On 2023-06-23 11:58:05 [+0200], To Michal Hocko wrote: > But first I'm going to use > hotplug-mem to see how it works. I boot qemu with "-m 4G,slots=4,maxmem=16G". | ~# free -h | total used free shared buff/cache available | Mem: 3,8Gi 221Mi 3,6Gi 520Ki 80Mi 3,6Gi | Swap: 0B 0B 0B Telling qemu to add memory: | object_add memory-backend-ram,id=mem1,size=4G | device_add pc-dimm,id=dimm1,memdev=mem1 I see in Linux: | ~# free -h | total used free shared buff/cache available | Mem: 7,8Gi 345Mi 7,5Gi 516Ki 80Mi 7,5Gi | Swap: 0B 0B 0B memory arrived. Nothing in dmesg and my printk in __build_all_zonelists() did not trigger either. Same after I removed memory with: | device_del dimm1 | object_del mem1 it is gone: | ~# free -h | total used free shared buff/cache available | Mem: 3,8Gi 232Mi 3,6Gi 516Ki 80Mi 3,6Gi | Swap: 0B 0B 0B nothing in dmesg. What did I do wrong not to enter __build_all_zonelists()? Sebastian
