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    Subject[ 15/23] [Suspend2] Helper for counting uninterruptible threads of a type.
    Date

    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
    -
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