouvenin <guillaume.thouvenin@xxxxxxxx> wrote:
> >
> >    Ok the protocol is maybe too "basic" but with this mechanism the user
> >  space application that uses the fork connector can start and stop the
> >  send of messages. This implementation needs somme improvements because
> >  currently, if two application are using the fork connector one can
> >  enable it and the other don't know if it is enable or not, but the idea
> >  is here I think.
> 
> Yes.  But this problem can be solved in userspace, with a little library
> function and a bit of locking.
> 
> IOW: use the library to enable/disable the fork connector rather than
> directly doing syscalls.
> 
> It has the problem that if a client of that library crashes, the counter
> gets out of whack, but really, it's not all _that_ important, and to handle
> this properly in-kernel each client would need an open fd against some
> object so we can do the close-on-exit thing properly.  You'd need to create
> a separate netlink socket for the purpose.

Why dont just extend protocol a bit?
Add header after cn_msg, which will have get/set field and that is all.
Properly using seq/ack fields userspace can avoid locks.

-- 
        Evgeniy Polyakov

Crash is better than data corruption -- Arthur Grabowski

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