On Tue 30-01-18 14:00:06, Bharata B Rao wrote: > Hi, > > With the latest upstream, I see that memory hotplug is not working > as expected. The hotplugged memory isn't seen to increase the total > RAM pages. This has been observed with both x86 and Power guests. > > 1. Memory hotplug code intially marks pages as PageReserved via > __add_section(). > 2. Later the struct page gets cleared in __init_single_page(). > 3. Next online_pages_range() increments totalram_pages only when > PageReserved is set.
You are right. I have completely forgot about this late struct page initialization during onlining. memory hotplug really doesn't want zeroying. Let me think about a fix. -- Michal Hocko SUSE Labs
