Add a helper which checks whether we failed to freeze all the processes
of a given type (ignoring uninterruptible threads). If such processes
are found, we notify the user.
Signed-off-by: Nigel Cunningham <[email protected]>
kernel/power/process.c | 40 ++++++++++++++++++++++++++++++++++++++++
1 files changed, 40 insertions(+), 0 deletions(-)
diff --git a/kernel/power/process.c b/kernel/power/process.c
index b2a9147..4322155 100644
--- a/kernel/power/process.c
+++ b/kernel/power/process.c
@@ -298,6 +298,46 @@ static void prod_processes(int do_all_th
read_unlock(&tasklist_lock);
}
+/*
+ * Freezer failure.
+ *
+ * Check whether we failed to freeze all the processes that
+ * should be frozen. If we find a task that failed to freeze,
+ * we give useful information on what failed and how.
+ */
+static int freezer_failure(int do_all_threads)
+{
+ int result = 0;
+ struct task_struct *g, *p;
+
+ read_lock(&tasklist_lock);
+ do_each_thread(g, p) {
+ if (!freezeable(p, do_all_threads) ||
+ p->state == TASK_UNINTERRUPTIBLE)
+ continue;
+
+ if (!result) {
+ printk(KERN_ERR "Stopping tasks failed.\n");
+ printk(KERN_ERR "Tasks that refused to be "
+ "refrigerated and haven't since exited:\n");
+ set_freezer_state(ABORT_FREEZING);
+ result = 1;
+ }
+
+ if ((freezing(p))) {
+ printk(" - %s (#%d) signalled but "
+ "didn't enter refrigerator.\n",
+ p->comm, p->pid);
+ } else
+ printk(" - %s (#%d) signalled "
+ "and todo list empty.\n",
+ p->comm, p->pid);
+ } while_each_thread(g, p);
+ read_unlock(&tasklist_lock);
+
+ return result;
+}
+
static inline void freeze(struct task_struct *p)
{
unsigned long flags;
--
Nigel Cunningham nigel at suspend2 dot net
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