Re: [PATCH] mm: gup: fix the fast GUP race against THP collapse

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To: David Hildenbrand <david@xxxxxxxxxx>
Subject: Re: [PATCH] mm: gup: fix the fast GUP race against THP collapse
From: Jason Gunthorpe <jgg@xxxxxxxxxx>
Date: Tue, 6 Sep 2022 12:33:21 -0300
Cc: John Hubbard <jhubbard@xxxxxxxxxx>, Yang Shi <shy828301@xxxxxxxxx>, peterx@xxxxxxxxxx, kirill.shutemov@xxxxxxxxxxxxxxx, hughd@xxxxxxxxxx, akpm@xxxxxxxxxxxxxxxxxxxx, linux-mm@xxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx
In-reply-to: <40486dbb-9f19-6fa6-d46d-99d2b033883d@redhat.com>
References: <20220901222707.477402-1-shy828301@gmail.com> <e6ad1084-c301-9f11-1fa7-7614bf859aaf@nvidia.com> <a969abc5-1ad0-4073-a1f9-82f0431a0104@redhat.com> <YxdPi2E63aO0Dgyd@nvidia.com> <4516a349-49cb-fd7b-176a-f1a9479906d9@redhat.com> <YxdZlCly2ad1rtcI@nvidia.com> <40486dbb-9f19-6fa6-d46d-99d2b033883d@redhat.com>

On Tue, Sep 06, 2022 at 04:44:20PM +0200, David Hildenbrand wrote:

> ... I do wonder if we want to reuse ptep_get_lockless() instead of the
> READ_ONCE(). CONFIG_GUP_GET_PTE_LOW_HIGH is confusing.

Yes, that is a whole other topic, and you may be quite right on that.

Jason

References:
- [PATCH] mm: gup: fix the fast GUP race against THP collapse
  - From: Yang Shi
- Re: [PATCH] mm: gup: fix the fast GUP race against THP collapse
  - From: John Hubbard
- Re: [PATCH] mm: gup: fix the fast GUP race against THP collapse
  - From: David Hildenbrand
- Re: [PATCH] mm: gup: fix the fast GUP race against THP collapse
  - From: Jason Gunthorpe
- Re: [PATCH] mm: gup: fix the fast GUP race against THP collapse
  - From: David Hildenbrand
- Re: [PATCH] mm: gup: fix the fast GUP race against THP collapse
  - From: Jason Gunthorpe
- Re: [PATCH] mm: gup: fix the fast GUP race against THP collapse
  - From: David Hildenbrand

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