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

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To: Lance Yang <ioworker0@xxxxxxxxx>
Subject: Re: [PATCH 1/1] mm/khugepaged: skip copying lazyfree pages on collapse
From: Michal Hocko <mhocko@xxxxxxxx>
Date: Fri, 2 Feb 2024 16:38:48 +0100
Cc: akpm@xxxxxxxxxxxxxxxxxxxx, zokeefe@xxxxxxxxxx, david@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>
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>

On Fri 02-02-24 22:52:49, Lance Yang wrote:
> How about blocking khugepaged from
> collapsing lazyfree pages? This way,
> is it not better to keep the semantics
> of MADV_FREE?

I do not see any reason why. And you are not providing any
actual reasoning either. Unless you have a very specific
example in mind I do not think we want to change the current
behavior.
-- 
Michal Hocko
SUSE Labs

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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