linux-kernel - Re: [RESEND PATCH 0/3] mm: Add cache coloring mechanism

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Message-ID: <82cc1886-6c24-4e6e-7269-4d150e9f39eb@intel.com>
Date:   Thu, 24 Aug 2017 09:08:32 -0700
From:   Dave Hansen <dave.hansen@...el.com>
To:     Vlastimil Babka <vbabka@...e.cz>,
        Łukasz Daniluk <lukasz.daniluk@...el.com>,
        linux-mm@...ck.org, linux-kernel@...r.kernel.org
Cc:     lukasz.anaczkowski@...el.com
Subject: Re: [RESEND PATCH 0/3] mm: Add cache coloring mechanism

On 08/24/2017 05:47 AM, Vlastimil Babka wrote:
> So the obvious question, what about THPs? Their size should be enough to
> contain all the colors with current caches, no? Even on KNL I didn't
> find more than "32x 1 MB 16-way L2 caches". This is in addition to the
> improved TLB performance, which you want to get as well for such workloads?

The cache in this case is "MCDRAM" which is 16GB in size.  It can be
used as normal RAM or a cache.  This patch deals with when "MCDRAM" is
in its cache mode.

It's described in the "Memory Modes" slide here:

> http://www.nersc.gov/users/computational-systems/cori/configuration/knl-processor-modes/