linux-kernel - Re: [HMM 02/15] mm/hmm: heterogeneous memory management (HMM for short) v4

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Message-ID: <20170531121024.4e14f91a@firefly.ozlabs.ibm.com>
Date:   Wed, 31 May 2017 12:10:24 +1000
From:   Balbir Singh <bsingharora@...il.com>
To:     Jérôme Glisse <jglisse@...hat.com>
Cc:     akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org, Dan Williams <dan.j.williams@...el.com>,
        "Kirill A . Shutemov" <kirill.shutemov@...ux.intel.com>,
        John Hubbard <jhubbard@...dia.com>,
        Evgeny Baskakov <ebaskakov@...dia.com>,
        Mark Hairgrove <mhairgrove@...dia.com>,
        Sherry Cheung <SCheung@...dia.com>,
        Subhash Gutti <sgutti@...dia.com>
Subject: Re: [HMM 02/15] mm/hmm: heterogeneous memory management (HMM for
 short) v4

On Wed, 24 May 2017 13:20:11 -0400
Jérôme Glisse <jglisse@...hat.com> wrote:

> HMM provides 3 separate types of functionality:
>     - Mirroring: synchronize CPU page table and device page table
>     - Device memory: allocating struct page for device memory
>     - Migration: migrating regular memory to device memory
> 
> This patch introduces some common helpers and definitions to all of
> those 3 functionality.
> 
> Changed since v3:
>   - Unconditionaly build hmm.c for static keys
> Changed since v2:
>   - s/device unaddressable/device private
> Changed since v1:
>   - Kconfig logic (depend on x86-64 and use ARCH_HAS pattern)
> 
> Signed-off-by: Jérôme Glisse <jglisse@...hat.com>
> Signed-off-by: Evgeny Baskakov <ebaskakov@...dia.com>
> Signed-off-by: John Hubbard <jhubbard@...dia.com>
> Signed-off-by: Mark Hairgrove <mhairgrove@...dia.com>
> Signed-off-by: Sherry Cheung <SCheung@...dia.com>
> Signed-off-by: Subhash Gutti <sgutti@...dia.com>
> ---

It would be nice to explain a bit of how hmm_pfn_t bits work with pfn
and find out what we need from an arch to support HMM.


Balbir Singh.