]> err.no Git - linux-2.6/commit
sched: sched_setscheduler() fix
authorDmitry Adamushko <dmitry.adamushko@gmail.com>
Mon, 15 Oct 2007 15:00:07 +0000 (17:00 +0200)
committerIngo Molnar <mingo@elte.hu>
Mon, 15 Oct 2007 15:00:07 +0000 (17:00 +0200)
commitd02e5ed8d55e2a2b2735232ea1da40ffbf4c0932
treede972b3b1318deb834f61b6dba967ad32845c229
parent29f59db3a74b0bdf78a1f5b53ef773caa82692dc
sched: sched_setscheduler() fix

Fix a problem in the 'sched-group' patch for !CONFIG_FAIR_GROUP_SCHED.

description:

sched_setscheduler()
{
...
if (task_running()) p->sched_class->put_prev_entity();

[ this one sets up cfs_rq->curr to NULL ]

...

if (task_running) p->sched_class->set_curr_task();

[ and this one is a _NOP_ (empty) for !CONFIG_FAIR_GROUP_SCHED ]

As a result, the task continues to run with cfs_rq->curr == NULL... no
crashes (due to checks for !NULL in place) but e.g. update_curr()
effectively becomes a NOP... i.e. runtime statistics for this task is
not accounted untill it's rescheduled anew.

Signed-off-by: Dmitry Adamushko <dmitry.adamushko@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
kernel/sched_fair.c