On Fri, Oct 20, 2023 at 02:01:13PM +0000, pjy@xxxxxxxxxx wrote:
>
> Please backport commit 786dee864804 ("mm/memory_hotplug: ratelimit page
> migration warnings") to 5.10 stable branch.
>
> Commit message:
> """
> When offlining memory the system can attempt to migrate a lot of pages, if
> there are problems with migration this can flood the logs. Printing all
> the data hogs the CPU and cause some RT threads to run for a long time,
> which may have some bad consequences.
>
> Rate limit the page migration warnings in order to avoid this.
> """
>
> We are sometimes seeing RCU stalls while offlining memory with the 5.10
> kernel due to the printing of these messages.
>
> Applying this patch solves the problem by ratelimiting the prints.
Now queued up, thanks.
greg k-h
