Hacker News new | ask | show | jobs
by nijave 53 days ago
Right on the heels of 6.19 breaking tcmalloc and Mongo
1 comments
matharmin 53 days ago
Yup - interesting to see so much written about Postgres having a performance regression on Linux 7.0, in a scenario that affects almost no-one in practice. Meanwhile MongoDB refuses to run at all on Linux 7.0 due to some issue with tcmalloc.

https://jira.mongodb.org/browse/SERVER-121885

link
duskwuff 53 days ago
The underlying tcmalloc issue is interesting - the library was relying on an implementation detail of the rseq kernel API which was never guaranteed, and which already generated warnings in previous versions.

https://lore.kernel.org/all/20260126204745.GP171111@noisy.pr...

link
nijave 53 days ago
Implemented behavior of the interface vs documented behavior of the interface

I thought the warnings were only generated when you turned on a kernel config "that no one uses in practice"

link