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authorJeff Layton <jlayton@redhat.com>2011-12-01 22:44:39 +0100
committerRafael J. Wysocki <rjw@sisk.pl>2011-12-06 22:12:27 +0100
commitd310310cbff18ec385c6ab4d58f33b100192a96a (patch)
tree801dbbef1552256e7cefc7ec08dcd41b30a9930b /include/linux/freezer.h
parent62c9ea6b120688d800b4d892eaf737c20a73e86b (diff)
Freezer / sunrpc / NFS: don't allow TASK_KILLABLE sleeps to block the freezer
Allow the freezer to skip wait_on_bit_killable sleeps in the sunrpc layer. This should allow suspend and hibernate events to proceed, even when there are RPC's pending on the wire. Also, wrap the TASK_KILLABLE sleeps in NFS layer in freezer_do_not_count and freezer_count calls. This allows the freezer to skip tasks that are sleeping while looping on EJUKEBOX or NFS4ERR_DELAY sorts of errors. Signed-off-by: Jeff Layton <jlayton@redhat.com> Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Diffstat (limited to 'include/linux/freezer.h')
-rw-r--r--include/linux/freezer.h28
1 files changed, 28 insertions, 0 deletions
diff --git a/include/linux/freezer.h b/include/linux/freezer.h
index c1ee2833655e..30f06c220467 100644
--- a/include/linux/freezer.h
+++ b/include/linux/freezer.h
@@ -105,6 +105,29 @@ static inline int freezer_should_skip(struct task_struct *p)
}
/*
+ * These macros are intended to be used whenever you want allow a task that's
+ * sleeping in TASK_UNINTERRUPTIBLE or TASK_KILLABLE state to be frozen. Note
+ * that neither return any clear indication of whether a freeze event happened
+ * while in this function.
+ */
+
+/* Like schedule(), but should not block the freezer. */
+#define freezable_schedule() \
+({ \
+ freezer_do_not_count(); \
+ schedule(); \
+ freezer_count(); \
+})
+
+/* Like schedule_timeout_killable(), but should not block the freezer. */
+#define freezable_schedule_timeout_killable(timeout) \
+({ \
+ freezer_do_not_count(); \
+ schedule_timeout_killable(timeout); \
+ freezer_count(); \
+})
+
+/*
* Freezer-friendly wrappers around wait_event_interruptible(),
* wait_event_killable() and wait_event_interruptible_timeout(), originally
* defined in <linux/wait.h>
@@ -163,6 +186,11 @@ static inline void freezer_count(void) {}
static inline int freezer_should_skip(struct task_struct *p) { return 0; }
static inline void set_freezable(void) {}
+#define freezable_schedule() schedule()
+
+#define freezable_schedule_timeout_killable(timeout) \
+ schedule_timeout_killable(timeout)
+
#define wait_event_freezable(wq, condition) \
wait_event_interruptible(wq, condition)