Re: [LSF/MM/BPF TOPIC] Optimizing Page Cache Readahead Behavior

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To: Lorenzo Stoakes <lorenzo.stoakes@xxxxxxxxxx>
Subject: Re: [LSF/MM/BPF TOPIC] Optimizing Page Cache Readahead Behavior
From: Matthew Wilcox <willy@xxxxxxxxxxxxx>
Date: Sun, 23 Feb 2025 12:24:49 +0000
Cc: Kalesh Singh <kaleshsingh@xxxxxxxxxx>, Kent Overstreet <kent.overstreet@xxxxxxxxx>, lsf-pc@xxxxxxxxxxxxxxxxxxxxxxxxxx, "open list:MEMORY MANAGEMENT" <linux-mm@xxxxxxxxx>, linux-fsdevel <linux-fsdevel@xxxxxxxxxxxxxxx>, Suren Baghdasaryan <surenb@xxxxxxxxxx>, David Hildenbrand <david@xxxxxxxxxx>, "Liam R. Howlett" <Liam.Howlett@xxxxxxxxxx>, Juan Yescas <jyescas@xxxxxxxxxx>, android-mm <android-mm@xxxxxxxxxx>, Vlastimil Babka <vbabka@xxxxxxx>, Michal Hocko <mhocko@xxxxxxxx>, Johannes Weiner <hannes@xxxxxxxxxxx>, Nhat Pham <nphamcs@xxxxxxxxx>
In-reply-to: <31e946de-b8d5-4681-b2ac-006360895a87@lucifer.local>
References: <CAC_TJvfG8GcwG_2w1o6GOTZS8tfEx2h9A91qsenYfYsX8Te=Bg@mail.gmail.com> <dsvx2hyrdnv7smcrgpicqirwsmq5mcmbl7dbwmrx7dobrnxpbh@nxdhmkszdzyk> <CAC_TJvepQjR03qa-9C+kL4Or4COUFjZevv+-0gTUFYgNdquq-Q@mail.gmail.com> <31e946de-b8d5-4681-b2ac-006360895a87@lucifer.local>

On Sun, Feb 23, 2025 at 09:30:57AM +0000, Lorenzo Stoakes wrote:
> It seems strange to me sparse regions would place duplicate zeroed pages in
> the page cache...

https://lore.kernel.org/linux-mm/Z7p-SLdiyQCknetc@xxxxxxxxxxxxxxxxxxxx/

References:
- [LSF/MM/BPF TOPIC] Optimizing Page Cache Readahead Behavior
  - From: Kalesh Singh
- Re: [LSF/MM/BPF TOPIC] Optimizing Page Cache Readahead Behavior
  - From: Kent Overstreet
- Re: [LSF/MM/BPF TOPIC] Optimizing Page Cache Readahead Behavior
  - From: Kalesh Singh
- Re: [LSF/MM/BPF TOPIC] Optimizing Page Cache Readahead Behavior
  - From: Lorenzo Stoakes

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