netdev - Re: [take28-resend_1->0 0/8] kevent: Generic event handling mechanism.

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Date:	Thu, 21 Dec 2006 19:51:43 +0300
From:	Evgeniy Polyakov <johnpol@....mipt.ru>
To:	jamal <hadi@...erus.ca>
Cc:	Jeff Garzik <jeff@...zik.org>, linux-kernel@...r.kernel.org,
	David Miller <davem@...emloft.net>,
	Ulrich Drepper <drepper@...hat.com>,
	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>,
	Johann Borck <johann.borck@...sedata.com>
Subject: Re: [take28-resend_1->0 0/8] kevent: Generic event handling mechanism.

On Thu, Dec 21, 2006 at 11:42:04AM -0500, jamal (hadi@...erus.ca) wrote:
> > > > Things like sockets/pipes can only benefit from direct kevent usage 
> > > > instead of ->poll() and wrappers.
> > > 
> > > You should be able change it to use those schemes when it detects
> > > that the kernel supports them.
> > 
> > I.e. stat() for each new file descriptor - note, that _you_ asked it :)
> 
> Didnt follow. Is there some issue with libevent you mean? 

libevent provides file descriptor without any additional info about it -
so when it is added into the waiting subsystem, userspace must select
different usage cases (i.e. different kevent notifications for different
types of file descriptor - socket notifications for sockets and pipes,
poll/select for all others), this requires stat() call per provided file
descriptor.

Event addition/waiting itself is the same - only parameters (type and
requested event) are changed.

> cheers,
> jamal

-- 
	Evgeniy Polyakov
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