linux-kernel - RE: [PATCH] x86, sched: allow topolgies where NUMA nodes share an LLC

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Message-ID: <3908561D78D1C84285E8C5FCA982C28F612CC19A@ORSMSX114.amr.corp.intel.com>
Date:   Thu, 8 Jun 2017 20:08:31 +0000
From:   "Luck, Tony" <tony.luck@...el.com>
To:     Peter Zijlstra <peterz@...radead.org>,
        Dave Hansen <dave.hansen@...ux.intel.com>
CC:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "tim.c.chen@...ux.intel.com" <tim.c.chen@...ux.intel.com>,
        "bp@...en8.de" <bp@...en8.de>,
        "rientjes@...gle.com" <rientjes@...gle.com>,
        "imammedo@...hat.com" <imammedo@...hat.com>,
        "torvalds@...ux-foundation.org" <torvalds@...ux-foundation.org>,
        "prarit@...hat.com" <prarit@...hat.com>,
        "toshi.kani@...com" <toshi.kani@...com>,
        "brice.goglin@...il.com" <brice.goglin@...il.com>,
        "hpa@...ux.intel.com" <hpa@...ux.intel.com>,
        "mingo@...nel.org" <mingo@...nel.org>
Subject: RE: [PATCH] x86, sched: allow topolgies where NUMA nodes share an
 LLC

> What does? That does sound broken. How can a cache domain sanely span
> memory controllers?

Think "cluster on die" with cores on the socket split into two clusters, but still sharing LLC.

-Tony