Re: [PATCH v2 2/2] powerpc/smp: Disable steal from updating CPU capacity

* Vincent Guittot [off-list ref] [2025-11-03 09:46:26]:

Hi Sikar,

On Wed, 29 Oct 2025 at 09:32, Srikar Dronamraju [off-list ref] wrote:

quoted

* Vincent Guittot [off-list ref] [2025-10-29 08:43:34]:

quoted

Hi Srikar,

On Wed, 29 Oct 2025 at 07:09, Srikar Dronamraju [off-list ref] wrote:

quoted

In a shared LPAR with SMT enabled, it has been observed that when a CPU
experiences steal time, it can trigger task migrations between sibling
CPUs. The idle CPU pulls a runnable task from its sibling that is
impacted by steal, making the previously busy CPU go idle. This reversal

IIUC, the migration is triggered by the reduced capacity case when
there is 1 task on the CPU

Hi Peter, Vincent

Do you have any more inputs on this?
If not can this pulled into the scheduler code.

--
Thanks and Regards
Srikar Dronamraju