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[PATCH] sched: arch preempt notifier mechanism

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This adds a general mechanism whereby a task can request the scheduler to
notify it whenever it is preempted or scheduled back in.  This allows the
task to swap any special-purpose registers like the fpu or Intel's VT
registers.

Signed-off-by: Avi Kivity <avi@qumranet.com>
[ mingo@elte.hu: fixes, cleanups ]
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Avi Kivity 2007-07-26 13:40:43 +02:00 • committed by Ingo Molnar
commit e107be36ef
4 changed files with 123 additions and 2 deletions
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5
include/linux/sched.h
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@ -935,6 +935,11 @@ struct task_struct {
struct sched_class *sched_class;
struct sched_entity se;
#ifdef CONFIG_PREEMPT_NOTIFIERS
/* list of struct preempt_notifier: */
struct hlist_head preempt_notifiers;
#endif
unsigned short ioprio;
#ifdef CONFIG_BLK_DEV_IO_TRACE
unsigned int btrace_seq;