Re: [PATCH -v5][RFC]: mutex: implement adaptive spinning

[Ingo Molnar]

* Gregory Haskins <ghaskins@xxxxxxxxxx> wrote:

> Can I ask a simple question in light of all this discussion?
> 
> "Is get_task_struct() really that bad?"

it dirties a cacheline and it also involves atomics.

Also, it's a small design cleanliness issue to me: get_task_struct() 
impacts the lifetime of an object - and if a locking primitive has 
side-effects on object lifetimes that's never nice.

	Ingo

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