Subj : [$] Restartable sequences, TCMalloc, and Hyrum's Law
To   : All
From : LWN.net
Date : Fri May 01 2026 06:40:09

Hyrum's Law states that any
observable behavior of a system will eventually be depended upon by
somebody.  The kernel community is currently contending with a clear
demonstration of that principle.  The recent work to address some restartable-sequences
performance problems in the 6.19 release maintained the documented API
in all respects, but that was not enough; Google's TCMalloc
library, as it turns out, violates the documented API, prevents other code
from using restartable features, and breaks with 6.19.  But the kernel's
no-regressions rule is forcing developers to find a way to accommodate
TCMalloc's behavior.

https://lwn.net/Articles/1070072/
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