Messages in this thread | | | From | Frederic Weisbecker <> | Subject | [RFC PATCH 0/6] cpuset: Allow to modify isolcpus through cpuset | Date | Wed, 14 Jul 2021 15:54:14 +0200 |
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The fact that "isolcpus=" behaviour can't be modified at runtime is an eternal source of discussion and debate opposing a useful feature against a terrible interface.
I've long since tried to figure out a proper way to control this at runtime using cpusets, which isn't easy as a boot time single cpumask is difficult to map to a hierarchy of cpusets that can even overlap.
The idea here is to map the boot-set isolation behaviour to any cpuset directory whose cpumask is a subset of "isolcpus=". I let you browse for details on the last patch.
Note this is still WIP and half-baked, but I figured it's important to validate the interface early.
git://git.kernel.org/pub/scm/linux/kernel/git/frederic/linux-dynticks.git cpuset/isolation
HEAD: 6d3dba1115b7ea464febf3763244c783e87c7baf
Thanks, Frederic ---
Frederic Weisbecker (6): pci: Decouple HK_FLAG_WQ and HK_FLAG_DOMAIN cpumask fetch workqueue: Decouple HK_FLAG_WQ and HK_FLAG_DOMAIN cpumask fetch net: Decouple HK_FLAG_WQ and HK_FLAG_DOMAIN cpumask fetch sched/isolation: Split domain housekeeping mask from the rest sched/isolation: Make HK_FLAG_DOMAIN mutable cpuset: Add cpuset.isolation_mask file
drivers/pci/pci-driver.c | 21 ++++++-- include/linux/sched/isolation.h | 4 ++ kernel/cgroup/cpuset.c | 111 ++++++++++++++++++++++++++++++++++++++-- kernel/sched/isolation.c | 73 ++++++++++++++++++++++---- kernel/workqueue.c | 4 +- net/core/net-sysfs.c | 6 +-- 6 files changed, 196 insertions(+), 23 deletions(-)
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