From: K Prateek Nayak <kprateek.nayak@amd.com>
To: Shrikanth Hegde <sshegde@linux.ibm.com>
Cc: <linux-kernel@vger.kernel.org>,
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>,
"Gautham R. Shenoy" <gautham.shenoy@amd.com>,
"Swapnil Sapkal" <swapnil.sapkal@amd.com>,
Chen Yu <yu.c.chen@intel.com>, Ingo Molnar <mingo@redhat.com>,
Peter Zijlstra <peterz@infradead.org>,
Juri Lelli <juri.lelli@redhat.com>,
Vincent Guittot <vincent.guittot@linaro.org>,
Anna-Maria Behnsen <anna-maria@linutronix.de>,
Frederic Weisbecker <frederic@kernel.org>,
Thomas Gleixner <tglx@linutronix.de>
Subject: Re: [RESEND RFC PATCH v2 00/29] sched/fair: Push-based load balancing
Date: Mon, 8 Dec 2025 23:06:49 +0530 [thread overview]
Message-ID: <5f31086f-3d55-4e16-9b0f-c8124de3ca80@amd.com> (raw)
In-Reply-To: <48ced285-f0d2-4da1-9955-12f9c4d7692d@linux.ibm.com>
Hello Shrikanth,
On 12/8/2025 7:34 PM, Shrikanth Hegde wrote:
>> 2. The "nohz.nr_idle" and "nohz.idle_cpus" are global system-wide
>> variables that can run into scalability bottlenecks on a large
>> core-count system.
>>
>
> I think they are nohz.nr_cpus and nohz.idle_cpus_mask. isn't it?
Ack! Sorry my brain is all mush at this point staring at all the new
and old "nohz.*" variable names. Thank you for catching that.
--
Thanks and Regards,
Prateek
prev parent reply other threads:[~2025-12-08 17:37 UTC|newest]
Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-12-08 9:26 K Prateek Nayak
2025-12-08 9:26 ` [RESEND RFC PATCH v2 01/29] sched/fair: Simplify set_cpu_sd_state_*() with guards K Prateek Nayak
2025-12-08 9:26 ` [RESEND RFC PATCH v2 02/29] sched/fair: Use rq->nohz_tick_stopped in update_nohz_stats() K Prateek Nayak
2025-12-08 9:26 ` [RESEND RFC PATCH v2 03/29] sched/topology: Optimize sd->shared allocation and assignment K Prateek Nayak
2025-12-08 9:26 ` [RESEND RFC PATCH v2 04/29] sched/fair: Simplify the entry condition for update_idle_cpu_scan() K Prateek Nayak
2025-12-08 9:26 ` [RESEND RFC PATCH v2 05/29] sched/fair: Simplity SIS_UTIL handling in select_idle_cpu() K Prateek Nayak
2025-12-08 9:26 ` [RESEND RFC PATCH v2 06/29] cpumask: Introduce for_each_cpu_and_wrap() and bitfield helpers K Prateek Nayak
2025-12-12 21:03 ` Yury Norov
2025-12-08 9:26 ` [RESEND RFC PATCH v2 07/29] sched/fair: Use for_each_cpu_and_wrap() in select_idle_capacity() K Prateek Nayak
2025-12-08 9:26 ` [RESEND RFC PATCH v2 08/29] sched/fair: Use for_each_cpu_and_wrap() in select_idle_cpu() K Prateek Nayak
2025-12-08 9:26 ` [RESEND RFC PATCH v2 09/29] sched/fair: Rotate the CPU resposible for busy load balancing K Prateek Nayak
2025-12-08 9:26 ` [RESEND RFC PATCH v2 10/29] sched/fair: Use xchg() to set sd->nohz_idle state K Prateek Nayak
2025-12-08 9:26 ` [RESEND RFC PATCH v2 11/29] sched/topology: Attach new hierarchy in rq_attach_root() K Prateek Nayak
2025-12-08 9:26 ` [RESEND RFC PATCH v2 12/29] sched/fair: Fixup sd->nohz_idle state during hotplug / cpuset K Prateek Nayak
2025-12-08 9:26 ` [RESEND RFC PATCH v2 13/29] sched/fair: Account idle cpus instead of busy cpus in sd->shared K Prateek Nayak
2025-12-08 9:27 ` [RESEND RFC PATCH v2 14/29] sched/topology: Introduce fallback sd->shared assignment K Prateek Nayak
2025-12-08 9:27 ` [RESEND RFC PATCH v2 15/29] sched/topology: Introduce percpu sd_nohz for nohz state tracking K Prateek Nayak
2025-12-08 9:27 ` [RESEND RFC PATCH v2 16/29] sched/topology: Introduce "nohz_idle_cpus_mask" in sd->shared K Prateek Nayak
2025-12-08 9:27 ` [RESEND RFC PATCH v2 17/29] sched/topology: Introduce "nohz_shared_list" to keep track of sd->shared K Prateek Nayak
2025-12-08 9:27 ` [RESEND RFC PATCH v2 18/29] sched/fair: Reorder the barrier in nohz_balance_enter_idle() K Prateek Nayak
2025-12-08 9:27 ` [RESEND RFC PATCH v2 19/29] sched/fair: Extract the main _nohz_idle_balance() loop into a helper K Prateek Nayak
2025-12-08 9:27 ` [RESEND RFC PATCH v2 20/29] sched/fair: Convert find_new_ilb() to use nohz_shared_list K Prateek Nayak
2025-12-08 9:27 ` [RESEND RFC PATCH v2 21/29] sched/fair: Introduce sched_asym_prefer_idle() for ILB kick K Prateek Nayak
2025-12-08 9:27 ` [RESEND RFC PATCH v2 22/29] sched/fair: Convert sched_balance_nohz_idle() to use nohz_shared_list K Prateek Nayak
2025-12-08 9:27 ` [RESEND RFC PATCH v2 23/29] sched/fair: Remove "nohz.idle_cpus_mask" K Prateek Nayak
2025-12-08 9:27 ` [RESEND RFC PATCH v2 24/29] sched/fair: Optimize global "nohz.nr_cpus" tracking K Prateek Nayak
2025-12-08 9:27 ` [RESEND RFC PATCH v2 25/29] sched/topology: Add basic debug information for "nohz_shared_list" K Prateek Nayak
2025-12-08 9:27 ` [RESEND RFC PATCH v2 26/29] [EXPERIMENTAL] sched/fair: Add push task framework K Prateek Nayak
2025-12-08 9:27 ` [RESEND RFC PATCH v2 27/29] [EXPERIMENTAL] sched/fair: Proactive idle balance using push mechanism K Prateek Nayak
2025-12-08 9:27 ` [RESEND RFC PATCH v2 28/29] [EXPERIMENTAL] sched/fair: Add a local counter to rate limit task push K Prateek Nayak
2025-12-08 12:33 ` Christian Loehle
2025-12-08 17:35 ` K Prateek Nayak
2025-12-08 9:27 ` [RESEND RFC PATCH v2 29/29] [EXPERIMENTAL] sched/fair: Faster alternate for intra-NUMA newidle balance K Prateek Nayak
2025-12-08 14:04 ` [RESEND RFC PATCH v2 00/29] sched/fair: Push-based load balancing Shrikanth Hegde
2025-12-08 17:36 ` K Prateek Nayak [this message]
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