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

Ingo Molnar
2009-01-07T22:33:17Z

* Gregory Haskins <ghaskins@novell.com> 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