diff options
| author | Glauber Costa <glommer@redhat.com> | 2011-07-11 21:28:18 +0200 |
|---|---|---|
| committer | Avi Kivity <avi@redhat.com> | 2011-07-14 11:59:47 +0200 |
| commit | 095c0aa83e52d6c3dd7168610746703921f570af (patch) | |
| tree | 7461604a6040f1724bdf66c6f87e3abe60e2ad50 /kernel/sched_features.h | |
| parent | KVM guest: Steal time accounting (diff) | |
| download | linux-095c0aa83e52d6c3dd7168610746703921f570af.tar.xz linux-095c0aa83e52d6c3dd7168610746703921f570af.zip | |
sched: adjust scheduler cpu power for stolen time
This patch makes update_rq_clock() aware of steal time.
The mechanism of operation is not different from irq_time,
and follows the same principles. This lives in a CONFIG
option itself, and can be compiled out independently of
the rest of steal time reporting. The effect of disabling it
is that the scheduler will still report steal time (that cannot be
disabled), but won't use this information for cpu power adjustments.
Everytime update_rq_clock_task() is invoked, we query information
about how much time was stolen since last call, and feed it into
sched_rt_avg_update().
Although steal time reporting in account_process_tick() keeps
track of the last time we read the steal clock, in prev_steal_time,
this patch do it independently using another field,
prev_steal_time_rq. This is because otherwise, information about time
accounted in update_process_tick() would never reach us in update_rq_clock().
Signed-off-by: Glauber Costa <glommer@redhat.com>
Acked-by: Rik van Riel <riel@redhat.com>
Acked-by: Peter Zijlstra <peterz@infradead.org>
Tested-by: Eric B Munson <emunson@mgebm.net>
CC: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
CC: Anthony Liguori <aliguori@us.ibm.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
Diffstat (limited to 'kernel/sched_features.h')
| -rw-r--r-- | kernel/sched_features.h | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/kernel/sched_features.h b/kernel/sched_features.h index be40f7371ee1..ca3b025f8669 100644 --- a/kernel/sched_features.h +++ b/kernel/sched_features.h @@ -61,9 +61,9 @@ SCHED_FEAT(LB_BIAS, 1) SCHED_FEAT(OWNER_SPIN, 1) /* - * Decrement CPU power based on irq activity + * Decrement CPU power based on time not spent running tasks */ -SCHED_FEAT(NONIRQ_POWER, 1) +SCHED_FEAT(NONTASK_POWER, 1) /* * Queue remote wakeups on the target CPU and process them |