[PATCH v9 06/12] mm: zero struct pages during initialization

[Pasha Tatashin]

On 10/03/2017 09:08 AM, Michal Hocko wrote:
> On Wed 20-09-17 16:17:08, Pavel Tatashin wrote:
>> Add struct page zeroing as a part of initialization of other fields in
>> __init_single_page().
>>
>> This single thread performance collected on: Intel(R) Xeon(R) CPU E7-8895
>> v3 @ 2.60GHz with 1T of memory (268400646 pages in 8 nodes):
>>
>>                          BASE            FIX
>> sparse_init     11.244671836s   0.007199623s
>> zone_sizes_init  4.879775891s   8.355182299s
>>                    --------------------------
>> Total           16.124447727s   8.362381922s
> 
> Hmm, this is confusing. This assumes that sparse_init doesn't zero pages
> anymore, right? So these number depend on the last patch in the series?

Correct, without the last patch sparse_init time won't change.

Pasha