Re: [RFC] Notifier for Externally Mapped Memory (EMM)

Avi Kivity
2008-03-05T05:13:23Z

Peter Zijlstra wrote:
> On Tue, 2008-03-04 at 14:35 -0800, Christoph Lameter wrote:
>
>
>> RCU means that the callbacks occur in an atomic context.
>>
>
> Not really, if it requires moving the VM locks to sleepable locks under
> a .config option, I think its also fair to require PREEMPT_RCU.
>
> OTOH, if you want to unconditionally move the VM locks to sleepable
> locks you have a point.
>

Isn't that out of the question for .25?

I really wish we can get the atomic variant in now, and add on
sleepability in .26, updating users if necessary.

--
Do not meddle in the internals of kernels, for they are subtle and quick to panic.