From: Andrew Morton <akpm@linux-foundation.org>
To: Jan Kara <jack@suse.cz>
Cc: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>,
LKML <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH v3] printk: Avoid softlockups in console_unlock()
Date: Fri, 1 Mar 2013 13:43:21 -0800 [thread overview]
Message-ID: <20130301134321.85e18987.akpm@linux-foundation.org> (raw)
In-Reply-To: <20130301103027.GC26128@quack.suse.cz>
On Fri, 1 Mar 2013 11:30:27 +0100
Jan Kara <jack@suse.cz> wrote:
> > If a CPU remains in your loop where you invoke rcu_cpu_stall_reset(),
> > there is no indication of the stall. Now, I do understand why having
> > RCU add a CPU stall warning into the mix would be very bad, but it
> > would be good to have some sort of indication that there is stalling.
> > Perhaps a counter visible in sysfs? Whatever it is, at least some way
> > of diagnosing the stall condition would be very good.
> I see. If others (Andrew, ping?) are OK with the rest of the patch, I can
> extend it and add a counter of printk() breaks we had to make. That looks
> like a good idea.
hmpf, spose so. It sound lke the world's least interesting counter but
perhaps it will look more interesting when we see its sparkly
documentation.
next prev parent reply other threads:[~2013-03-01 21:43 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-02-27 1:16 [PATCH v3] printk: Avoid softlockups in console_unlock() Jan Kara
2013-02-27 17:59 ` Paul E. McKenney
2013-03-01 10:30 ` Jan Kara
2013-03-01 21:43 ` Andrew Morton [this message]
2013-03-01 21:53 ` Paul E. McKenney
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