From: Qiliang Yuan <realwujing@gmail.com>
To: peterz@infradead.org
Cc: longman@redhat.com, cgroups@vger.kernel.org,
akpm@linux-foundation.org, anna-maria@linutronix.de,
boqun.feng@gmail.com, bsegall@google.com,
dietmar.eggemann@arm.com, frederic@kernel.org,
hannes@cmpxchg.org, jackmanb@google.com, jiangshanlai@gmail.com,
joelagnelf@nvidia.com, josh@joshtriplett.org,
juri.lelli@redhat.com, linux-kernel@vger.kernel.org,
linux-kselftest@vger.kernel.org, linux-mm@kvack.org,
mathieu.desnoyers@efficios.com, mgorman@suse.de, mhocko@suse.com,
mingo@kernel.org, mingo@redhat.com, neeraj.upadhyay@kernel.org,
paulmck@kernel.org, qiang.zhang@linux.dev, rcu@vger.kernel.org,
realwujing@gmail.com, rostedt@goodmis.org, shuah@kernel.org,
surenb@google.com, tglx@kernel.org, tj@kernel.org,
urezki@gmail.com, vbabka@suse.cz, vincent.guittot@linaro.org,
vschneid@redhat.com, ziy@nvidia.com
Subject: Re: [PATCH 13/15] sched/isolation: Implement sysfs interface for dynamic housekeeping
Date: Mon, 30 Mar 2026 19:46:20 +0800 [thread overview]
Message-ID: <20260330114620.104027-1-realwujing@gmail.com> (raw)
In-Reply-To: <20260325140432.GE3738786@noisy.programming.kicks-ass.net>
On Wed, Mar 25, 2026 at 03:04:32PM +0100, Peter Zijlstra wrote:
> Why? What was wrong with cpusets?
This is the central point of the architecture. The distinction I was
trying to address is:
1. Task Isolation (Current CPUSets):
The `cpuset` subsystem (especially `cpuset.cpus.partition = isolated`)
is excellent at managing task placement and load balancing. It
ensures no user tasks are pushed to isolated CPUs.
2. Kernel Overhead Isolation (Housekeeping):
Currently, `cpusets` do not manage kernel-internal overhead like RCU
callbacks, timers, or unbound workqueues. These are managed by the
global `housekeeping_cpumask`, which is settled at boot via
`isolcpus`/`nohz_full` and is static.
DHEI fills this second gap by making the housekeeping mask dynamic.
However, I agree that a parallel sysfs interface is redundant.
In V13, I will move the control interface to `cpuset`. The root cpuset
will serve as the primary interface, allowing changes in the cpuset
partition state to automatically trigger the migration of kernel
housekeeping overhead. This achieves "Full Dynamic Isolation" (both tasks
and kernel overhead) through a single, unified interface.
Best regards,
Qiliang
next prev parent reply other threads:[~2026-03-30 11:46 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-03-25 9:09 [PATCH 00/15] Implementation of Dynamic Housekeeping & Enhanced Isolation (DHEI) Qiliang Yuan
2026-03-25 9:09 ` [PATCH 01/15] sched/isolation: Support dynamic allocation for housekeeping masks Qiliang Yuan
2026-03-25 13:57 ` Peter Zijlstra
2026-03-30 11:43 ` Qiliang Yuan
2026-03-25 9:09 ` [PATCH 02/15] sched/isolation: Introduce housekeeping notifier infrastructure Qiliang Yuan
2026-03-25 13:58 ` Peter Zijlstra
2026-03-30 11:44 ` Qiliang Yuan
2026-03-25 9:09 ` [PATCH 03/15] sched/isolation: Separate housekeeping types in enum hk_type Qiliang Yuan
2026-03-25 13:59 ` Peter Zijlstra
2026-03-30 11:44 ` Qiliang Yuan
2026-03-25 9:09 ` [PATCH 04/15] genirq: Support dynamic migration for managed interrupts Qiliang Yuan
2026-03-25 9:09 ` [PATCH 05/15] rcu: Support runtime NOCB initialization and dynamic offloading Qiliang Yuan
2026-03-25 9:09 ` [PATCH 06/15] sched/core: Dynamically update scheduler domain housekeeping mask Qiliang Yuan
2026-03-25 14:00 ` Peter Zijlstra
2026-03-30 11:45 ` Qiliang Yuan
2026-03-25 9:09 ` [PATCH 07/15] watchdog: Allow runtime toggle of lockup detector affinity Qiliang Yuan
2026-03-25 14:03 ` Peter Zijlstra
2026-03-30 11:45 ` Qiliang Yuan
2026-03-25 9:09 ` [PATCH 08/15] workqueue: Support dynamic housekeeping mask updates Qiliang Yuan
2026-03-25 9:09 ` [PATCH 09/15] mm/compaction: Support dynamic housekeeping mask updates for kcompactd Qiliang Yuan
2026-03-25 9:09 ` [PATCH 10/15] tick/nohz: Transition to dynamic full dynticks state management Qiliang Yuan
2026-03-25 9:09 ` [PATCH 11/15] sched/isolation: Implement SMT-aware isolation and safety guards Qiliang Yuan
2026-03-25 9:09 ` [PATCH 12/15] sched/isolation: Bridge boot-time parameters with dynamic isolation Qiliang Yuan
2026-03-25 9:09 ` [PATCH 13/15] sched/isolation: Implement sysfs interface for dynamic housekeeping Qiliang Yuan
2026-03-25 14:04 ` Peter Zijlstra
2026-03-30 11:46 ` Qiliang Yuan [this message]
2026-03-25 9:09 ` [PATCH 14/15] Documentation: isolation: Document DHEI sysfs interfaces Qiliang Yuan
2026-03-25 9:09 ` [PATCH 15/15] selftests: dhei: Add functional tests for dynamic housekeeping Qiliang Yuan
2026-03-25 16:02 ` [PATCH 00/15] Implementation of Dynamic Housekeeping & Enhanced Isolation (DHEI) Tejun Heo
2026-03-30 11:41 ` Qiliang Yuan
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