Andrew, All,
Here is an updated version of the smaller, reworked and
improved patchset I mailed out monday. Please consider for inclusion
into your tree.
Again, the majority of this new incremental design should be credited
to Roman Zippel, but it is my implementation, so he gets the credit and
I get the blame. :)
Summary:
This patchset provides a generic timekeeping infrastructure
that are independent of the timer interrupt. This allows for robust and
correct behavior in cases of late or lost ticks, avoids interpolation
errors, reduces duplication in arch specific code, and allows or
assists future changes such as high-res timers, dynamic ticks, or
realtime preemption. Additionally, it provides finer nanosecond
resolution values to the clock_gettime functions. The patchset also
converts the i386 arch to use this new infrastructure.
Changes since the C0 release:
o Cut out functions that are no longer used
o Re-arranged patch chunks so each patch makes more sense.
o Few small fixes.
o Improved comments.
On my TODO list:
o More attention on x86-64 and powerpc
o Re-add bits needed for inclusion into HRT and RT
o Try to restore cleanups via small patches
The patchset applies against the current 2.6.16-git.
The complete patchset can be found here:
http://sr71.net/~jstultz/tod/
I'd like to thank the following people who have contributed ideas,
criticism, testing and code that has helped shape this work:
George Anzinger, Nish Aravamudan, Max Asbock, Serge Belyshev,
Dominik Brodowski, Adrian Bunk, Thomas Gleixner, Darren Hart, Christoph
Lameter, Matt Mackal, Keith Mannthey, Ingo Molnar, Andrew Morton, Paul
Munt, Martin Schwidefsky, Frank Sorenson, Ulrich Windl, Jonathan
Woithe, Darrick Wong, Roman Zippel and any others whom I've
accidentally left off this list.
thanks
-john
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