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    Subject[PATCH v2 09/10] sigtimedwait: use freezable blocking call
    Date
    Avoid waking up every thread sleeping in a sigtimedwait call during
    suspend and resume by calling a freezable blocking call. Previous
    patches modified the freezer to avoid sending wakeups to threads
    that are blocked in freezable blocking calls.

    This call was selected to be converted to a freezable call because
    it doesn't hold any locks or release any resources when interrupted
    that might be needed by another freezing task or a kernel driver
    during suspend, and is a common site where idle userspace tasks are
    blocked.

    Signed-off-by: Colin Cross <ccross@android.com>
    ---
    kernel/signal.c | 2 +-
    1 file changed, 1 insertion(+), 1 deletion(-)

    diff --git a/kernel/signal.c b/kernel/signal.c
    index 598dc06..10a70a0 100644
    --- a/kernel/signal.c
    +++ b/kernel/signal.c
    @@ -2845,7 +2845,7 @@ int do_sigtimedwait(const sigset_t *which, siginfo_t *info,
    recalc_sigpending();
    spin_unlock_irq(&tsk->sighand->siglock);

    - timeout = schedule_timeout_interruptible(timeout);
    + timeout = freezable_schedule_timeout_interruptible(timeout);

    spin_lock_irq(&tsk->sighand->siglock);
    __set_task_blocked(tsk, &tsk->real_blocked);
    --
    1.8.2.1


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