On Tue, 2022-05-10 at 11:05 -0700, Linus Torvalds wrote:
[ Adding locking people in case they have any input ]The referenced regression report is very old (in Feb 2015 for 3.16-
On Mon, May 9, 2022 at 11:23 PM ying.huang@xxxxxxxxx
<ying.huang@xxxxxxxxx> wrote:
+Can you point me to the regression report? I would like to take a look,https://lore.kernel.org/all/1425108604.10337.84.camel@xxxxxxxxxxxxxxx/
thanks.
Hmm.
That explanation looks believable, except that our qspinlocks
shouldn't be spinning on the lock itself, but spinning on the mcs node
it inserts into the lock.
3.17). The ticket spinlock was still used at that time. I believe that
things become much better after we used qspinlock. We can test that.