linux-kernel - Re: [PATCH v2 01/23] sched/cache: Introduce infrastructure for cache-aware load balancing

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Message-ID: <20251210151132.GK3707837@noisy.programming.kicks-ass.net>
Date: Wed, 10 Dec 2025 16:11:32 +0100
From: Peter Zijlstra <peterz@...radead.org>
To: "Chen, Yu C" <yu.c.chen@...el.com>
Cc: Tim Chen <tim.c.chen@...ux.intel.com>, Ingo Molnar <mingo@...hat.com>,
	K Prateek Nayak <kprateek.nayak@....com>,
	"Gautham R . Shenoy" <gautham.shenoy@....com>,
	Vincent Guittot <vincent.guittot@...aro.org>,
	Juri Lelli <juri.lelli@...hat.com>,
	Dietmar Eggemann <dietmar.eggemann@....com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Ben Segall <bsegall@...gle.com>, Mel Gorman <mgorman@...e.de>,
	Valentin Schneider <vschneid@...hat.com>,
	Madadi Vineeth Reddy <vineethr@...ux.ibm.com>,
	Hillf Danton <hdanton@...a.com>,
	Shrikanth Hegde <sshegde@...ux.ibm.com>,
	Jianyong Wu <jianyong.wu@...look.com>,
	Yangyu Chen <cyy@...self.name>,
	Tingyin Duan <tingyin.duan@...il.com>,
	Vern Hao <vernhao@...cent.com>, Vern Hao <haoxing990@...il.com>,
	Len Brown <len.brown@...el.com>, Aubrey Li <aubrey.li@...el.com>,
	Zhao Liu <zhao1.liu@...el.com>, Chen Yu <yu.chen.surf@...il.com>,
	Adam Li <adamli@...amperecomputing.com>,
	Aaron Lu <ziqianlu@...edance.com>, Tim Chen <tim.c.chen@...el.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 01/23] sched/cache: Introduce infrastructure for
 cache-aware load balancing

On Wed, Dec 10, 2025 at 10:57:27PM +0900, Chen, Yu C wrote:
> On 12/10/2025 6:37 PM, Peter Zijlstra wrote:
> > On Wed, Dec 03, 2025 at 03:07:20PM -0800, Tim Chen wrote:
> > 
> > > +static unsigned long __no_profile fraction_mm_sched(struct rq *rq, struct mm_sched *pcpu_sched)
> > 
> > > +static void __no_profile task_cache_work(struct callback_head *work)
> > 
> > What's with the random __no_profile things?
> 
> In the early version without this tag we got some error reports by gcov.
> We will check if this issue still exists and do some investigations.

That would be weird, nothing in the scheduler has anything like it. So
yeah, please see if you can find out where that came from.