Re: [PATCH v2 1/4] mm/mremap: Optimize the start addresses in move_page_tables()

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To: Joel Fernandes <joel@xxxxxxxxxxxxxxxxx>
Subject: Re: [PATCH v2 1/4] mm/mremap: Optimize the start addresses in move_page_tables()
From: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Date: Fri, 19 May 2023 21:01:07 -0700
Cc: linux-kernel@xxxxxxxxxxxxxxx, linux-kselftest@xxxxxxxxxxxxxxx, linux-mm@xxxxxxxxx, Shuah Khan <shuah@xxxxxxxxxx>, Vlastimil Babka <vbabka@xxxxxxx>, Michal Hocko <mhocko@xxxxxxxx>, Lorenzo Stoakes <lstoakes@xxxxxxxxx>, Kirill A Shutemov <kirill@xxxxxxxxxxxxx>, "Liam R. Howlett" <liam.howlett@xxxxxxxxxx>, "Paul E. McKenney" <paulmck@xxxxxxxxxx>, Suren Baghdasaryan <surenb@xxxxxxxxxx>
In-reply-to: <CAEXW_YTqjGG4Y06brQthe4UMqprTJm=xk=P7i5gTpm2rZRZkXQ@mail.gmail.com>
References: <20230519190934.339332-1-joel@joelfernandes.org> <20230519190934.339332-2-joel@joelfernandes.org> <CAHk-=whoajP4bZMbZC_VYmBhmhCpXsBesszwWUH0i6SpK_dAtw@mail.gmail.com> <CAEXW_YQ4wdGVa5M6jZfi5d-pdJOp1Nu7qTBvWYS=255AnYWZCw@mail.gmail.com> <CAHk-=wj9j+puqhe+E-AcG5j-5nP_tQ7DmAcb=Cb6v7n4mpxXjQ@mail.gmail.com> <CAEXW_YT1qr9F1QaABthUx6qxWPYYom-oW7XMVExzrHLWdhUGKg@mail.gmail.com> <CAEXW_YTqjGG4Y06brQthe4UMqprTJm=xk=P7i5gTpm2rZRZkXQ@mail.gmail.com>

On Fri, May 19, 2023 at 8:57 PM Joel Fernandes <joel@xxxxxxxxxxxxxxxxx> wrote:
>
> I also realize that I don't really need to check whether the masked
> source address falls under a VMA neighboring to that of the source's.

I don't think that's true.

You can't start randomly moving other source vma's that may have other contents.

               Linus

Follow-Ups:
- Re: [PATCH v2 1/4] mm/mremap: Optimize the start addresses in move_page_tables()
  - From: Joel Fernandes
- Re: [PATCH v2 1/4] mm/mremap: Optimize the start addresses in move_page_tables()
  - From: Joel Fernandes

References:
- [PATCH v2 0/4] Optimize mremap during mutual alignment within PMD
  - From: Joel Fernandes (Google)
- [PATCH v2 1/4] mm/mremap: Optimize the start addresses in move_page_tables()
  - From: Joel Fernandes (Google)
- Re: [PATCH v2 1/4] mm/mremap: Optimize the start addresses in move_page_tables()
  - From: Linus Torvalds
- Re: [PATCH v2 1/4] mm/mremap: Optimize the start addresses in move_page_tables()
  - From: Joel Fernandes
- Re: [PATCH v2 1/4] mm/mremap: Optimize the start addresses in move_page_tables()
  - From: Linus Torvalds
- Re: [PATCH v2 1/4] mm/mremap: Optimize the start addresses in move_page_tables()
  - From: Joel Fernandes
- Re: [PATCH v2 1/4] mm/mremap: Optimize the start addresses in move_page_tables()
  - From: Joel Fernandes

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