Re: Subtle MM bug

[H. Peter Anvin]

Followup to:  <[e-mail]>
By author:    Rik van Riel <[e-mail]>
In newsgroup: linux.dev.kernel
> 
> Suppose you have 8 high-priority tasks waiting on kswapd
> and one lower-priority (but still higher than kswapd)
> process running and preventing kswapd from doing its work.
> Oh .. and also preventing the higher-priority tasks from
> being woken up and continuing...
> 

Classic priority inversion.  In this particular case it seems like it
should be unusually simple to apply priority inheritance, though (the
general case is complicated by the fact that the dependency matrix
usually isn't readily available.)

	-hpa
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