On Fri, Apr 21, 2017 at 5:05 AM, Michal Hocko <mho...@kernel.org> wrote:
> Hi,
> The last version of this series has been posted here [1]. It has seen
> some more testing (thanks to Reza Arbab and Igor Mammedov[2]), Jerome's
> and Vlastimil's review resulted in few fixes mostly folded in their
> respected patches.
> There are 4 more patches (patch 6+ in this series). I have checked the
> most prominent pfn walkers to skip over offline holes and now and I feel
> more comfortable to have this merged. All the reported issues should be
> fixed
>
> There is still a lot of work on top - namely this implementation doesn't
> support reonlining to a different zone on the zones boundaries but I
> will do that in a separate series because this one is getting quite
> large already and it should work reasonably well now.
>
> Joonsoo had some worries about pfn_valid and suggested to change its
> semantic to return false on offline holes but I would be rally worried
> to change a established semantic used by a lot of code and so I have
> introuduced pfn_to_online_page helper instead. If this is seen as a
> controversial point I would rather drop pfn_to_online_page and related
> patches as they are not stictly necessary because the code would be
> similarly broken as now wrt. offline holes.
>
> This is a rebase on top of linux-next (next-20170418) and the full
> series is in git://git.kernel.org/pub/scm/linux/kernel/git/mhocko/mm.git
> try attempts/rewrite-mem_hotplug branch.
>
[..]
> Any thoughts, complains, suggestions?
>
> As a bonus we will get a nice cleanup in the memory hotplug codebase.
> arch/ia64/mm/init.c | 11 +-
> arch/powerpc/mm/mem.c | 12 +-
> arch/s390/mm/init.c | 32 +--
> arch/sh/mm/init.c | 10 +-
> arch/x86/mm/init_32.c | 7 +-
> arch/x86/mm/init_64.c | 11 +-
> drivers/base/memory.c | 79 +++----
> drivers/base/node.c | 58 ++----
> include/linux/memory_hotplug.h | 40 +++-
> include/linux/mmzone.h | 44 +++-
> include/linux/node.h | 35 +++-
> kernel/memremap.c | 6 +-
> mm/compaction.c | 5 +-
> mm/memory_hotplug.c | 455
> ++++++++++++++---------------------------
> mm/page_alloc.c | 13 +-
> mm/page_isolation.c | 26 ++-
> mm/sparse.c | 48 ++++-
> 17 files changed, 407 insertions(+), 485 deletions(-)
>
> Shortlog says:
> Michal Hocko (13):
> mm: remove return value from init_currently_empty_zone
> mm, memory_hotplug: use node instead of zone in can_online_high_movable
> mm: drop page_initialized check from get_nid_for_pfn
> mm, memory_hotplug: get rid of is_zone_device_section
> mm, memory_hotplug: split up register_one_node
> mm, memory_hotplug: consider offline memblocks removable
> mm: consider zone which is not fully populated to have holes
> mm, compaction: skip over holes in __reset_isolation_suitable
> mm: __first_valid_page skip over offline pages
> mm, memory_hotplug: do not associate hotadded memory to zones until
> online
> mm, memory_hotplug: replace for_device by want_memblock in
> arch_add_memory
> mm, memory_hotplug: fix the section mismatch warning
> mm, memory_hotplug: remove unused cruft after memory hotplug rework
>
> [1] http://lkml.kernel.org/r/20170410110351.12215-1-mho...@kernel.org
> [2] http://lkml.kernel.org/r/20170410162749.7d7f3...@nial.brq.redhat.com
>
>
The latest "attempts/rewrite-mem_hotplug" branch passes my regression
testing if I cherry-pick the following x86/mm fixes from mainline:
e6ab9c4d4377 x86/mm/64: Fix crash in remove_pagetable()
71389703839e mm, zone_device: Replace {get, put}_zone_device_page()
with a single reference to fix pmem crash
You can add:
Tested-by: Dan Williams <dan.j.willi...@intel.com>
