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sched: add optional support for CONFIG_HAVE_UNSTABLE_SCHED_CLOCK

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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>
This commit is contained in:
Peter Zijlstra 2008-05-03 18:29:28 +02:00 • committed by Ingo Molnar
parent a5574cf65b
commit 3e51f33fcc
7 changed files with 281 additions and 161 deletions
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7
kernel/sched_debug.c
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@ -204,13 +204,6 @@ static void print_cpu(struct seq_file *m, int cpu)
PN(next_balance);
P(curr->pid);
PN(clock);
PN(idle_clock);
PN(prev_clock_raw);
P(clock_warps);
P(clock_overflows);
P(clock_underflows);
P(clock_deep_idle_events);
PN(clock_max_delta);
P(cpu_load[0]);
P(cpu_load[1]);
P(cpu_load[2]);