linux-kernel - [PATCH] sched: don't dump sched debug info in SysRq-W

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Date:	Mon,  4 Apr 2016 15:42:02 +0200
From:	Rabin Vincent <rabin.vincent@...s.com>
To:	mingo@...hat.com, peterz@...radead.org
Cc:	linux-kernel@...r.kernel.org, Rabin Vincent <rabinv@...s.com>
Subject: [PATCH] sched: don't dump sched debug info in SysRq-W

From: Rabin Vincent <rabinv@...s.com>

sysrq_sched_debug_show() can dump a lot of information.  Don't print out
all that if we're just trying to get a list of blocked tasks (SysRq-W).
The information is still accessible with SysRq-T.

Signed-off-by: Rabin Vincent <rabinv@...s.com>
---
 kernel/sched/core.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index 8b489fc..e330d6c 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -4998,7 +4998,8 @@ void show_state_filter(unsigned long state_filter)
 	touch_all_softlockup_watchdogs();
 
 #ifdef CONFIG_SCHED_DEBUG
-	sysrq_sched_debug_show();
+	if (!state_filter)
+		sysrq_sched_debug_show();
 #endif
 	rcu_read_unlock();
 	/*
-- 
2.7.0