Messages in this thread Patch in this message | | | From | Nigel Cunningham <> | Subject | [ 15/23] [Suspend2] Helper for counting uninterruptible threads of a type. | Date | Thu, 26 Jan 2006 13:45:57 +1000 |
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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 <nigel@suspend2.net>
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 - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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