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sched/debug: 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>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Peter Zijlstra 2017-09-22 18:32:41 +02:00 committed by Ingo Molnar
parent 06eb61844d
commit 5d68cc95fb
1 changed files with 23 additions and 1 deletions
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24
kernel/sched/core.c
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@ -5166,6 +5166,28 @@ void sched_show_task(struct task_struct *p)
put_task_stack(p); 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) void show_state_filter(unsigned long state_filter)
{ {
struct task_struct *g, *p; struct task_struct *g, *p;
@ -5188,7 +5210,7 @@ void show_state_filter(unsigned long state_filter)
*/ */
touch_nmi_watchdog(); touch_nmi_watchdog();
touch_all_softlockup_watchdogs(); touch_all_softlockup_watchdogs();
if (!state_filter || (p->state & state_filter)) if (state_filter_match(state_filter, p))
sched_show_task(p); sched_show_task(p);
} }