linux-kernel - Re: [HMM-v25 00/19] HMM (Heterogeneous Memory Management) v25

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Message-Id: <20170817143916.63fca76e4c1fd841e0afd4cf@linux-foundation.org>
Date:   Thu, 17 Aug 2017 14:39:16 -0700
From:   Andrew Morton <akpm@...ux-foundation.org>
To:     Jérôme Glisse <jglisse@...hat.com>
Cc:     linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        John Hubbard <jhubbard@...dia.com>,
        Dan Williams <dan.j.williams@...el.com>,
        David Nellans <dnellans@...dia.com>,
        Balbir Singh <bsingharora@...il.com>
Subject: Re: [HMM-v25 00/19] HMM (Heterogeneous Memory Management) v25

On Wed, 16 Aug 2017 20:05:29 -0400 J__r__me Glisse <jglisse@...hat.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)?