From: Peter Zijlstra <peterz@infradead.org>
To: "Chen, Yu C" <yu.c.chen@intel.com>
Cc: Shrikanth Hegde <sshegde@linux.ibm.com>,
Juri Lelli <juri.lelli@redhat.com>,
Dietmar Eggemann <dietmar.eggemann@arm.com>,
Steven Rostedt <rostedt@goodmis.org>,
Ben Segall <bsegall@google.com>, Mel Gorman <mgorman@suse.de>,
Valentin Schneider <vschneid@redhat.com>,
Tim Chen <tim.c.chen@intel.com>,
Vincent Guittot <vincent.guittot@linaro.org>,
Libo Chen <libo.chen@oracle.com>,
Abel Wu <wuyun.abel@bytedance.com>,
Madadi Vineeth Reddy <vineethr@linux.ibm.com>,
Hillf Danton <hdanton@sina.com>, Len Brown <len.brown@intel.com>,
linux-kernel@vger.kernel.org, Ingo Molnar <mingo@redhat.com>,
K Prateek Nayak <kprateek.nayak@amd.com>,
"Gautham R . Shenoy" <gautham.shenoy@amd.com>,
Tim Chen <tim.c.chen@linux.intel.com>
Subject: Re: [RFC patch v3 01/20] sched: Cache aware load-balancing
Date: Fri, 4 Jul 2025 10:45:47 +0200 [thread overview]
Message-ID: <20250704084547.GF2001818@noisy.programming.kicks-ass.net> (raw)
In-Reply-To: <ba7f6c16-919a-4261-8677-056072572fc9@intel.com>
On Fri, Jul 04, 2025 at 04:40:39PM +0800, Chen, Yu C wrote:
> > > @@ -953,6 +953,10 @@ config NUMA_BALANCING
> > > ?????????????? This system will be inactive on UMA systems.
> > > +config SCHED_CACHE
> > > +?????? bool "Cache aware scheduler"
> > > +?????? default y
> > > +
> >
> > Should it depend on EXPERT?
> > IMO this could add quite a bit of overhead and maybe n by default?
> >
>
> I would leave this to Peter and Tim to decide.
Runtime controls are always better than compile time. Distros will have
no choice but to enable the config option.
But that is not the kind of thing you start a series with. First
versions didn't even have the config option. First you make it work,
then later you worry about silly detail.
next prev parent reply other threads:[~2025-07-04 8:46 UTC|newest]
Thread overview: 68+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-06-18 18:27 [RFC patch v3 00/20] Cache aware scheduling Tim Chen
2025-06-18 18:27 ` [RFC patch v3 01/20] sched: Cache aware load-balancing Tim Chen
2025-06-26 12:23 ` Jianyong Wu
2025-06-26 13:32 ` Chen, Yu C
2025-06-27 0:10 ` Tim Chen
2025-06-27 2:13 ` Jianyong Wu
2025-07-03 19:29 ` Shrikanth Hegde
2025-07-04 8:40 ` Chen, Yu C
2025-07-04 8:45 ` Peter Zijlstra [this message]
2025-07-04 8:54 ` Shrikanth Hegde
2025-07-07 19:57 ` Tim Chen
2025-06-18 18:27 ` [RFC patch v3 02/20] sched: Several fixes for cache aware scheduling Tim Chen
2025-07-03 19:33 ` Shrikanth Hegde
2025-07-07 21:02 ` Tim Chen
2025-07-08 1:15 ` Libo Chen
2025-07-08 7:54 ` Chen, Yu C
2025-07-08 15:47 ` Libo Chen
2025-06-18 18:27 ` [RFC patch v3 03/20] sched: Avoid task migration within its preferred LLC Tim Chen
2025-06-18 18:27 ` [RFC patch v3 04/20] sched: Avoid calculating the cpumask if the system is overloaded Tim Chen
2025-07-03 19:39 ` Shrikanth Hegde
2025-07-07 14:57 ` Tim Chen
2025-06-18 18:27 ` [RFC patch v3 05/20] sched: Add hysteresis to switch a task's preferred LLC Tim Chen
2025-07-02 6:47 ` Madadi Vineeth Reddy
2025-07-02 21:47 ` Tim Chen
2025-06-18 18:27 ` [RFC patch v3 06/20] sched: Save the per LLC utilization for better cache aware scheduling Tim Chen
2025-06-18 18:27 ` [RFC patch v3 07/20] sched: Add helper function to decide whether to allow " Tim Chen
2025-07-08 0:41 ` Libo Chen
2025-07-08 8:29 ` Chen, Yu C
2025-07-08 17:22 ` Libo Chen
2025-07-09 14:41 ` Chen, Yu C
2025-07-09 21:31 ` Libo Chen
2025-07-08 21:59 ` Tim Chen
2025-07-09 21:22 ` Libo Chen
2025-06-18 18:27 ` [RFC patch v3 08/20] sched: Set up LLC indexing Tim Chen
2025-07-03 19:44 ` Shrikanth Hegde
2025-07-04 9:36 ` Chen, Yu C
2025-06-18 18:27 ` [RFC patch v3 09/20] sched: Introduce task preferred LLC field Tim Chen
2025-06-18 18:27 ` [RFC patch v3 10/20] sched: Calculate the number of tasks that have LLC preference on a runqueue Tim Chen
2025-07-03 19:45 ` Shrikanth Hegde
2025-07-04 15:00 ` Chen, Yu C
2025-06-18 18:27 ` [RFC patch v3 11/20] sched: Introduce per runqueue task LLC preference counter Tim Chen
2025-06-18 18:28 ` [RFC patch v3 12/20] sched: Calculate the total number of preferred LLC tasks during load balance Tim Chen
2025-06-18 18:28 ` [RFC patch v3 13/20] sched: Tag the sched group as llc_balance if it has tasks prefer other LLC Tim Chen
2025-06-18 18:28 ` [RFC patch v3 14/20] sched: Introduce update_llc_busiest() to deal with groups having preferred LLC tasks Tim Chen
2025-07-03 19:52 ` Shrikanth Hegde
2025-07-05 2:26 ` Chen, Yu C
2025-06-18 18:28 ` [RFC patch v3 15/20] sched: Introduce a new migration_type to track the preferred LLC load balance Tim Chen
2025-06-18 18:28 ` [RFC patch v3 16/20] sched: Consider LLC locality for active balance Tim Chen
2025-06-18 18:28 ` [RFC patch v3 17/20] sched: Consider LLC preference when picking tasks from busiest queue Tim Chen
2025-06-18 18:28 ` [RFC patch v3 18/20] sched: Do not migrate task if it is moving out of its preferred LLC Tim Chen
2025-06-18 18:28 ` [RFC patch v3 19/20] sched: Introduce SCHED_CACHE_LB to control cache aware load balance Tim Chen
2025-06-18 18:28 ` [RFC patch v3 20/20] sched: Introduce SCHED_CACHE_WAKE to control LLC aggregation on wake up Tim Chen
2025-06-19 6:39 ` [RFC patch v3 00/20] Cache aware scheduling Yangyu Chen
2025-06-19 13:21 ` Chen, Yu C
2025-06-19 14:12 ` Yangyu Chen
2025-06-20 19:25 ` Madadi Vineeth Reddy
2025-06-22 0:39 ` Chen, Yu C
2025-06-24 17:47 ` Madadi Vineeth Reddy
2025-06-23 16:45 ` Tim Chen
2025-06-24 5:00 ` K Prateek Nayak
2025-06-24 12:16 ` Chen, Yu C
2025-06-25 4:19 ` K Prateek Nayak
2025-06-25 0:30 ` Tim Chen
2025-06-25 4:30 ` K Prateek Nayak
2025-07-03 20:00 ` Shrikanth Hegde
2025-07-04 10:09 ` Chen, Yu C
2025-07-09 19:39 ` Madadi Vineeth Reddy
2025-07-10 3:33 ` Chen, Yu C
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