linux-kernel - Re: [take19 1/4] kevent: Core files.

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Message-Id: <200610171826.05028.dada1@cosmosbay.com>
Date:	Tue, 17 Oct 2006 18:26:04 +0200
From:	Eric Dumazet <dada1@...mosbay.com>
To:	Evgeniy Polyakov <johnpol@....mipt.ru>
Cc:	Johann Borck <johann.borck@...sedata.com>,
	Ulrich Drepper <drepper@...hat.com>,
	Ulrich Drepper <drepper@...il.com>,
	lkml <linux-kernel@...r.kernel.org>,
	David Miller <davem@...emloft.net>,
	Andrew Morton <akpm@...l.org>, netdev <netdev@...r.kernel.org>,
	Zach Brown <zach.brown@...cle.com>,
	Christoph Hellwig <hch@...radead.org>,
	Chase Venters <chase.venters@...entec.com>
Subject: Re: [take19 1/4] kevent: Core files.

On Tuesday 17 October 2006 18:01, Evgeniy Polyakov wrote:

> Ok, there is one apologist for mmap buffer implementation, who forced me
> to create first implementation, which was dropped due to absense of
> remote mental reading abilities.
> Ulrich, does above approach sound good for you?
> I actually do not want to reimplement something, that will be
> pointed to with words 'no matter what you say, it is broken and I do not
> want it' again :).

In my humble opinion, you should first write a 'real application', to show how 
the mmap buffer and kevent syscalls would be used (fast path and 
slow/recovery paths). I am sure it would be easier for everybody to agree on 
the API *before* you start coding a *lot* of hard (kernel) stuff : It would 
certainly save your mental CPU cycles (and ours too :) )

This 'real application' could be  the event loop of a simple HTTP server, or a 
basic 'echo all' server. Adding the bits about timers events and signals 
should be done too.

Eric
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