On Wed, Jan 13, 2021 at 7:15 PM Oscar Salvador [off-list ref] wrote:

On Wed, Jan 13, 2021 at 07:11:06PM +0800, Muchun Song wrote:

quoted

If there is no task to be scheduled. Here is just a while loop.
The cpu_relax is a good thing to insert into busy-wait loops,
right?

But if the race window is that small, does it make sense?

Actually, there is one exception. The race window could
become larger. If the page is freed via a workqueue (see
free_huge_page()). In this case, the cpu_relax() can
make sense. Right?

--
Oscar Salvador
SUSE L3