[$] The intersection of unstable pages and direct I/O

Date:
Wed, 12 Nov 2025 15:51:04 +0000

Description:
Longtime LWN readers will have encountered the concept of "stable pages" before; it was first covered here nearly
15years ago. For the most part, the problem that stable pages were
meant to solve preventing errors when user space modifies a buffer that
is under I/O has been dealt with. But
recent discussions show that there is one area where problems remain:
direct I/O . There is some disagreement,
though, over whether those problems are the result of user-space bugs and
how much of a performance price should be paid to address them.

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Link to news story:
https://lwn.net/Articles/1045006/


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