Re: [PATCH] sched/cache: Check reduced capacity before alb_break_llc()

[Zhan Xusheng <zhanxusheng1024@gmail.com>]

Hi Kayra,

On Thu, Oct 29, 2026 at 10:13:10AM +0300, Kayra Cizmeci wrote:
> Well yeah. alb_break_llc() just returns true in the nr_running <= 1
> case. FWIW, on my tip tree this just creates a conflict. On me
> alb_break_llc() is first, then asym_active_balance() and then
> imbalanced_active_balance(). I think in that case moving all three
> functions would be better? (below this other block that's for this case)

That's sched/core, which doesn't have ee92b7ef4c1e ("sched/cache: Honor
asym packing over cache aware scheduling on hybrid systems") yet.  The
patch is on top of it and applies to tip/master.

Only alb_break_llc() needs to go below the capacity check, as it is the
only one that returns 0.  The other two only return 1, so where they
sit relative to the capacity check doesn't matter.
imbalanced_active_balance() moves only to stay behind alb_break_llc().

Thanks,
Zhan Xusheng