Re: Udpated sys_membarrier() speedup patch, FYI

Avi Kivity
2017-07-31T08:54:05Z

On 07/31/2017 11:37 AM, Peter Zijlstra wrote:
> On Mon, Jul 31, 2017 at 09:03:09AM +0300, Avi Kivity wrote:
>> I remembered that current->mm does not change when switching to a kernel
>> task, but my Kernlish is very rusty, or maybe it has changed.
> kernel threads do indeed preserve the mm of the old userspace task, but
> we track that in ->active_mm. Their ->mm will be NULL.

Gah, I'm so rusty, if I were any rustier I'd be doing bitcoin.