sched/debug: Don't dump sched debug info in SysRq-W

commit fb90a6e93c0684ab2629a42462400603aa829b9c upstream.

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@axis.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/1459777322-30902-1-git-send-email-rabin.vincent@axis.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Cc: Nikolay Borisov <n.borisov.lkml@gmail.com>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>

diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index fe080adbe5a8f0c58215358a526b4ee6926a4a15..426193802b1feddd03730e75ea48b84e23d40bdb 100644 (file)
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -4233,7 +4233,8 @@ 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();
        /*