Re: [PATCH 0/2][RFC] Makes sd->flags sysctl writable

[Valentin Schneider]

On 06/07/20 21:00, Peter Zijlstra wrote:
> On Tue, Jul 07, 2020 at 03:36:13AM +0800, Chen Yu wrote:
>> It was found that recently the flags of sched domain could
>> not be customized via sysctl, which might make it a little
>> inconenient for performance tuning/debugging.
>
> What specific goals do you have? This is a debug interface.

Also, while the update_top_cache_domain() call on sysctl write may work,
you're back to square one as soon as you go through a hotplug cycle, which
is icky.

That said, I second Peter in that I'm curious as to what you're really
using this interface for. Manually hacking the default / arch topology
flags is a bit tedious, but it's doable.