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sched: x86, track TSC-unstable events

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track TSC-unstable events and propagate it to the scheduler code.
Also allow sched_clock() to be used when the TSC is unstable,
the rq_clock() wrapper creates a reliable clock out of it.

Signed-off-by: Ingo Molnar <[email protected]>
This commit is contained in:
Ingo Molnar 2007-07-09 18:51:59 +02:00
commit bb29ab2686
3 changed files with 17 additions and 1 deletions
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7
kernel/sched.c
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@ -67,6 +67,13 @@ unsigned long long __attribute__((weak)) sched_clock(void)
return (unsigned long long)jiffies * (1000000000 / HZ);
}
/*
* CPU frequency is/was unstable - start new by setting prev_clock_raw:
*/
void sched_clock_unstable_event(void)
{
}
/*
* Convert user-nice values [ -20 ... 0 ... 19 ]
* to static priority [ MAX_RT_PRIO..MAX_PRIO-1 ],