aboutsummaryrefslogtreecommitdiff
path: root/kernel/freezer.c
diff options
context:
space:
mode:
authorThomas Gleixner <tglx@linutronix.de>2009-07-17 14:15:47 +0200
committerThomas Gleixner <tglx@linutronix.de>2009-07-18 14:19:53 +0200
commit6301cb95c119ebf324bb96ee226fa9ddffad80a7 (patch)
tree7201f406d135212bae3775dc7d71cbdd6990e5de /kernel/freezer.c
parenta468d389349a7560249b355cdb6d2097ea1616c9 (diff)
downloadvexpress-lsk-6301cb95c119ebf324bb96ee226fa9ddffad80a7.tar.gz
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>
Diffstat (limited to 'kernel/freezer.c')
-rw-r--r--kernel/freezer.c7
1 files changed, 7 insertions, 0 deletions
diff --git a/kernel/freezer.c b/kernel/freezer.c
index 2f4936cf708..bd1d42b17cb 100644
--- a/kernel/freezer.c
+++ b/kernel/freezer.c
@@ -44,12 +44,19 @@ void refrigerator(void)
recalc_sigpending(); /* We sent fake signal, clean it up */
spin_unlock_irq(&current->sighand->siglock);
+ /* prevent accounting of that task to load */
+ current->flags |= PF_FREEZING;
+
for (;;) {
set_current_state(TASK_UNINTERRUPTIBLE);
if (!frozen(current))
break;
schedule();
}
+
+ /* Remove the accounting blocker */
+ current->flags &= ~PF_FREEZING;
+
pr_debug("%s left refrigerator\n", current->comm);
__set_current_state(save);
}