Re: [PATCH 1/1] mm/khugepaged: skip copying lazyfree pages on collapse

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To: Lance Yang <ioworker0@xxxxxxxxx>, Michal Hocko <mhocko@xxxxxxxx>
Subject: Re: [PATCH 1/1] mm/khugepaged: skip copying lazyfree pages on collapse
From: David Hildenbrand <david@xxxxxxxxxx>
Date: Fri, 2 Feb 2024 16:26:47 +0100
Cc: akpm@xxxxxxxxxxxxxxxxxxxx, zokeefe@xxxxxxxxxx, songmuchun@xxxxxxxxxxxxx, shy828301@xxxxxxxxx, peterx@xxxxxxxxxx, minchan@xxxxxxxxxx, linux-mm@xxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx
In-reply-to: <CAK1f24nHmvqm1XD_UkWUB7DmNdH0NEOKzpLgKDJ=UuPWO=rEHw@mail.gmail.com>
Organization: Red Hat
References: <20240201125226.28372-1-ioworker0@gmail.com> <Zby-sHLDlmTRaUcd@tiehlicka> <CAK1f24=7sy_Bczpt5YeDbkhfriYUc1=zreSFdGCxfF3R0D6sRQ@mail.gmail.com> <ZbzfxNn4AYnTVFLh@tiehlicka> <CAK1f24mvBkc2c=fHL6UxMhL2mgLHVrSwZfE5516bOR0yVdfZpQ@mail.gmail.com> <ZbzmvwyTGeW18nJy@tiehlicka> <CAK1f24kdyOnUjcpnrk6j4cF6bSFXQwwzFk9tM+jD4RsO_Hc4hA@mail.gmail.com> <Zbz_ao0uBKabzKB1@tiehlicka> <CAK1f24nHmvqm1XD_UkWUB7DmNdH0NEOKzpLgKDJ=UuPWO=rEHw@mail.gmail.com>
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On 02.02.24 15:52, Lance Yang wrote:

How about blocking khugepaged from
collapsing lazyfree pages? This way,
is it not better to keep the semantics
of MADV_FREE?

What do you think?

Why do we even want to change any behavior here? A lot of things "mightcause confusion among users". Even worse, a lot of things do causeconfusion ;)


--
Cheers,

David / dhildenb

References:
- [PATCH 1/1] mm/khugepaged: skip copying lazyfree pages on collapse
  - From: Lance Yang
- Re: [PATCH 1/1] mm/khugepaged: skip copying lazyfree pages on collapse
  - From: Michal Hocko
- Re: [PATCH 1/1] mm/khugepaged: skip copying lazyfree pages on collapse
  - From: Lance Yang
- Re: [PATCH 1/1] mm/khugepaged: skip copying lazyfree pages on collapse
  - From: Michal Hocko
- Re: [PATCH 1/1] mm/khugepaged: skip copying lazyfree pages on collapse
  - From: Lance Yang
- Re: [PATCH 1/1] mm/khugepaged: skip copying lazyfree pages on collapse
  - From: Michal Hocko
- Re: [PATCH 1/1] mm/khugepaged: skip copying lazyfree pages on collapse
  - From: Lance Yang
- Re: [PATCH 1/1] mm/khugepaged: skip copying lazyfree pages on collapse
  - From: Michal Hocko
- Re: [PATCH 1/1] mm/khugepaged: skip copying lazyfree pages on collapse
  - From: Lance Yang

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