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Date: Wed, 17 Apr 2013 07:50:41 +0800
From: Simon Jeons <simon.jeons@gmail.com>
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Subject: Re: [LSF/MM TOPIC] Hardware initiated paging of user process pages,
 hardware access to the CPU page tables of user processes
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To: Jerome Glisse <j.glisse@gmail.com>
Cc: Shachar Raindel <raindel@mellanox.com>, lsf-pc@lists.linux-foundation.org, linux-mm@kvack.org, Andrea Arcangeli <aarcange@redhat.com>, Roland Dreier <roland@purestorage.com>, Haggai Eran <haggaie@mellanox.com>, Or Gerlitz <ogerlitz@mellanox.com>, Sagi Grimberg <sagig@mellanox.com>, Liran Liss <liranl@mellanox.com>

On 04/17/2013 12:27 AM, Jerome Glisse wrote:

[snip]
>
>
> As i said this is for pre-filling already present entry, ie pte that 
> are present with a valid page (no special bit set). This is an 
> optimization so that the GPU can pre-fill its tlb without having to 
> take any mmap_sem. Hope is that in most common case this will be 
> enough, but in some case you will have to go through the lengthy non 
> fast gup.

I know this. What I concern is the pte you mentioned is for normal cpu, 
correct? How can you pre-fill pte and tlb of GPU?

>
> Cheers,
> Jerome

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