linux-kernel - Re: [take12 0/3] kevent: Generic event handling mechanism.

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Message-Id: <20060823000758.5ebed7dd.akpm@osdl.org>
Date:	Wed, 23 Aug 2006 00:07:58 -0700
From:	Andrew Morton <akpm@...l.org>
To:	Evgeniy Polyakov <johnpol@....mipt.ru>
Cc:	Jari Sundell <sundell.software@...il.com>,
	David Miller <davem@...emloft.net>, kuznet@....inr.ac.ru,
	nmiell@...cast.net, linux-kernel@...r.kernel.org,
	drepper@...hat.com, netdev@...r.kernel.org, zach.brown@...cle.com,
	hch@...radead.org
Subject: Re: [take12 0/3] kevent: Generic event handling mechanism.

On Wed, 23 Aug 2006 10:56:59 +0400
Evgeniy Polyakov <johnpol@....mipt.ru> wrote:

> On Wed, Aug 23, 2006 at 02:43:50AM +0200, Jari Sundell (sundell.software@...il.com) wrote:
> > Actually, I didn't miss that, it is an orthogonal issue. A timespec
> > timeout parameter for the syscall does not imply the use of timespec
> > in any timer event, etc. Nor is there any timespec timer in kqueue's
> > struct kevent, which is the only (interface related) thing that will
> > be exposed.
> 
> void * in structure exported to userspace is forbidden.
> long in syscall requires wrapper in per-arch code (although that
> workaround _is_ there, it does not mean that broken interface should 
> be used).
> poll uses millisecods - it is perfectly ok.

I wonder whether designing-in a millisecond granularity is the right thing
to do.  If in a few years the kernel is running tickless with high-res clock
interrupt sources, that might look a bit lumpy.

Switching it to a __u64 nanosecond counter would be basically free on
64-bit machines, and not very expensive on 32-bit, no?
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