Re: [PATCH v3 4/5] powerpc/smp: Add support detecting thread-groups sharing L2 cache

From: Srikar Dronamraju
Date: Tue Dec 15 2020 - 03:45:05 EST


* Gautham R. Shenoy <ego@xxxxxxxxxxxxxxxxxx> [2020-12-10 16:08:58]:

> From: "Gautham R. Shenoy" <ego@xxxxxxxxxxxxxxxxxx>
>
> On POWER systems, groups of threads within a core sharing the L2-cache
> can be indicated by the "ibm,thread-groups" property array with the
> identifier "2".
>
> This patch adds support for detecting this, and when present, populate
> the populating the cpu_l2_cache_mask of every CPU to the core-siblings
> which share L2 with the CPU as specified in the by the
> "ibm,thread-groups" property array.
>
> On a platform with the following "ibm,thread-group" configuration
> 00000001 00000002 00000004 00000000
> 00000002 00000004 00000006 00000001
> 00000003 00000005 00000007 00000002
> 00000002 00000004 00000000 00000002
> 00000004 00000006 00000001 00000003
> 00000005 00000007
>

Looks good to me.

Reviewed-by: Srikar Dronamraju <srikar@xxxxxxxxxxxxxxxxxx>

--
Thanks and Regards
Srikar Dronamraju