Description of problem:
Kernel Same-page Merging (CONFIG_KSM) is a mechanism of reducing duplicated pages in the kernel and can reduce memory usage for some cases. Unfortunately the work required to scan physical pages for duplicate contents can result in latency spikes on a real time Linux kernel.
To warn users of this potential, print a warning when ksmd is activated on a realtime kernel.
Created attachment 1345569 [details]
rt: warn when KSM thread runs on PREEMPT_RT
First cut at patch to warn when ksmd runs on RT
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.
For information on the advisory, and where to find the updated
files, follow the link below.
If the solution does not work for you, open a new bug report.