From: Shrikanth Hegde <sshegde@linux.ibm.com>
To: Peter Zijlstra <peterz@infradead.org>,
"Chen, Yu C" <yu.c.chen@intel.com>
Cc: 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 14:24:40 +0530 [thread overview]
Message-ID: <bef73a72-a75d-4c10-9b60-ff16990a682e@linux.ibm.com> (raw)
In-Reply-To: <20250704084547.GF2001818@noisy.programming.kicks-ass.net>
On 7/4/25 14:15, Peter Zijlstra wrote:
> 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.
>
Ok Makes sense.
next prev parent reply other threads:[~2025-07-04 8:55 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
2025-07-04 8:54 ` Shrikanth Hegde [this message]
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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