]> err.no Git - linux-2.6/commit
sched: add optional support for CONFIG_HAVE_UNSTABLE_SCHED_CLOCK
authorPeter Zijlstra <a.p.zijlstra@chello.nl>
Sat, 3 May 2008 16:29:28 +0000 (18:29 +0200)
committerIngo Molnar <mingo@elte.hu>
Mon, 5 May 2008 21:56:18 +0000 (23:56 +0200)
commit3e51f33fcc7f55e6df25d15b55ed10c8b4da84cd
tree3752f9ea8e014ec40e95a1b197b0a3d18e1056a8
parenta5574cf65b5f03ce9ade3918764fe22e5e2371e3
sched: add optional support for CONFIG_HAVE_UNSTABLE_SCHED_CLOCK

this replaces the rq->clock stuff (and possibly cpu_clock()).

 - architectures that have an 'imperfect' hardware clock can set
   CONFIG_HAVE_UNSTABLE_SCHED_CLOCK

 - the 'jiffie' window might be superfulous when we update tick_gtod
   before the __update_sched_clock() call in sched_clock_tick()

 - cpu_clock() might be implemented as:

     sched_clock_cpu(smp_processor_id())

   if the accuracy proves good enough - how far can TSC drift in a
   single jiffie when considering the filtering and idle hooks?

[ mingo@elte.hu: various fixes and cleanups ]

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
include/linux/sched.h
init/main.c
kernel/Makefile
kernel/sched.c
kernel/sched_clock.c [new file with mode: 0644]
kernel/sched_debug.c
kernel/sched_fair.c