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Date: Thu, 17 Aug 2017 14:39:16 -0700
From: Andrew Morton <akpm@linux-foundation.org>
Subject: Re: [HMM-v25 00/19] HMM (Heterogeneous Memory Management) v25
Message-Id: <20170817143916.63fca76e4c1fd841e0afd4cf@linux-foundation.org>
In-Reply-To: <20170817000548.32038-1-jglisse@redhat.com>
References: <20170817000548.32038-1-jglisse@redhat.com>
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To: =?ISO-8859-1?Q?J=E9r=F4me?= Glisse <jglisse@redhat.com>
Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org, John Hubbard <jhubbard@nvidia.com>, Dan Williams <dan.j.williams@intel.com>, David Nellans <dnellans@nvidia.com>, Balbir Singh <bsingharora@gmail.com>

On Wed, 16 Aug 2017 20:05:29 -0400 J__r__me Glisse <jglisse@redhat.com> wrote:

> Heterogeneous Memory Management (HMM) (description and justification)

The patchset adds 55 kbytes to x86_64's mm/*.o and there doesn't appear
to be any way of avoiding this overhead, or of avoiding whatever
runtime overheads are added.

It also adds 18k to arm's mm/*.o and arm doesn't support HMM at all.

So that's all quite a lot of bloat for systems which get no benefit from
the patchset.  What can we do to improve this situation (a lot)?

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