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Date: Wed, 31 May 2017 12:10:24 +1000
From: Balbir Singh <bsingharora@gmail.com>
To: =?UTF-8?B?SsOpcsO0bWU=?= Glisse <jglisse@redhat.com>
Cc: akpm@linux-foundation.org, linux-kernel@vger.kernel.org,
        linux-mm@kvack.org, Dan Williams <dan.j.williams@intel.com>,
        "Kirill A . Shutemov" <kirill.shutemov@linux.intel.com>,
        John Hubbard <jhubbard@nvidia.com>,
        Evgeny Baskakov <ebaskakov@nvidia.com>,
        Mark Hairgrove <mhairgrove@nvidia.com>,
        Sherry Cheung <SCheung@nvidia.com>, Subhash Gutti <sgutti@nvidia.com>
Subject: Re: [HMM 02/15] mm/hmm: heterogeneous memory management (HMM for
 short) v4
Message-ID: <20170531121024.4e14f91a@firefly.ozlabs.ibm.com>
In-Reply-To: <20170524172024.30810-3-jglisse@redhat.com>
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        <20170524172024.30810-3-jglisse@redhat.com>
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On Wed, 24 May 2017 13:20:11 -0400
Jérôme Glisse <jglisse@redhat.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@redhat.com>
> Signed-off-by: Evgeny Baskakov <ebaskakov@nvidia.com>
> Signed-off-by: John Hubbard <jhubbard@nvidia.com>
> Signed-off-by: Mark Hairgrove <mhairgrove@nvidia.com>
> Signed-off-by: Sherry Cheung <SCheung@nvidia.com>
> Signed-off-by: Subhash Gutti <sgutti@nvidia.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.