Re: swapper: page allocation failure. order:3, mode:0x20

[Anton Blanchard <anton _at_ xxxxxxxxx>]

> This seems a bit odd.  It means that the further apart the message bursts
> are, the longer they are allowed to be.  Or something.
>
> Wouldn't it be better to say "after each greater-than-five second window,
> allow up to ten printk's as long as they happen in the next five
> milliseconds"?

Its 100% copied from the networking code. I would have thought we really
want that behaviour, if Im on a serial console I can only tolerate a
decent sized backtrace every few seconds. If I allow 10 bursts every 5
seconds then im screwed.

Instead we allow the burst of 10 once but then ratelimit it to one
per 5 seconds until we have had a long enough period of silence. The
main thing is that over the long term we have an average of one message
per 5 seconds.

Anton
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