Re: [RFC PATCH v1] blk-mq: isolate CPUs from hctx

[Michal Koutný]

Hello.

On Fri, Nov 08, 2024 at 07:48:30AM GMT, Costa Shulyupin <costa.shul@xxxxxxxxxx> wrote:
> Cgroups allow configuring isolated_cpus at runtime.
> However, blk-mq may still use managed interrupts on the
> newly isolated CPUs.
> 
> Rebuild hctx->cpumask considering isolated CPUs to avoid
> managed interrupts on those CPUs and reclaim non-isolated ones.
> 
> The patch is based on
> isolation: Exclude dynamically isolated CPUs from housekeeping masks:
> https://lore.kernel.org/lkml/20240821142312.236970-1-longman@xxxxxxxxxx/

Even based on that this seems incomplete to me the CPUs that are part of
isolcpus mask on boot time won't be excluded from this?
IOW, isolating CPUs from blk_mq_hw_ctx would only be possible via cpuset
but not "statically" throught the cmdline option, or would it?

Thanks,
Michal

(-Cc: lizefan.x@xxxxxxxxxxxxx)

Attachment: signature.asc
Description: PGP signature