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sched: sched_clock_idle_[sleep|wakeup]_event()

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construct a more or less wall-clock time out of sched_clock(), by
using ACPI-idle's existing knowledge about how much time we spent
idling. This allows the rq clock to work around TSC-stops-in-C2,
TSC-gets-corrupted-in-C3 type of problems.

( Besides the scheduler's statistics this also benefits blktrace and
  printk-timestamps as well. )

Furthermore, the precise before-C2/C3-sleep and after-C2/C3-wakeup
callbacks allow the scheduler to get out the most of the period where
the CPU has a reliable TSC. This results in slightly more precise
task statistics.

the ACPI bits were acked by Len.

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Acked-by: Len Brown <len.brown@intel.com>
This commit is contained in:
Ingo Molnar
2007-08-23 15:18:02 +02:00
parent b377fd3982
commit 2aa44d0567
5 changed files with 61 additions and 19 deletions
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3
kernel/sched_debug.c
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@ -154,10 +154,11 @@ static void print_cpu(struct seq_file *m, int cpu)
P(next_balance);
P(curr->pid);
P(clock);
P(idle_clock);
P(prev_clock_raw);
P(clock_warps);
P(clock_overflows);
P(clock_unstable_events);
P(clock_deep_idle_events);
P(clock_max_delta);
P(cpu_load[0]);
P(cpu_load[1]);