Re: [PATCH v2 2/3] mutex: add support for reservation style locks, v2

Peter Zijlstra
2013-04-04T16:39:51Z

On Thu, 2013-04-04 at 15:31 +0200, Daniel Vetter wrote:
> The trick with the current code is that the oldest task
> will never see an -EAGAIN ever and hence is guaranteed to make forward
> progress. If the task is really unlucky though it might be forced to
> wait
> for a younger task for every ww_mutex it tries to acquire.

Agreed on that.. while I didn't state this my proposed thing should
behave the same. It follows from the symmetry breaking in that only
younger tasks can get 'kill'ed.