Cliff note: HMM offers 2 things (each standing on its own). First
it allows to use device memory transparently inside any process
without any modifications to process program code. Second it allows
to mirror process address space on a device.
Change since v13 are small, it was about including everyone remarks
into the patchset (splitting each features into its own kernel config,
adding better comment, splitting optimization from base implementation,
improved comments, ...).
Patchset is divided into 3 features that can each be use independently
from one another. First is changes to ZONE_DEVICE so we can have struct
page for device un-addressable memory (patch 2-6). Second is process
address space mirroring (patch 8 to 10), this allow to snapshot CPU
page table and to keep the device page table synchronize with the CPU
one.
Last is a new page migration helper which allow migration for range of
virtual address using hardware copy engine (patch 11-14).
Other patches just introduce common definitions or add safety net to
catch wrong use of some of the features.
Andrew do you want anyone specific to review any specific part of the
patchset before considering it for inclusion ? At this point i want
to know if there is ever a chance of getting this upstream or do we
decide that we don't want to support this kind of hardware ?
In this patchset i restricted myself to set of core features what
is missing:
- force read only on CPU for memory duplication and GPU atomic
- changes to mmu_notifier for optimization purposes
- migration of file back page to device memory
I plan to submit a couple more patchset to implement those features
once core HMM is upstream.
Previous patchset posting :
v1 http://lwn.net/Articles/597289/
v2 https://lkml.org/lkml/2014/6/12/559
v3 https://lkml.org/lkml/2014/6/13/633
v4 https://lkml.org/lkml/2014/8/29/423
v5 https://lkml.org/lkml/2014/11/3/759
v6 http://lwn.net/Articles/619737/
v7 http://lwn.net/Articles/627316/
v8 https://lwn.net/Articles/645515/
v9 https://lwn.net/Articles/651553/
v10 https://lwn.net/Articles/654430/
v11 http://www.gossamer-threads.com/lists/linux/kernel/2286424
v12 http://www.kernelhub.org/?msg=972982&p=2
v13 https://lwn.net/Articles/706856/
Cheers,
Jérôme
Jérôme Glisse (16):
mm/free_hot_cold_page: catch ZONE_DEVICE pages
mm/memory/hotplug: convert device bool to int to allow for more flags
v2
mm/ZONE_DEVICE/devmem_pages_remove: allow early removal of device
memory
mm/ZONE_DEVICE/free-page: callback when page is freed
mm/ZONE_DEVICE/unaddressable: add support for un-addressable device
memory
mm/ZONE_DEVICE/x86: add support for un-addressable device memory
mm/hmm: heterogeneous memory management (HMM for short)
mm/hmm/mirror: mirror process address space on device with HMM helpers
mm/hmm/mirror: helper to snapshot CPU page table
mm/hmm/mirror: device page fault handler
mm/hmm/migrate: support un-addressable ZONE_DEVICE page in migration
mm/hmm/migrate: add new boolean copy flag to migratepage() callback
mm/hmm/migrate: new memory migration helper for use with device memory
v2
mm/hmm/migrate: optimize page map once in vma being migrated
mm/hmm/devmem: device driver helper to hotplug ZONE_DEVICE memory
mm/hmm/devmem: dummy HMM device as an helper for ZONE_DEVICE memory
MAINTAINERS | 7 +
arch/ia64/mm/init.c | 23 +-
arch/powerpc/mm/mem.c | 22 +-
arch/s390/mm/init.c | 10 +-
arch/sh/mm/init.c | 22 +-
arch/tile/mm/init.c | 10 +-
arch/x86/mm/init_32.c | 23 +-
arch/x86/mm/init_64.c | 41 +-
drivers/dax/pmem.c | 3 +-
drivers/nvdimm/pmem.c | 7 +-
drivers/staging/lustre/lustre/llite/rw26.c | 8 +-
fs/aio.c | 7 +-
fs/btrfs/disk-io.c | 11 +-
fs/hugetlbfs/inode.c | 9 +-
fs/nfs/internal.h | 5 +-
fs/nfs/write.c | 9 +-
fs/proc/task_mmu.c | 10 +-
fs/ubifs/file.c | 8 +-
include/linux/balloon_compaction.h | 3 +-
include/linux/fs.h | 13 +-
include/linux/hmm.h | 525 ++++++++++++++
include/linux/memory_hotplug.h | 31 +-
include/linux/memremap.h | 60 +-
include/linux/migrate.h | 7 +-
include/linux/mm_types.h | 5 +
include/linux/swap.h | 18 +-
include/linux/swapops.h | 67 ++
kernel/fork.c | 2 +
kernel/memremap.c | 69 +-
mm/Kconfig | 51 ++
mm/Makefile | 1 +
mm/balloon_compaction.c | 2 +-
mm/hmm.c | 1082 ++++++++++++++++++++++++++++
mm/memory.c | 62 ++
mm/memory_hotplug.c | 4 +-
mm/migrate.c | 687 +++++++++++++++++-
mm/mprotect.c | 12 +
mm/page_alloc.c | 10 +
mm/rmap.c | 47 ++
mm/zsmalloc.c | 12 +-
tools/testing/nvdimm/test/iomap.c | 3 +-
41 files changed, 2924 insertions(+), 84 deletions(-)
create mode 100644 include/linux/hmm.h
create mode 100644 mm/hmm.c
--
2.4.3
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