On Wed, Aug 30, 2017 at 11:12:23AM +0200, Peter Zijlstra wrote: > On Wed, Aug 30, 2017 at 06:01:59PM +0900, Byungchul Park wrote: > > My point is that we inevitably lose valuable dependencies by yours. That's > > why I've endlessly asked you 'do you have any reason you try those patches?' > > a ton of times. And you have never answered it. > > The only dependencies that are lost are those between the first work and > the setup of the workqueue thread. > > And there obviously _should_ not be any dependencies between those. A > work should not depend on the setup of the thread.
Furthermore, the save/restore can't preserve those dependencies. The moment a work exhausts xhlocks[] they are gone. So by assuming the first work _will_ exhaust the history there is effectively nothing lost.
