Subj : [$] The intersection of unstable pages and direct I/O
To   : All
From : LWN.net
Date : Thu Nov 13 2025 06:40:08

Longtime LWN readers will have encountered the concept of "stable pages"
before; it was first covered here nearly
15˙years 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.

https://lwn.net/Articles/1045006/
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