I'm wondering, ain't simple enabling of config
DEFERRED_STRUCT_PAGE_INIT provide even better speed-up? If that is the
case then it seems like this series is not needed at all, right?
I am not sure why is this config optional. It looks like it could be
enabled by default or even unconditionally considering that with
commit c9e97a1997fb ("mm: initialize pages on demand during boot") the
deferred code is statically disabled after all the pages are
initialized.

Hi Daniel,

Currently, deferred struct pages are initialized in parallel only on NUMA machines. I would like to make a change to use all the available CPUs even on a single socket systems, but that is not there yet. So, I believe Jia's performance improvements are still relevant.

Thank you,
Pavel