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authorPeter Zijlstra <a.p.zijlstra@chello.nl>2012-02-27 10:47:00 +0100
committerIngo Molnar <mingo@elte.hu>2012-03-12 20:43:16 +0100
commit3ccf3e8306156a28213adc720aba807e9a901ad5 (patch)
tree5b9db344b702299ea7eb53fbff3d0d74707d40ec /kernel/sched
parent554cecaf733623b327eef9652b65965eb1081b81 (diff)
printk/sched: Introduce special printk_sched() for those awkward moments
There's a few awkward printk()s inside of scheduler guts that people prefer to keep but really are rather deadlock prone. Fudge around it by storing the text in a per-cpu buffer and poll it using the existing printk_tick() handler. This will drop output when its more frequent than once a tick, however only the affinity thing could possible go that fast and for that just one should suffice to notify the admin he's done something silly.. Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Andrew Morton <akpm@linux-foundation.org> Link: http://lkml.kernel.org/n/tip-wua3lmkt3dg8nfts66o6brne@git.kernel.org Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'kernel/sched')
-rw-r--r--kernel/sched/core.c2
-rw-r--r--kernel/sched/rt.c8
2 files changed, 8 insertions, 2 deletions
diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index b1ccce819ce..8781cec7c3e 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -1284,7 +1284,7 @@ static int select_fallback_rq(int cpu, struct task_struct *p)
* leave kernel.
*/
if (p->mm && printk_ratelimit()) {
- printk(KERN_INFO "process %d (%s) no longer affine to cpu%d\n",
+ printk_sched("process %d (%s) no longer affine to cpu%d\n",
task_pid_nr(p), p->comm, cpu);
}
diff --git a/kernel/sched/rt.c b/kernel/sched/rt.c
index 7f7e7cdcb47..b60dad72017 100644
--- a/kernel/sched/rt.c
+++ b/kernel/sched/rt.c
@@ -864,8 +864,14 @@ static int sched_rt_runtime_exceeded(struct rt_rq *rt_rq)
* but accrue some time due to boosting.
*/
if (likely(rt_b->rt_runtime)) {
+ static bool once = false;
+
rt_rq->rt_throttled = 1;
- printk_once(KERN_WARNING "sched: RT throttling activated\n");
+
+ if (!once) {
+ once = true;
+ printk_sched("sched: RT throttling activated\n");
+ }
} else {
/*
* In case we did anyway, make it go away,