Hello Jiri, On Thu, Jun 12, 2025 at 12:11:19PM +0200, Jiri Bohac wrote:
> Currently this is only the case for memory ballooning and zswap. Such movable > memory will be missing from the vmcore. User data is typically not dumped by > makedumpfile. For zswap and zsmalloc pages, I'm wondering whether these pages will be missing from the vmcore, or if there's a possibility they might be present but corrupted—especially since they could reside in the CMA region, which may be overwritten by the kdump environment. My main question is: Do we need to explicitly teach makedumpfile to ignore the CMA area in the vmcore, since it is already being overwritten and thus unreliable? Or does makedumpfile already have mechanisms in place to automatically ignore these special zswap/zsmalloc pages that may have been overwritten if they were located in the CMA region?
