tree 27623dcd39c52a80b79e0ee86ab426fc9c7e2b46
parent a8941d7ec81678fb69aea7183338175f112f3e0d
author Peter Zijlstra <a.p.zijlstra@chello.nl> 1295280207 +0100
committer Ingo Molnar <mingo@elte.hu> 1296041602 +0100

sched: Fix switch_from_fair()

When a task is taken out of the fair class we must ensure the vruntime
is properly normalized because when we put it back in it will assume
to be normalized.

The case that goes wrong is when changing away from the fair class
while sleeping. Sleeping tasks have non-normalized vruntime in order
to make sleeper-fairness work. So treat the switch away from fair as a
wakeup and preserve the relative vruntime.

Also update sysrq-n to call the ->switch_{to,from} methods.

Reported-by: Onkalo Samu <samu.p.onkalo@nokia.com>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
LKML-Reference: <new-submission>
Signed-off-by: Ingo Molnar <mingo@elte.hu>