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    watchdog: introduce touch_softlockup_watchdog_sched() · 03e0d461
    Tejun Heo 提交于
    touch_softlockup_watchdog() is used to tell watchdog that scheduler
    stall is expected.  One group of usage is from paths where the task
    may not be able to yield for a long time such as performing slow PIO
    to finicky device and coming out of suspend.  The other is to account
    for scheduler and timer going idle.
    
    For scheduler softlockup detection, there's no reason to distinguish
    the two cases; however, workqueue lockup detector is planned and it
    can use the same signals from the former group while the latter would
    spuriously prevent detection.  This patch introduces a new function
    touch_softlockup_watchdog_sched() and convert the latter group to call
    it instead.  For now, it just calls touch_softlockup_watchdog() and
    there's no functional difference.
    Signed-off-by: NTejun Heo <tj@kernel.org>
    Cc: Ulrich Obergfell <uobergfe@redhat.com>
    Cc: Ingo Molnar <mingo@redhat.com>
    Cc: Peter Zijlstra <peterz@infradead.org>
    Cc: Thomas Gleixner <tglx@linutronix.de>
    Cc: Andrew Morton <akpm@linux-foundation.org>
    03e0d461
tick-sched.c 28.9 KB