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authorPeter Zijlstra <peterz@infradead.org>2017-09-22 18:32:41 +0200
committerIngo Molnar <mingo@kernel.org>2017-09-29 11:02:57 +0200
commit5d68cc95fb24b2f58060cc5340dd7402a11f054e (patch)
treee2a02dfdf60f14623768495d3eda6695116425df /kernel
parent06eb61844d841d0032a9950ce7f8e783ee49c0d0 (diff)
download96b-common-5d68cc95fb24b2f58060cc5340dd7402a11f054e.tar.gz
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>
Diffstat (limited to 'kernel')
-rw-r--r--kernel/sched/core.c24
1 files changed, 23 insertions, 1 deletions
diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index 18a6966567da..d17c5da523a0 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -5166,6 +5166,28 @@ void sched_show_task(struct task_struct *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)
{
struct task_struct *g, *p;
@@ -5188,7 +5210,7 @@ void show_state_filter(unsigned long state_filter)
*/
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);
}