[$] Faster RCUs and lockless memory allocation

Puranjay Mohan shared some of the

[
work](https://lwn.net/ml/all/20260417231203.785172-1-puranjay@kernel.org/) he's been doing recently on improving the
performance of read-copy-update (RCU) at the 2026
[

Linux Storage, Filesystem, Memory-Management, and BPF Summit](https://events.linuxfoundation.org/lsfmmbpf/); his talk would have been nice context to have earlier in the day when Harry Yoo and Alexei Starovoitov led a session about the

[
new kmalloc_nolock() function](https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=af92793e52c3) that

allows for lockless allocation from any kernel context, and which interacts with the RCU subsystem to allow that. This article therefore covers the two sessions together and in the reverse order, to provide that missing context.