Re: [PATCH] mm, sparse: fix typo in online_mem_sections

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



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 <mhocko@xxxxxxxx>
>>>>
>>>> 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.

--
To unsubscribe, send a message with 'unsubscribe linux-mm' in
the body to majordomo@xxxxxxxxx.  For more info on Linux MM,
see: http://www.linux-mm.org/ .
Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>



[Index of Archives]     [Linux ARM Kernel]     [Linux ARM]     [Linux Omap]     [Fedora ARM]     [IETF Annouce]     [Bugtraq]     [Linux OMAP]     [Linux MIPS]     [eCos]     [Asterisk Internet PBX]     [Linux API]
  Powered by Linux