Re: [PATCH v3 2/2] memcg: punt high overage reclaim to return-to-userland path

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Hello,

On Tue, Sep 15, 2015 at 06:12:18PM +0200, Johannes Weiner wrote:
> But they have been failing indefinitely forever once you hit the hard
> limit in the past. There was never an async reclaim provision there.
>
> I can definitely see that the unconstrained high limit breaching needs
> to be fixed one way or another, I just don't quite understand why you
> chose to go for new semantics. Is there a new or a specific usecase
> you had in mind when you chose deferred reclaim over simply failing?

Hmmm... so if we just fail, it breaks the assumptions that slab/slub
is making and while they might not fail outright would behave in an
undesirable way.  It's just that we didn't notice that before with
limit_on_bytes and at least on the v2 interface the distinction
between high and max makes the problem easy to deal with from high
enforcement.

Thanks.

-- 
tejun
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