On 2026/5/21 22:09, Michael S. Tsirkin wrote: > On Wed, May 20, 2026 at 06:20:13PM -0400, Michael S. Tsirkin wrote: >> When a guest reports free pages to the hypervisor via virtio-balloon's >> free page reporting, the host typically zeros those pages when reclaiming >> their backing memory (e.g., via MADV_DONTNEED on anonymous mappings). >> When the guest later reallocates those pages, the kernel zeros them >> again, redundantly. > > FYI Sashiko reported a couple of issues. Mostly false positives but > I tweaked commit log to make it clearer. But also a couple of > real issues. So far I have this diff on top: > > ---> > > Changes from v8 to v9 candidate (code only): > > 1. mm/mempolicy.c (patch 1: mm: mempolicy: fix interleave index calculation) > Combine vm_pgoff and VMA offset into a single expression before > shifting, fixing carry loss for file-backed VMAs with unaligned > vm_pgoff. > > 2. mm/memory-failure.c (patch 2: mm: memory-failure: serialize > TestSetPageHWPoison with zone->lock) > Wrap ClearPageHWPoison in retry path with zone->lock too.
It seems TestClearPageHWPoison and SetPageHWPoison are missing. Should we serialize them with zone->lock too? Thanks. .
