On Tue, 2 Dec 2008, Andrew Morton wrote:
quoted text
> On Mon, 1 Dec 2008 00:46:53 +0000 (GMT)
> Hugh Dickins <hugh@veritas.com> wrote:
> > +	/*
> > +	 * Allow a burst of 60 reports, then keep quiet for that minute;
> > +	 * or allow a steady drip of one report per second.
> > +	 */
> > +	if (nr_shown == 60) {
> > +		if (time_before(jiffies, resume)) {
> > +			nr_unshown++;
> > +			goto out;
> > +		}
> > +		if (nr_unshown) {
> > +			printk(KERN_EMERG
> > +				"Bad page state: %lu messages suppressed\n",
> > +				nr_unshown);
> > +			nr_unshown = 0;
> > +		}
> > +		nr_shown = 0;
> > +	}
> > +	if (nr_shown++ == 0)
> > +		resume = jiffies + 60 * HZ;
> > +
> 
> gee, that's pretty elaborate.  There's no way of using the
> possibly-enhanced ratelimit.h?

Thanks a lot for the pointer: I'd browsed around kernel/printk.c and
not found what I needed, hadn't realized there's a lib/ratelimit.c.

It looks eerily like what I'm trying to do, just a less specific
missed/suppressed message, never mind that.  I'll try making a patch
later to replace this (in its subsequent KERN_ALERT form) by that -
in doing so, perhaps I'll encounter a problem, but should be good.

Hugh
--
unsubscribe notice
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/