2016-04-04 13:42:09

by Rabin Vincent

[permalink] [raw]
Subject: [PATCH] sched: don't dump sched debug info in SysRq-W

From: Rabin Vincent <[email protected]>

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 <[email protected]>
---
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


Subject: [tip:sched/core] sched/debug: Don't dump sched debug info in SysRq-W

Commit-ID: fb90a6e93c0684ab2629a42462400603aa829b9c
Gitweb: http://git.kernel.org/tip/fb90a6e93c0684ab2629a42462400603aa829b9c
Author: Rabin Vincent <[email protected]>
AuthorDate: Mon, 4 Apr 2016 15:42:02 +0200
Committer: Ingo Molnar <[email protected]>
CommitDate: Wed, 13 Apr 2016 11:23:21 +0200

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

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 <[email protected]>
Cc: Linus Torvalds <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Steven Rostedt <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Ingo Molnar <[email protected]>
---
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 1159423..06efbb9 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -5050,7 +5050,8 @@ 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();
/*