linux-kernel - [RFC PATCH v4 0/4] genirq/cpuhotplug: Adjust managed interrupts according to change of housekeeping cpumask

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Message-ID: <20241201124244.997754-1-costa.shul@redhat.com>
Date: Sun,  1 Dec 2024 14:42:40 +0200
From: Costa Shulyupin <costa.shul@...hat.com>
To: longman@...hat.com,
	ming.lei@...hat.com,
	pauld@...hat.com,
	juri.lelli@...hat.com,
	vschneid@...hat.com,
	Tejun Heo <tj@...nel.org>,
	Johannes Weiner <hannes@...xchg.org>,
	Michal Koutný <mkoutny@...e.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Costa Shulyupin <costa.shul@...hat.com>,
	linux-kernel@...r.kernel.org,
	cgroups@...r.kernel.org
Subject: [RFC PATCH v4 0/4] genirq/cpuhotplug: Adjust managed interrupts according to change of housekeeping cpumask

This series of patches is based on series
isolation: Exclude dynamically isolated CPUs from housekeeping masks:
https://lore.kernel.org/lkml/20240821142312.236970-1-longman@redhat.com/
Its purpose is to exclude dynamically isolated CPUs from some
housekeeping masks so that subsystems that check the housekeeping masks
at run time will not use those isolated CPUs.

However, some of subsystems can use obsolete housekeeping CPU masks.
Therefore, to prevent the use of these isolated CPUs, it is necessary to
explicitly propagate changes of the housekeeping masks to all subsystems
depending on the mask.

Signed-off-by: Costa Shulyupin <costa.shul@...hat.com>

---

v4:
- Use CPU hotplug as recommended by Thomas Gleixner.

v3:
- Address the comments by Thomas Gleixner.

v2:
- Focus in this patch series on managed interrupts only.

Costa Shulyupin (4):
  cgroup/cpuset: Add HK_TYPE_MANAGED_IRQ to HOUSEKEEPING_FLAGS
  genirq/cpuhotplug: Dynamically isolate CPUs from managed interrupts
  cgroup/cpuset: Restart CPUs whose isolated_cpus bits have changed
  DO NOT MERGE: Test CPU isolation from managed interrupts

 MAINTAINERS             |   2 +
 kernel/cgroup/cpuset.c  |  36 +++++++++++
 kernel/irq/cpuhotplug.c |   3 +
 tests/managed_irq.sh    | 135 ++++++++++++++++++++++++++++++++++++++++
 4 files changed, 176 insertions(+)
 create mode 100755 tests/managed_irq.sh

-- 
2.47.0