Re: [PATCH v9 12/12] mm: stop zeroing memory during allocation in vmemmap
From: Michal Hocko <mhocko@kernel.org>
Date: 2017-10-04 08:45:32
Also in:
linux-arm-kernel, linux-mm, lkml, sparclinux
On Tue 03-10-17 16:26:51, Pasha Tatashin wrote:
Hi Michal, I decided not to merge these two patches, because in addition to sparc optimization move, we have this dependancies:
optimizations can and should go on top of the core patch.
mm: zero reserved and unavailable struct pages must be before mm: stop zeroing memory during allocation in vmemmap. Otherwise, we can end-up with struct pages that are not zeroed properly.
Right and you can deal with it easily. Just introduce the mm_zero_struct_page earlier along with its user in "stop zeroing ..." I think that moving the zeroying in one go is more reasonable than adding it to __init_single_page with misleading numbers and later dropping the zeroying from the memmap path. -- Michal Hocko SUSE Labs