linux-kernel - Re: [BUG] 2.6.31-rt10

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Date:	Thu, 17 Sep 2009 09:29:55 +0200 (CEST)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Knut Petersen <Knut_Petersen@...nline.de>
cc:	linux-kernel@...r.kernel.org
Subject: Re: [BUG] 2.6.31-rt10

Knut,

On Thu, 17 Sep 2009, Knut Petersen wrote:
> Hi Thomas!
> 
> Well, I thought it was a good idea to test the rt patch.
> Never did that before. Cyclictest output looked great, but then
> i tried to do some audio recording. I used "chrt 80 arecord ..."
> to record at 96kHz/16bit stereo from an RME Digi96/PAD.
> That seemed to work fine on an idle machine. So I put
> some extra load on the machine. A "make -j 16" kernel
> compilation locks keyboard and screen within minutes,
> no matter if X is running or not. The attached part of
> /var/log/messages shows two of those events - I deleted all
> but the very first log entries.

Duh, never used latencytop on RT. Patch below should fix that.

Thanks,

	tglx
---
diff --git a/kernel/latencytop.c b/kernel/latencytop.c
index ca07c5c..34311e1 100644
--- a/kernel/latencytop.c
+++ b/kernel/latencytop.c
@@ -59,7 +59,7 @@
 #include <linux/slab.h>
 #include <linux/stacktrace.h>
 
-static DEFINE_SPINLOCK(latency_lock);
+static DEFINE_ATOMIC_SPINLOCK(latency_lock);
 
 #define MAXLR 128
 static struct latency_record latency_record[MAXLR];
@@ -73,19 +73,19 @@ void clear_all_latency_tracing(struct task_struct *p)
 	if (!latencytop_enabled)
 		return;
 
-	spin_lock_irqsave(&latency_lock, flags);
+	atomic_spin_lock_irqsave(&latency_lock, flags);
 	memset(&p->latency_record, 0, sizeof(p->latency_record));
 	p->latency_record_count = 0;
-	spin_unlock_irqrestore(&latency_lock, flags);
+	atomic_spin_unlock_irqrestore(&latency_lock, flags);
 }
 
 static void clear_global_latency_tracing(void)
 {
 	unsigned long flags;
 
-	spin_lock_irqsave(&latency_lock, flags);
+	atomic_spin_lock_irqsave(&latency_lock, flags);
 	memset(&latency_record, 0, sizeof(latency_record));
-	spin_unlock_irqrestore(&latency_lock, flags);
+	atomic_spin_unlock_irqrestore(&latency_lock, flags);
 }
 
 static void __sched
@@ -191,7 +191,7 @@ __account_scheduler_latency(struct task_struct *tsk, int usecs, int inter)
 	lat.max = usecs;
 	store_stacktrace(tsk, &lat);
 
-	spin_lock_irqsave(&latency_lock, flags);
+	atomic_spin_lock_irqsave(&latency_lock, flags);
 
 	account_global_scheduler_latency(tsk, &lat);
 
@@ -233,7 +233,7 @@ __account_scheduler_latency(struct task_struct *tsk, int usecs, int inter)
 	memcpy(&tsk->latency_record[i], &lat, sizeof(struct latency_record));
 
 out_unlock:
-	spin_unlock_irqrestore(&latency_lock, flags);
+	atomic_spin_unlock_irqrestore(&latency_lock, flags);
 }
 
 static int lstats_show(struct seq_file *m, void *v)

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