[PATCH 0/3] drm/ttm: hard to swim in an empty pool

Jérôme Glisse j.glisse at gmail.com
Tue Aug 12 20:52:03 PDT 2014

So it seems there was several issue with the various ttm pool. The obvious
one is fixed in patch 2 where the always empty pool syndrom is addressed.
However the pool size are kind of crazy and because before some pool were
never actualy fill we might never have experience the hill effect of the
crazy maximum limit. This is what is addressed by first patch.

Last patch cook it up further so that under memory pressure the pool size
is divided by 2 each time a shrinker is run on a pool. There is a timeout
to restore the pool size on next allocation. Idea here is that memory should
not last and if it last then shrinker will keep minimize the pool size and
anyway thing are probably already sluggish once we it the shrinker path.

Of course because this fix thing in ttm memory allocation this need careful
testing. So before pushing anything i would like to see more people testing


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