Subj : [$] Nested bottom-half locking for realtime kernels
To   : All
From : LWN.net
Date : Mon Jun 17 2024 15:30:05

[$] Nested bottom-half locking for realtime kernels

Date:
Mon, 17 Jun 2024 14:27:11 +0000

Description:
Software-interrupt handlers (also called "bottom halves") have a long
history in the Linux kernel; for much of that history, developers have
wished that they could go away.  One of their unfortunate characteristics
is that they can add unexpected latency to the execution of unrelated
processes; this problem is felt especially acutely in the
realtime-preemption community.  The solution adopted there has created
problems of its own, though; in response Sebastian Andrzej Siewior is 
proposing a new locking mechanism for realtime builds of the kernel that may 
have
benefits for non-realtime users as well.

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Link to news story:
https://lwn.net/Articles/978189/


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