lkml.org 
[lkml]   [2005]   [May]   [15]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: IA64 implementation of timesource for new time of day subsystem
Christoph Lameter wrote:
> On Fri, 13 May 2005, john stultz wrote:
>
>
>>I look forward to your comments and feedback.
>
>
> Here is the implementation of the IA64 timesources for the new time of
> day subsystem.
>
> This is quite straighforward. Thanks John. However, the ITC
> interpolator can no longer use MMIO in SMP situations since there is no
> provision for jitter compensation in the new time of day subsystem. I have
> implemented that via a function now which will slow down clock access
> for non SGI IA64 hardware significantly since it will not be able to use
> the fastcall anymore.
>
> I am working on the fastcall but I would need a couple of changes
> to the core code to make the following symbols non-static since they
> will need to be accessed from the fast syscall handler:
>
> timesource
> system_time
> wall_time_offset
> offset_base
>

Will this mean that Linux will have a monotonic time source?
For media players we need a timesource that does not change under any
circumstances. e.g. User changes the clock time, the monotonic time
source should not change. The monotonic time source should just start at
0 at power on, and continually increase accurately over time. I.e. A
very accurate "uptime" measurement.

James
-
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: 2005-05-15 11:16    [W:1.362 / U:0.004 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site