linux-kernel - Re: [PATCH v3] x86,sched: allow topologies where NUMA nodes share an LLC

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Message-ID: <224bbc83-125d-0507-92af-5b6b4af62834@linux.intel.com>
Date:   Thu, 29 Mar 2018 09:25:21 -0700
From:   Dave Hansen <dave.hansen@...ux.intel.com>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Alison Schofield <alison.schofield@...el.com>,
        Ingo Molnar <mingo@...nel.org>,
        Tony Luck <tony.luck@...el.com>,
        Tim Chen <tim.c.chen@...ux.intel.com>,
        "H. Peter Anvin" <hpa@...ux.intel.com>,
        Borislav Petkov <bp@...en8.de>,
        David Rientjes <rientjes@...gle.com>,
        Igor Mammedov <imammedo@...hat.com>,
        Prarit Bhargava <prarit@...hat.com>, brice.goglin@...il.com,
        x86@...nel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3] x86,sched: allow topologies where NUMA nodes share an
 LLC

On 03/29/2018 09:09 AM, Peter Zijlstra wrote:
> On Thu, Mar 29, 2018 at 07:34:58AM -0700, Dave Hansen wrote:
>> What should we say, though?
>>
>>              /*
>> 	      * false means 'c' does not share the LLC of 'o'.
>> 	      * Note: this decision gets reflected all the way
>> 	      * out to userspace
>> 	      */
>>              return false;
> That works, I suppose. You might want to put in a refernce to wherever
> it is you shrink llc-size such that cache-per-cpu remains invariant.

Hmm, if we shrink llc-size by splitting it, do we also need to create a
unique "id" for each slice?