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    Subject[PATCH 7/8] sched: Ignore TASK_IDLE for SysRq-W
    Markus reported that tasks in TASK_IDLE state are reported by SysRq-W,
    which results in undesirable clutter.

    Reported-by: Markus Trippelsdorf <markus@trippelsdorf.de>
    Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
    ---
    kernel/sched/core.c | 24 +++++++++++++++++++++++-
    1 file changed, 23 insertions(+), 1 deletion(-)

    --- a/kernel/sched/core.c
    +++ b/kernel/sched/core.c
    @@ -5164,6 +5164,28 @@ void sched_show_task(struct task_struct
    put_task_stack(p);
    }

    +static inline bool
    +state_filter_match(unsigned long state_filter, struct task_struct *p)
    +{
    + /* no filter, everything matches */
    + if (!state_filter)
    + return true;
    +
    + /* filter, but doesn't match */
    + if (!(p->state & state_filter))
    + return false;
    +
    + /*
    + * When looking for TASK_UNINTERRUPTIBLE skip TASK_IDLE (allows
    + * TASK_KILLABLE).
    + */
    + if (state_filter == TASK_UNINTERRUPTIBLE && p->state == TASK_IDLE)
    + return false;
    +
    + return true;
    +}
    +
    +
    void show_state_filter(unsigned long state_filter)
    {
    struct task_struct *g, *p;
    @@ -5186,7 +5208,7 @@ void show_state_filter(unsigned long sta
    */
    touch_nmi_watchdog();
    touch_all_softlockup_watchdogs();
    - if (!state_filter || (p->state & state_filter))
    + if (state_filter_match(state_filter, p))
    sched_show_task(p);
    }


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