Add a helper which counts the number of patches of a type (all
or userspace only) which are in TASK_UNINTERRUPTIBLE state.
These tasks are signalled (just in case they leave that state at
a later point), but we do not consider freezing to have failed
if and when they do not enter the freezer.
Note that when they eventually leave TASK_UNINTERRUPTIBLE state,
they will enter the refrigerator, but will immediately exit if
we no longer want to freeze at that point.
Signed-off-by: Nigel Cunningham <[email protected]>
kernel/power/process.c | 23 +++++++++++++++++++++++
1 files changed, 23 insertions(+), 0 deletions(-)
diff --git a/kernel/power/process.c b/kernel/power/process.c
index d5d052a..9cfafa7 100644
--- a/kernel/power/process.c
+++ b/kernel/power/process.c
@@ -227,6 +227,29 @@ static int num_freezeable(int do_all_thr
return todo_this_type;
}
+/*
+ * num_uninterruptible
+ *
+ * Description: Determine how many processes of our type are in state
+ * task uninterruptible.
+ * Parameters: int Which type we are trying to freeze.
+ */
+static int num_uninterruptible(int do_all_threads)
+{
+ struct task_struct *g, *p;
+ int count = 0;
+
+ read_lock(&tasklist_lock);
+ do_each_thread(g, p) {
+ if (freezeable(p, do_all_threads) &&
+ p->state == TASK_UNINTERRUPTIBLE)
+ count++;
+ } while_each_thread(g, p);
+ read_unlock(&tasklist_lock);
+
+ return count;
+}
+
static inline void freeze(struct task_struct *p)
{
unsigned long flags;
--
Nigel Cunningham nigel at suspend2 dot net
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