From: K Prateek Nayak <kprateek.nayak@amd.com>
To: "Chen, Yu C" <yu.c.chen@intel.com>,
Tim Chen <tim.c.chen@linux.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>,
Madadi Vineeth Reddy <vineethr@linux.ibm.com>,
"Hillf Danton" <hdanton@sina.com>,
Shrikanth Hegde <sshegde@linux.ibm.com>,
Jianyong Wu <jianyong.wu@outlook.com>,
Yangyu Chen <cyy@cyyself.name>,
Tingyin Duan <tingyin.duan@gmail.com>,
Vern Hao <vernhao@tencent.com>, "Vern Hao" <haoxing990@gmail.com>,
Len Brown <len.brown@intel.com>, Aubrey Li <aubrey.li@intel.com>,
Zhao Liu <zhao1.liu@intel.com>, Chen Yu <yu.chen.surf@gmail.com>,
Adam Li <adamli@os.amperecomputing.com>,
Aaron Lu <ziqianlu@bytedance.com>,
Tim Chen <tim.c.chen@intel.com>, Josh Don <joshdon@google.com>,
Gavin Guo <gavinguo@igalia.com>,
Qais Yousef <qyousef@layalina.io>,
Libo Chen <libchen@purestorage.com>,
<linux-kernel@vger.kernel.org>,
Peter Zijlstra <peterz@infradead.org>,
"Gautham R . Shenoy" <gautham.shenoy@amd.com>,
Vincent Guittot <vincent.guittot@linaro.org>,
Ingo Molnar <mingo@redhat.com>
Subject: Re: [PATCH v3 04/21] sched/cache: Make LLC id continuous
Date: Wed, 18 Feb 2026 23:16:15 +0530 [thread overview]
Message-ID: <be8d4efa-e29a-4463-a7fc-50320aebf1cd@amd.com> (raw)
In-Reply-To: <f891e7d3-98d1-4590-9335-f12225407fd6@intel.com>
Hello Chenyu,
On 2/18/2026 8:52 PM, Chen, Yu C wrote:
>> On a separate note, if we add a dependency on SCHED_MC for SCHED_CACHE,
>> we can simply look at cpu_coregroup_mask() and either allocate a new
>> llc_id / borrow llc id in sched_cpu_activate() when CPU is onlined or
>> reassign them in sched_cpu_deactivate() if an entire LLC is offlined.
>>
>
> Prateek, may I know if you are thinking of updating every CPU's LLC id
> during its hotplug and not update all percpu LLC id in build_sched_domains()?
I was still thinking of build_sched_domains() (or somewhere in the
online and offline path) where we can first simply look at
cpu_coregroup_mask() and decide if we need to traverse all CPUs and
shuffle the IDs.
--
Thanks and Regards,
Prateek
next prev parent reply other threads:[~2026-02-18 17:46 UTC|newest]
Thread overview: 117+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-02-10 22:18 [PATCH v3 00/21] Cache Aware Scheduling Tim Chen
2026-02-10 22:18 ` [PATCH v3 01/21] sched/cache: Introduce infrastructure for cache-aware load balancing Tim Chen
2026-02-14 12:26 ` Madadi Vineeth Reddy
2026-02-14 15:34 ` Chen, Yu C
2026-02-17 18:51 ` Tim Chen
2026-02-10 22:18 ` [PATCH v3 02/21] sched/cache: Record per LLC utilization to guide cache aware scheduling decisions Tim Chen
2026-02-10 22:18 ` [PATCH v3 03/21] sched/cache: Introduce helper functions to enforce LLC migration policy Tim Chen
2026-02-14 16:12 ` Madadi Vineeth Reddy
2026-02-15 12:14 ` Chen, Yu C
2026-02-19 11:29 ` Peter Zijlstra
2026-02-19 14:48 ` Chen, Yu C
2026-02-19 14:55 ` Peter Zijlstra
2026-02-10 22:18 ` [PATCH v3 04/21] sched/cache: Make LLC id continuous Tim Chen
2026-02-14 17:53 ` Madadi Vineeth Reddy
2026-02-15 14:25 ` Chen, Yu C
2026-02-17 10:05 ` Madadi Vineeth Reddy
2026-02-17 21:20 ` Tim Chen
2026-02-16 7:44 ` K Prateek Nayak
2026-02-17 6:07 ` Chen, Yu C
2026-02-17 8:09 ` K Prateek Nayak
2026-02-17 23:12 ` Tim Chen
2026-02-18 3:28 ` K Prateek Nayak
2026-02-18 15:22 ` Chen, Yu C
2026-02-18 17:46 ` K Prateek Nayak [this message]
2026-02-18 23:21 ` Tim Chen
2026-02-19 6:12 ` K Prateek Nayak
2026-02-19 15:51 ` Peter Zijlstra
2026-02-20 0:11 ` Tim Chen
2026-02-19 11:25 ` Chen, Yu C
2026-02-19 16:10 ` K Prateek Nayak
2026-02-18 18:45 ` Tim Chen
2026-02-18 21:33 ` Tim Chen
2026-02-18 15:11 ` Chen, Yu C
2026-02-19 15:48 ` Peter Zijlstra
2026-02-20 15:22 ` Chen, Yu C
2026-02-19 15:40 ` Peter Zijlstra
2026-02-20 15:53 ` Chen, Yu C
2026-02-20 16:03 ` Peter Zijlstra
2026-02-20 16:10 ` Chen, Yu C
2026-02-20 19:24 ` Tim Chen
2026-02-20 19:30 ` Peter Zijlstra
2026-02-20 19:35 ` Tim Chen
2026-02-19 11:35 ` Peter Zijlstra
2026-02-19 18:17 ` Tim Chen
2026-02-19 14:59 ` Peter Zijlstra
2026-02-19 15:20 ` Chen, Yu C
2026-02-19 19:20 ` Tim Chen
2026-02-19 21:04 ` Tim Chen
2026-02-20 17:17 ` Chen, Yu C
2026-02-10 22:18 ` [PATCH v3 05/21] sched/cache: Assign preferred LLC ID to processes Tim Chen
2026-02-14 18:36 ` Madadi Vineeth Reddy
2026-02-16 6:58 ` Chen, Yu C
2026-02-10 22:18 ` [PATCH v3 06/21] sched/cache: Track LLC-preferred tasks per runqueue Tim Chen
2026-02-10 22:18 ` [PATCH v3 07/21] sched/cache: Introduce per CPU's tasks LLC preference counter Tim Chen
2026-02-20 10:45 ` Peter Zijlstra
2026-02-20 16:57 ` Chen, Yu C
2026-02-20 18:38 ` Peter Zijlstra
2026-02-10 22:18 ` [PATCH v3 08/21] sched/cache: Calculate the percpu sd task LLC preference Tim Chen
2026-02-20 11:02 ` Peter Zijlstra
2026-02-20 14:02 ` Peter Zijlstra
2026-02-20 17:25 ` Chen, Yu C
2026-02-10 22:18 ` [PATCH v3 09/21] sched/cache: Count tasks prefering destination LLC in a sched group Tim Chen
2026-02-20 12:52 ` Peter Zijlstra
2026-02-20 13:43 ` Peter Zijlstra
2026-02-21 2:53 ` Chen, Yu C
2026-02-10 22:18 ` [PATCH v3 10/21] sched/cache: Check local_group only once in update_sg_lb_stats() Tim Chen
2026-02-10 22:18 ` [PATCH v3 11/21] sched/cache: Prioritize tasks preferring destination LLC during balancing Tim Chen
2026-02-17 18:33 ` Madadi Vineeth Reddy
2026-02-17 21:45 ` Tim Chen
2026-02-10 22:18 ` [PATCH v3 12/21] sched/cache: Add migrate_llc_task migration type for cache-aware balancing Tim Chen
2026-02-10 22:18 ` [PATCH v3 13/21] sched/cache: Handle moving single tasks to/from their preferred LLC Tim Chen
2026-02-17 19:00 ` Madadi Vineeth Reddy
2026-02-17 22:04 ` Tim Chen
2026-02-20 13:53 ` Peter Zijlstra
2026-02-20 18:22 ` Tim Chen
2026-02-10 22:18 ` [PATCH v3 14/21] sched/cache: Respect LLC preference in task migration and detach Tim Chen
2026-02-18 9:14 ` Madadi Vineeth Reddy
2026-02-18 15:34 ` Chen, Yu C
2026-02-10 22:18 ` [PATCH v3 15/21] sched/cache: Disable cache aware scheduling for processes with high thread counts Tim Chen
2026-02-18 17:54 ` Madadi Vineeth Reddy
2026-02-18 21:44 ` Tim Chen
2026-02-19 2:28 ` Madadi Vineeth Reddy
2026-02-19 14:38 ` Chen, Yu C
2026-02-19 21:12 ` Tim Chen
2026-02-19 16:52 ` Peter Zijlstra
2026-02-20 7:02 ` Madadi Vineeth Reddy
2026-02-19 16:55 ` Peter Zijlstra
2026-02-20 6:40 ` Madadi Vineeth Reddy
2026-02-20 9:53 ` Peter Zijlstra
2026-02-24 9:42 ` Madadi Vineeth Reddy
2026-02-19 16:50 ` Peter Zijlstra
2026-02-19 21:06 ` Tim Chen
2026-02-10 22:18 ` [PATCH v3 16/21] sched/cache: Avoid cache-aware scheduling for memory-heavy processes Tim Chen
2026-02-10 22:18 ` [PATCH v3 17/21] sched/cache: Enable cache aware scheduling for multi LLCs NUMA node Tim Chen
2026-02-10 22:18 ` [PATCH v3 18/21] sched/cache: Allow the user space to turn on and off cache aware scheduling Tim Chen
2026-02-10 22:18 ` [PATCH v3 19/21] sched/cache: Add user control to adjust the aggressiveness of cache-aware scheduling Tim Chen
2026-02-20 14:29 ` Peter Zijlstra
2026-02-20 18:18 ` Tim Chen
2026-02-10 22:19 ` [PATCH v3 20/21] -- DO NOT APPLY!!! -- sched/cache/debug: Display the per LLC occupancy for each process via proc fs Tim Chen
2026-02-10 22:19 ` [PATCH v3 21/21] -- DO NOT APPLY!!! -- sched/cache/debug: Add ftrace to track the load balance statistics Tim Chen
2026-02-19 14:08 ` [PATCH v3 00/21] Cache Aware Scheduling Qais Yousef
2026-02-19 14:41 ` Peter Zijlstra
2026-02-19 15:07 ` Chen, Yu C
2026-02-19 18:11 ` Tim Chen
2026-02-20 3:29 ` Qais Yousef
2026-02-20 9:43 ` Peter Zijlstra
2026-02-24 2:49 ` Qais Yousef
2026-02-20 18:14 ` Tim Chen
2026-02-24 3:02 ` Qais Yousef
2026-02-20 3:25 ` Qais Yousef
2026-02-21 2:48 ` Chen, Yu C
2026-02-24 3:11 ` Qais Yousef
2026-02-19 19:48 ` Qais Yousef
2026-02-19 21:47 ` Tim Chen
2026-02-20 3:41 ` Qais Yousef
2026-02-20 8:45 ` Peter Zijlstra
2026-02-24 3:31 ` Qais Yousef
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