Re: [Bug 220599] New: KSM performance degradation after Linux 6.16 update

Re: [Bug 220599] New: KSM performance degradation after Linux 6.16 update

[Andrew Morton]

(switched to email.  Please respond via emailed reply-to-all, not via the
bugzilla web interface).

On Wed, 24 Sep 2025 09:36:44 +0000 bugzilla-daemon@kernel.org wrote:

> https://bugzilla.kernel.org/show_bug.cgi?id=220599

There are more details at the above link.

>             Bug ID: 220599
>            Summary: KSM performance degradation after Linux 6.16 update
>            Product: Memory Management
>            Version: 2.5
>           Hardware: All
>                 OS: Linux
>             Status: NEW
>           Severity: normal
>           Priority: P3
>          Component: Other
>           Assignee: akpm@linux-foundation.org
>           Reporter: craftfever@tutamail.com
>         Regression: No
> 
> After updating to Linux 6.16, I'm expecting freezing, particularly with
> Chromium applications, when usind KSM with MemoryKSM setting. ksmd kernel
> thread spikes to 100% cpu usage, with console and chromium apps freeze, which
> not the case with linux<=6.15.x. I believe this happens, 'cause chromium-based
> apps using V8 sandbox with huge virtual memory size, but, again, it's alright
> on linux 6.15 or earlier. With Linux 6.16 it's a nightmare.

Thanks.

Please prefer to report issues via email - we don't use the bugzilla
thing and I rather wish it didn't exist.