linux-kernel - Re: [RFC][PATCH] sched: Cache aware load-balancing

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Message-ID: <20250326104627.GC12071@noisy.programming.kicks-ass.net>
Date: Wed, 26 Mar 2025 11:46:27 +0100
From: Peter Zijlstra <peterz@...radead.org>
To: "Chen, Yu C" <yu.c.chen@...el.com>
Cc: juri.lelli@...hat.com, vincent.guittot@...aro.org,
	dietmar.eggemann@....com, rostedt@...dmis.org, bsegall@...gle.com,
	mgorman@...e.de, vschneid@...hat.com, linux-kernel@...r.kernel.org,
	tim.c.chen@...ux.intel.com, tglx@...utronix.de, len.brown@...el.com,
	gautham.shenoy@....com, mingo@...nel.org, kprateek.nayak@....com,
	yu.chen.surf@...mail.com
Subject: Re: [RFC][PATCH] sched: Cache aware load-balancing

On Wed, Mar 26, 2025 at 11:25:53AM +0100, Peter Zijlstra wrote:
> On Wed, Mar 26, 2025 at 10:38:41AM +0100, Peter Zijlstra wrote:
> 
> > Nah, the saner thing to do is to preserve the topology averages and look
> > at those instead of the per-cpu values.
> > 
> > Eg. have task_cache_work() compute and store averages in the
> > sched_domain structure and then use those.
> 
> A little something like so perhaps ?

Oh urgh, ignore all that, I'm an idiot.

The numbers are per process, can't stick them in global structures.

I remember going through all this before :-/ Its just so very tempting
since its the right structure and everything, but we need it per
process :-(