tree 7201f406d135212bae3775dc7d71cbdd6990e5de
parent a468d389349a7560249b355cdb6d2097ea1616c9
author Thomas Gleixner <tglx@linutronix.de> 1247832947 +0200
committer Thomas Gleixner <tglx@linutronix.de> 1247919593 +0200

sched: fix nr_uninterruptible accounting of frozen tasks really

commit e3c8ca8336 (sched: do not count frozen tasks toward load) broke
the nr_uninterruptible accounting on freeze/thaw. On freeze the task
is excluded from accounting with a check for (task->flags &
PF_FROZEN), but that flag is cleared before the task is thawed. So
while we prevent that the task with state TASK_UNINTERRUPTIBLE
is accounted to nr_uninterruptible on freeze we decrement
nr_uninterruptible on thaw.

Use a separate flag which is handled by the freezing task itself. Set
it before calling the scheduler with TASK_UNINTERRUPTIBLE state and
clear it after we return from frozen state.

Cc: <stable@kernel.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>