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

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Date:	Wed, 23 Aug 2006 01:18:50 -0700
From:	Nicholas Miell <nmiell@...cast.net>
To:	David Miller <davem@...emloft.net>
Cc:	akpm@...l.org, johnpol@....mipt.ru, sundell.software@...il.com,
	kuznet@....inr.ac.ru, 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, 2006-08-23 at 00:35 -0700, David Miller wrote:
> From: Andrew Morton <akpm@...l.org>
> Date: Wed, 23 Aug 2006 00:07:58 -0700
> 
> > 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?
> 
> If it ends up in a structure we'll need to use the "aligned_u64" type
> in order to avoid problems with 32-bit x86 binaries running on 64-bit
> kernels.

Perhaps

struct timespec64
{
	uint64_t tv_sec __attribute__((aligned(8)));
	uint32_t tv_nsec;
}

with a snide remark about gcc in the comments?

-- 
Nicholas Miell <nmiell@...cast.net>

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