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authorRafael J. Wysocki <rjw@sisk.pl>2008-06-11 22:04:29 +0200
committerAndi Kleen <andi@basil.nowhere.org>2008-07-16 23:27:03 +0200
commitebb12db51f6c13b30752fcf506baad4c617b153c (patch)
tree55c08b82463ffd5b78a8bc4a4748261b02391593 /include/linux/freezer.h
parentd20a4dca47d2cd027ed58a13f91b424affd1f449 (diff)
downloadop-kernel-dev-ebb12db51f6c13b30752fcf506baad4c617b153c.zip
op-kernel-dev-ebb12db51f6c13b30752fcf506baad4c617b153c.tar.gz
Freezer: Introduce PF_FREEZER_NOSIG
The freezer currently attempts to distinguish kernel threads from user space tasks by checking if their mm pointer is unset and it does not send fake signals to kernel threads. However, there are kernel threads, mostly related to networking, that behave like user space tasks and may want to be sent a fake signal to be frozen. Introduce the new process flag PF_FREEZER_NOSIG that will be set by default for all kernel threads and make the freezer only send fake signals to the tasks having PF_FREEZER_NOSIG unset. Provide the set_freezable_with_signal() function to be called by the kernel threads that want to be sent a fake signal for freezing. This patch should not change the freezer's observable behavior. Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl> Signed-off-by: Andi Kleen <ak@linux.intel.com> Acked-by: Pavel Machek <pavel@suse.cz> Signed-off-by: Len Brown <len.brown@intel.com>
Diffstat (limited to 'include/linux/freezer.h')
-rw-r--r--include/linux/freezer.h10
1 files changed, 10 insertions, 0 deletions
diff --git a/include/linux/freezer.h b/include/linux/freezer.h
index 0893499..deddeed 100644
--- a/include/linux/freezer.h
+++ b/include/linux/freezer.h
@@ -128,6 +128,15 @@ static inline void set_freezable(void)
}
/*
+ * Tell the freezer that the current task should be frozen by it and that it
+ * should send a fake signal to the task to freeze it.
+ */
+static inline void set_freezable_with_signal(void)
+{
+ current->flags &= ~(PF_NOFREEZE | PF_FREEZER_NOSIG);
+}
+
+/*
* Freezer-friendly wrappers around wait_event_interruptible() and
* wait_event_interruptible_timeout(), originally defined in <linux/wait.h>
*/
@@ -174,6 +183,7 @@ static inline void freezer_do_not_count(void) {}
static inline void freezer_count(void) {}
static inline int freezer_should_skip(struct task_struct *p) { return 0; }
static inline void set_freezable(void) {}
+static inline void set_freezable_with_signal(void) {}
#define wait_event_freezable(wq, condition) \
wait_event_interruptible(wq, condition)
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