Messages in this thread | | | Date | Mon, 20 Apr 2020 18:02:46 +0200 | From | Frederic Weisbecker <> | Subject | Re: [patch 0/4] affine kernel threads to nohz_full= cpumask (v4) |
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On Wed, Apr 01, 2020 at 09:10:18AM -0300, Marcelo Tosatti wrote: > This is a kernel enhancement that configures the cpu affinity of kernel > threads via kernel boot option nohz_full=. > > When this option is specified, the cpumask is immediately applied upon > thread launch. This does not affect kernel threads that specify cpu > and node. > > This allows CPU isolation (that is not allowing certain threads > to execute on certain CPUs) without using the isolcpus=domain parameter, > making it possible to enable load balancing on such CPUs > during runtime (see kernel-parameters.txt). > > Note-1: this is based off on Wind River's patch at > https://github.com/starlingx-staging/stx-integ/blob/master/kernel/kernel-std/centos/patches/affine-compute-kernel-threads.patch > > Difference being that this patch is limited to modifying > kernel thread cpumask: Behaviour of other threads can > be controlled via cgroups or sched_setaffinity. > > Note-2: Wind River's patch was based off Christoph Lameter's patch at > https://lwn.net/Articles/565932/ with the only difference being > the kernel parameter changed from kthread to kthread_cpus. > > v2: use isolcpus= subcommand (Thomas Gleixner) > > v3: s/MontaVista/Wind River/ on changelog (Chris Friesen) > documentation updates (Chris Friesen) > undeprecate isolcpus (Chris Friesen) > general cleanups (Frederic Weisbecker) > separate cpu_possible_mask kthread > mask change (Frederic Weisbecker) > > v4: disable idle load balancing for nohz_full= > use nohz_full= option for kthread isolation (Frederic Weisbecker) >
Thanks for the patches. I'm applying them, I may add a few details to the changelogs and stuff.
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