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

[Michal Hocko]

On Tue 03-10-17 11:22:35, Pasha Tatashin wrote:
> 
> 
> 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.

THen this is just misleading.
-- 
Michal Hocko
SUSE Labs