Re: kswapd craziness in 3.7

[Rik van Riel]

On 11/27/2012 03:58 PM, Linus Torvalds wrote:
> Note that in the meantime, I've also applied (through Andrew) the
> patch that reverts commit c654345924f7 (see commit 82b212f40059
> 'Revert "mm: remove __GFP_NO_KSWAPD"').
>
> I wonder if that revert may be bogus, and a result of this same issue.
> Maybe that revert should be reverted, and replaced with your patch?
>
> Mel? Zdenek? What's the status here?

Mel posted several patches to fix the kswapd issue.  This one is
slightly more risky than the outright revert, but probably preferred
from a performance point of view:

https://lkml.org/lkml/2012/11/12/151

It works by skipping the kswapd wakeup for THP allocations, only
if compaction is deferred or contended.

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