On Tue, Sep 21, 2021 at 09:31:30AM +1000, NeilBrown wrote:

On Mon, 20 Sep 2021, Mel Gorman wrote:

quoted

+
+		reclaim_throttle(pgdat, VMSCAN_THROTTLE_NOPROGRESS, HZ/10);

We always seem to pass "HZ/10" to reclaim_throttle().  Should we just
hard-code that in the one place inside reclaim_throttle() itself?

do_writepages passes in HZ/50. I'm not sure if these values even have
any special meaning, I think it's more likely they were pulled out of
the air based on the speed of some disk in the past and then copied.
It's another reason why I want the wakeups to be based on events within
the mm as much as possible.

-- 
Mel Gorman
SUSE Labs