lkml.org 
[lkml]   [2006]   [Aug]   [23]   [last100]   RSS Feed
Views: [more markup]  [less markup]  [headers]  [forward] 
 
Messages in this thread
/
DateWed, 23 Aug 2006 11:10:03 +0400
FromEvgeniy Polyakov <>
SubjectRe: [take12 0/3] kevent: Generic event handling mechanism.
On Wed, Aug 23, 2006 at 12:07:58AM -0700, Andrew Morton (akpm@osdl.org) wrote:
> On Wed, 23 Aug 2006 10:56:59 +0400
> Evgeniy Polyakov <johnpol@2ka.mipt.ru> wrote:
> 
> > On Wed, Aug 23, 2006 at 02:43:50AM +0200, Jari Sundell (sundell.software@gmail.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?

Let's then place there a structure with 64bit seconds and nanoseconds,
similar to timspec, but without longs there.
What do you think?

-- 
	Evgeniy Polyakov
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2006-08-23 07:13    [from the cache]
©2003-2008