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AlmaLinux forms engineering steering committee

The AlmaLinux project has announced the formation of the AlmaLinux Engineering Steering Committee (ALESCo):

[It] is dedicated to guiding the technical direction of the AlmaLinux distribution on a day-to-day basis within the guidelines set forth by the board, ensuring its robustness, reliability, sustainability, and relevance in the open-source ecosystem. ALESCo will work collaboratively with, and oversee relevant technical-focused Special Interest Groups (SIGs) to achieve these goals. It is "air traffic control" for engineering matters.

The initial members of ALESCo appointed by the AlmaLinux OS Foundation board are Andrew Lukoshko, Ben Thomas, Cody Robertson, Elkhan Mammadli, Jonathan Wright, and Neal Gompa. The AlmaLinux Wiki has more information on the committee's activities and how to get involved.

[$] Dynamically sizing the kernel stack

The kernel stack is a scarce and tightly constrained resource; kernel developers often have to go far out of their way to avoid using too much stack space. The size of the stack is also fixed, leading to situations where it is too small for some code paths, while wastefully large for others. At the 2024 Linux Storage, Filesystem, Memory Management, and BPF Summit, Pasha Tatashin proposed making the kernel stack size dynamic, making more space available when needed while saving memory overall. This change is not as easy to implement as it might seem, though.

[$] Facing down mapcount madness

The page structure is a complicated beast, but some parts of it are more intimidating than others. The mapcount field is one of the scarier parts. It allegedly records the number of references to the page in page tables, but, as David Hildenbrand described during the memory-management track at the 2024 Linux Storage, Filesystem, Memory Management, and BPF Summit, things are more complicated than that. Few people truly understand the semantics of this field, but the situation will hopefully get better over time.

Security updates for Tuesday

Security updates have been issued by AlmaLinux (firefox, nodejs, and thunderbird), Fedora (uriparser), Oracle (firefox and thunderbird), Slackware (mariadb), SUSE (cairo, gdk-pixbuf, krb5, libosinfo, postgresql14, and python310), and Ubuntu (firefox, linux-aws, linux-aws-5.15, and linux-azure).
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