On 09/05/2017 01:07 PM, Michal Hocko wrote: > On Tue 05-09-17 09:28:36, Michal Hocko wrote: >> On Tue 05-09-17 12:32:28, Anshuman Khandual wrote: >>> On 09/04/2017 04:52 PM, Michal Hocko wrote: >>>> From: Michal Hocko <mho...@suse.com> >>>> >>>> online_mem_sections accidentally marks online only the first section in >>>> the given range. This is a typo which hasn't been noticed because I >>>> haven't tested large 2GB blocks previously. All users of >>> >>> Section sizes are normally less than 2GB. Could you please elaborate >>> why this never got noticed before ? >> >> Section size is 128MB which is the default block size as well. So we >> have one section per block. But if the amount of memory is very large >> (64GB - see probe_memory_block_size) then we have a 2GB memory blocks >> so multiple sections per block. > > And just to clarify. Not that 64G would be too large but the original > patch has been merged in 4.13 so nobody probably managed to hit that > _yet_.
Got it. Section size is 16MB and block size is 256MB on most of the POWER platforms. Hence this could have affected them as well.
