On Tue, Dec 23 2025, Pasha Tatashin wrote: > On Sat, Dec 6, 2025 at 6:03 PM Pratyush Yadav <[email protected]> wrote: >> >> Hugetlb live update support does not yet work with CMA. Print a warning >> and disable CMA if the config for live updating hugetlb is enabled, and >> liveupdate is enabled at runtime. > > Could you please elaborate this commit to explain why it is not > supported, and what it would take to support CMA.
The main reason is that when HugeTLB CMA is enabled, the huge pages come from CMA. If we have preserved pages, we would need to "insert" those pages into the CMA when they are restored. CMA does support multiple ranges, so I suppose it can be done, but it needs some plumbing to work properly. Will add this in the next revision. -- Regards, Pratyush Yadav
