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authorRafael J. Wysocki <rjw@sisk.pl>2008-06-11 16:04:29 -0400
committerAndi Kleen <andi@basil.nowhere.org>2008-07-16 17:27:03 -0400
commitebb12db51f6c13b30752fcf506baad4c617b153c (patch)
tree55c08b82463ffd5b78a8bc4a4748261b02391593 /include/linux/sched.h
parentd20a4dca47d2cd027ed58a13f91b424affd1f449 (diff)
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/sched.h')
-rw-r--r--include/linux/sched.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/sched.h b/include/linux/sched.h
index 21349173d148..ba2f859c6e4f 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -1494,6 +1494,7 @@ static inline void put_task_struct(struct task_struct *t)
1494#define PF_MEMPOLICY 0x10000000 /* Non-default NUMA mempolicy */ 1494#define PF_MEMPOLICY 0x10000000 /* Non-default NUMA mempolicy */
1495#define PF_MUTEX_TESTER 0x20000000 /* Thread belongs to the rt mutex tester */ 1495#define PF_MUTEX_TESTER 0x20000000 /* Thread belongs to the rt mutex tester */
1496#define PF_FREEZER_SKIP 0x40000000 /* Freezer should not count it as freezeable */ 1496#define PF_FREEZER_SKIP 0x40000000 /* Freezer should not count it as freezeable */
1497#define PF_FREEZER_NOSIG 0x80000000 /* Freezer won't send signals to it */
1497 1498
1498/* 1499/*
1499 * Only the _current_ task can read/write to tsk->flags, but other 1500 * Only the _current_ task can read/write to tsk->flags, but other