On Sat, 2021-07-03 at 17:47 +0200, Mike Galbraith wrote:

On Sat, 2021-07-03 at 09:24 +0200, Mike Galbraith wrote:

quoted

It also appears to be saying that there's something RT specific to
stare at in addition to the list_lock business.

The what is ___slab_alloc() consuming 3.9% CPU in tip-rt-slub whereas
it consumes < 1% in both tip-rt (sans slub patches) and tip-slub.

The why remains to ponder.

Ignoring odd distribution in the profile (red herring whackable via
prefetch games), and removing perf/debug options from the picture, the
remaining RT specific cost is just that of forced slow path.  For
hackbench in my little box, it adds up to right at 3%.

	-Mike