KAMEZAWA Hiroyuki wrote:
quoted text
> For example, mem_notify() in online_pages() will be called several times against
> a section.
>   

It seems the only in-tree user of the notifier is mm/slub.c, and it only 
cares about MEM_GOING_ONLINE, GOING_OFFLINE, OFFLINE and CANCEL_ONLINE 
(not ONLINE or CANCEL_OFFLINE).

Also,

	if (onlined_pages)
		memory_notify(MEM_ONLINE, &arg);

doesn't seem correct, because arg.nr_pages still has the original 
nr_pages, and not the number of pages actually onlined (onlined_pages).  
Also arg.start_pfn isn't terribly meaningful if a discontiguous set of 
pages can be actually onlined.

    J
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