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

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Message-ID: <20180329160914.GR4082@hirez.programming.kicks-ass.net>
Date:   Thu, 29 Mar 2018 18:09:14 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Dave Hansen <dave.hansen@...ux.intel.com>
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 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.