driver. I however intend to grow the
functionalities of the hmm dummy driver in order to make a test and
regression suite for the core hmm.
Cheers,
Jérôme Glisse
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More
From: Jérôme Glisse jgli...@redhat.com
New code will need to be able to differentiate between a regular unmap and
an unmap trigger by vmscan in which case we want to be as quick as possible.
Signed-off-by: Jérôme Glisse jgli...@redhat.com
---
include/linux/rmap.h | 15 ---
mm/memory
From: Jérôme Glisse jgli...@redhat.com
Motivation:
Heterogeneous memory management is intended to allow a device to transparently
access a process address space without having to lock pages of the process or
take references on them. In other word mirroring a process address space while
allowing
From: Jérôme Glisse jgli...@redhat.com
This is a dummy driver which full fill two purposes :
- showcase the hmm api and gives references on how to use it.
- provide an extensive user space api to stress test hmm.
This is a particularly dangerous module as it allow to access a
mirror
From: Jérôme Glisse jgli...@redhat.com
New user of the mmu_notifier interface need to lookup vma in order to
perform the invalidation operation. Instead of redoing a vma lookup
inside the callback just pass through the vma from the call site where
it is already available.
This needs small
From: Jérôme Glisse jgli...@redhat.com
The action information will be usefull for new user of mmu_notifier API.
The action argument differentiate between a vma disappearing, a page
being write protected or simply a page being unmaped. This allow new
user to take different action for instance
but i intend to send a v4 next week. So i
really would like to see those included for next release.
As usual comments welcome.
Cheers,
Jérôme Glisse
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More majordomo info
From: Jérôme Glisse jgli...@redhat.com
New user of the mmu_notifier interface need to lookup vma in order to
perform the invalidation operation. Instead of redoing a vma lookup
inside the callback just pass through the vma from the call site where
it is already available.
This needs small
From: Jérôme Glisse jgli...@redhat.com
The event information will be usefull for new user of mmu_notifier API.
The event argument differentiate between a vma disappearing, a page
being write protected or simply a page being unmaped. This allow new
user to take different path for different event
From: Jérôme Glisse jgli...@redhat.com
New code will need to be able to differentiate between a regular unmap and
an unmap trigger by vmscan in which case we want to be as quick as possible.
Signed-off-by: Jérôme Glisse jgli...@redhat.com
---
include/linux/rmap.h | 15 ---
mm/memory
From: Jérôme Glisse jgli...@redhat.com
Several subsystem require a callback when a mm struct is being destroy
so that they can cleanup there respective per mm struct. Instead of
having each subsystem add its callback to mmput use a notifier chain
to call each of the subsystem.
This will allow
Minor fixes since last post (1), apply on top of 4.2-rc6 done
that because conflict in infiniband are harder to solve then
conflict with mm tree.
Tree with the patchset:
git://people.freedesktop.org/~glisse/linux hmm-v10 branch
Previous cover letter :
HMM (Heterogeneous Memory Management) is
This add the core HMM callback for mlx5 device driver and initialize
the HMM device for the mlx5 infiniband device driver.
Changed since v1:
- Adapt to new hmm_mirror lifetime rules.
- HMM_ISDIRTY no longer exist.
Changed since v2:
- Adapt to HMM page table changes.
Signed-off-by: Jérôme
When migrating memory the same array for HMM page table entry might be
use with several different devices. Add a new select flag so current
device driver callback can know which entry are selected for the device.
Signed-off-by: Jérôme Glisse jgli...@redhat.com
---
include/linux/hmm_pt.h | 6
When faulting or updating the device page table properly handle the case of
device memory entry.
Signed-off-by: Jérôme Glisse jgli...@redhat.com
---
mm/hmm.c | 13 +
1 file changed, 13 insertions(+)
diff --git a/mm/hmm.c b/mm/hmm.c
index 08c0160..8b1003a 100644
--- a/mm/hmm.c
+++ b
migrating.
- Fix reverse logic on mm_forbids_zeropage()
- Add comment on why we add to lru list new page.
Signed-off-by: Jérôme Glisse jgli...@redhat.com
---
include/linux/mm.h | 14 ++
mm/memory.c| 471 +
2 files changed, 485 insertions
-off-by: Jérôme Glisse jgli...@redhat.com
Signed-off-by: Sherry Cheung sche...@nvidia.com
Signed-off-by: Subhash Gutti sgu...@nvidia.com
Signed-off-by: Mark Hairgrove mhairgr...@nvidia.com
Signed-off-by: John Hubbard jhubb...@nvidia.com
Signed-off-by: Jatin Kumar jaku...@nvidia.com
---
include/linux
This add documentation with a high level overview of how HMM works
and a more in depth view of how it should be use by device driver
writers.
Signed-off-by: Jérôme Glisse jgli...@redhat.com
---
Documentation/vm/hmm.txt | 219 +++
1 file changed, 219
file. Hence
it should not be enabled by default and only people actively
developing for hmm should use it.
Signed-off-by: Jérôme Glisse jgli...@redhat.com
---
drivers/char/Kconfig | 9 +
drivers/char/Makefile | 1 +
drivers/char/hmm_dummy.c | 923
Device driver must properly toggle the dirty inside the mirror page table
so dirtyness is properly accounted when core mm code needs to know. Provide
a simple helper to toggle that bit for a range of address.
Changed since v1:
- Adapt to HMM page table changes.
Signed-off-by: Jérôme Glisse
map accross call which fit well with the HMM mirror page
table update code.
Signed-off-by: Jérôme Glisse jgli...@redhat.com
---
mm/hmm.c | 95
1 file changed, 95 insertions(+)
diff --git a/mm/hmm.c b/mm/hmm.c
index 88f7801..f0c3c81
table changes.
Signed-off-by: Jérôme Glisse jgli...@redhat.com
---
include/linux/hmm_pt.h | 11 +++
mm/hmm.c | 200 +++--
2 files changed, 173 insertions(+), 38 deletions(-)
diff --git a/include/linux/hmm_pt.h b/include/linux/hmm_pt.h
index
THE HARDWARE WILL NO LONGER
ACCESS THE RANGE BECAUSE CALLING THIS HELPER !
Signed-off-by: Jérôme Glisse jgli...@redhat.com
---
include/linux/hmm.h | 3 +++
mm/hmm.c| 24
2 files changed, 27 insertions(+)
diff --git a/include/linux/hmm.h b/include/linux/hmm.h
index
page table. To avoid complex reverse
dma mapping lookup just pass along a pointer to the page being
invalidated.
Changed since v1:
- English syntax fixes.
Signed-off-by: Jérôme Glisse jgli...@redhat.com
---
drivers/infiniband/core/umem_odp.c | 1 +
drivers/iommu/amd_iommu_v2.c | 1
.
- Export mirror ref/unref functions.
- English syntax fixes.
Changed since v4:
- Properly reference existing hmm struct if any.
Signed-off-by: Jérôme Glisse jgli...@redhat.com
Signed-off-by: Sherry Cheung sche...@nvidia.com
Signed-off-by: Subhash Gutti sgu...@nvidia.com
Signed-off-by: Mark Hairgrove
Several use case for getting pointer to spinlock protecting a directory.
Signed-off-by: Jérôme Glisse jgli...@redhat.com
---
include/linux/hmm_pt.h | 25 +
1 file changed, 25 insertions(+)
diff --git a/include/linux/hmm_pt.h b/include/linux/hmm_pt.h
index f745d6c
When CPU try to access memory that have been migrated to device memory
we have to copy it back to system memory. This patch implement the CPU
page fault handler for special HMM pte swap entry.
Signed-off-by: Jérôme Glisse jgli...@redhat.com
---
mm/hmm.c | 54
change along the way.
Signed-off-by: Jérôme Glisse jgli...@redhat.com
---
include/linux/mm.h | 12 +++
mm/memory.c| 257 +
2 files changed, 269 insertions(+)
diff --git a/include/linux/mm.h b/include/linux/mm.h
index 580fe65
This patch add fake device memory by simply using regular system memory
page and pretending they are not accessible by the CPU directly. This
serve to showcase how migration to device memory can be impemented inside
a real device driver.
Signed-off-by: Jérôme Glisse jgli...@redhat.com
page table changes.
- Fix bug in migration failure code path.
Signed-off-by: Jérôme Glisse jgli...@redhat.com
Signed-off-by: Sherry Cheung sche...@nvidia.com
Signed-off-by: Subhash Gutti sgu...@nvidia.com
Signed-off-by: Mark Hairgrove mhairgr...@nvidia.com
Signed-off-by: John Hubbard jhubb
When forking if process being fork had any memory migrated to some
device memory, we need to make a system copy for the child process.
Latter patches can revisit this and use the same COW semantic for
device memory.
Signed-off-by: Jérôme Glisse jgli...@redhat.com
---
mm/hmm.c | 38
in hmm_mirror_fault()
Changed since v3:
- Adapt to HMM page table changes.
Signed-off-by: Jérôme Glisse jgli...@redhat.com
Signed-off-by: Sherry Cheung sche...@nvidia.com
Signed-off-by: Subhash Gutti sgu...@nvidia.com
Signed-off-by: Mark Hairgrove mhairgr...@nvidia.com
Signed-off-by: John Hubbard jhubb
() - hmm_pt_iter_populate().
- Add hmm_pt_iter_walk()
- Remove hmm_pt_iter_next() (useless now).
- Code simplification and improved comments.
- Fix hmm_pt_fini_directory().
Changed since v3:
- Fix hmm_pt_iter_directory_unref_safe().
Signed-off-by: Jérôme Glisse jgli...@redhat.com
Signed-off
Minor fixes since last post (1), apply on top of rc6 done
that because conflict in infiniband are harder to solve then
conflict with mm tree.
Tree with the patchset:
git://people.freedesktop.org/~glisse/linux hmm-v10 branch
This part of the patchset implement anonymous memory migration.
It
and hooks HMM helpers
functions inside the page fault and fork code path.
Changed since v1:
- Fix name when of HMM CPU page fault function.
Signed-off-by: Jérôme Glisse jgli...@redhat.com
Signed-off-by: Sherry Cheung sche...@nvidia.com
Signed-off-by: Subhash Gutti sgu...@nvidia.com
Signed-off
with HMM will have to copy migrated page on fork.
We do not expect this to be a common or advised thing to do so we
resort to the simpler solution of allocating new page. If this kind
of usage turns out to be important we will revisit way to achieve
COW even for remote memory.
Signed-off-by: Jérôme
For memory migrated to device we need a new type of memory entry.
Signed-off-by: Jérôme Glisse jgli...@redhat.com
Signed-off-by: Sherry Cheung sche...@nvidia.com
Signed-off-by: Subhash Gutti sgu...@nvidia.com
Signed-off-by: Mark Hairgrove mhairgr...@nvidia.com
Signed-off-by: John Hubbard jhubb
When using HMM for ODP it will be useful to pass the current mirror
page table iterator for __mlx_ib_populated_pas() function benefit. Add
void parameter for this.
Signed-off-by: Jérôme Glisse jgli...@redhat.com
---
drivers/infiniband/hw/mlx5/mem.c | 8 +---
drivers/infiniband/hw/mlx5
:
- Adapt to new hmm_mirror lifetime rules.
- Fix scan of existing mirror in ib_umem_odp_get().
Changed since v2:
- Remove FIXME for empty umem as it is an invalid case.
- Fix HMM version of ib_umem_odp_release()
Signed-off-by: Jérôme Glisse jgli...@redhat.com
Signed-off-by: John Hubbard
are suppose to be use.
- English syntax fixes.
Signed-off-by: Jérôme Glisse jgli...@redhat.com
Reviewed-by: Rik van Riel r...@redhat.com
Reviewed-by: Haggai Eran hagg...@mellanox.com
---
drivers/gpu/drm/amd/amdgpu/amdgpu_mn.c | 13 ++--
drivers/gpu/drm/i915/i915_gem_userptr.c | 10 +--
drivers
To be able to reuse the DMA mapping logic, split it in two functions.
Signed-off-by: Jérôme Glisse jgli...@redhat.com
---
mm/hmm.c | 120 ++-
1 file changed, 65 insertions(+), 55 deletions(-)
diff --git a/mm/hmm.c b/mm/hmm.c
index
for migration, calling mm_hmm_migrate_cleanup()
is wrong.
Signed-off-by: Jérôme Glisse jgli...@redhat.com
Signed-off-by: Sherry Cheung sche...@nvidia.com
Signed-off-by: Subhash Gutti sgu...@nvidia.com
Signed-off-by: Mark Hairgrove mhairgr...@nvidia.com
Signed-off-by: John Hubbard jhubb...@nvidia.com
From: Jerome Glisse jgli...@redhat.com
This patch only adds the new callback device driver must implement
to copy memory from and to device memory.
Changed since v1:
- Pass down the vma to the copy function.
Signed-off-by: Jérôme Glisse jgli...@redhat.com
Signed-off-by: Sherry Cheung sche
This patch allow to invalidate a range while excluding call to a specific
mmu_notifier which allow for a subsystem to invalidate a range for everyone
but itself.
Signed-off-by: Jérôme Glisse jgli...@redhat.com
---
include/linux/mmu_notifier.h | 66
mm
.
- Differentiate fork from other case.
Changed since v7:
- Renamed MMU_HUGE_PAGE_SPLIT to MMU_HUGE_PAGE_SPLIT.
- Renamed MMU_ISDIRTY to MMU_CLEAR_SOFT_DIRTY.
- Renamed MMU_WRITE_PROTECT to MMU_KSM_WRITE_PROTECT.
- English syntax fixes.
Signed-off-by: Jérôme Glisse jgli...@redhat.com
Reviewed
All pieces are in place for ODP (on demand paging) to work using HMM.
Add kernel option and final code to enable it.
Changed since v1:
- Added kernel option in this last patch of the serie.
Signed-off-by: Jérôme Glisse jgli...@redhat.com
---
drivers/infiniband/Kconfig | 10
This is a preparatory patch for HMM implementation of ODP (on demand
paging). It shuffle codes around that will be share between current
ODP implementation and HMM code path. It also convert many #ifdef
CONFIG to #if IS_ENABLED().
Signed-off-by: Jérôme Glisse jgli...@redhat.com
---
drivers
This patch add HMM specific support for hardware page faulting of
user memory region.
Changed since v1:
- Adapt to HMM page table changes.
- Turn some sanity test to BUG_ON().
Signed-off-by: Jérôme Glisse jgli...@redhat.com
---
drivers/infiniband/hw/mlx5/odp.c | 144
by using the page passed
by the mmu_notifier layer.
Signed-off-by: Jérôme Glisse jgli...@redhat.com
---
mm/hmm.c | 53 +++--
1 file changed, 35 insertions(+), 18 deletions(-)
diff --git a/mm/hmm.c b/mm/hmm.c
index f0c3c81..d652233 100644
--- a/mm/hmm.c
When using HMM for ODP it will be useful to pass the current mirror
page table iterator for mlx5_ib_update_mtt() function benefit. Add
void parameter for this.
Signed-off-by: Jérôme Glisse jgli...@redhat.com
---
drivers/infiniband/hw/mlx5/mlx5_ib.h | 2 +-
drivers/infiniband/hw/mlx5/mr.c
Posting just for comment, still waiting on HMM to be accepted before
this patchset can be considered for inclusion.
This patchset implement the on demand paging feature using HMM. It
depends on the HMM patchset v10 (previous post (1)). Long term plan
is to replace ODP with HMM allowing to share
The mlx5 driver will need this function for its driver specific bit
of ODP (on demand paging) on HMM (Heterogeneous Memory Management).
Signed-off-by: Jérôme Glisse jgli...@redhat.com
---
drivers/infiniband/core/umem_rbtree.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/drivers/infiniband
THE HARDWARE WILL NO LONGER
ACCESS THE RANGE BECAUSE CALLING THIS HELPER !
Signed-off-by: Jérôme Glisse jgli...@redhat.com
---
include/linux/hmm.h | 3 +++
mm/hmm.c| 24
2 files changed, 27 insertions(+)
diff --git a/include/linux/hmm.h b/include/linux/hmm.h
index
() - hmm_pt_iter_populate().
- Add hmm_pt_iter_walk()
- Remove hmm_pt_iter_next() (useless now).
- Code simplification and improved comments.
- Fix hmm_pt_fini_directory().
Signed-off-by: Jérôme Glisse jgli...@redhat.com
Signed-off-by: Sherry Cheung sche...@nvidia.com
Signed-off-by: Subhash Gutti
.
- Export mirror ref/unref functions.
- English syntax fixes.
Signed-off-by: Jérôme Glisse jgli...@redhat.com
Signed-off-by: Sherry Cheung sche...@nvidia.com
Signed-off-by: Subhash Gutti sgu...@nvidia.com
Signed-off-by: Mark Hairgrove mhairgr...@nvidia.com
Signed-off-by: John Hubbard jhubb...@nvidia.com
in hmm_mirror_fault()
Changed since v3:
- Adapt to HMM page table changes.
Signed-off-by: Jérôme Glisse jgli...@redhat.com
Signed-off-by: Sherry Cheung sche...@nvidia.com
Signed-off-by: Subhash Gutti sgu...@nvidia.com
Signed-off-by: Mark Hairgrove mhairgr...@nvidia.com
Signed-off-by: John Hubbard jhubb
This add documentation with a high level overview of how HMM works
and a more in depth view of how it should be use by device driver
writers.
Signed-off-by: Jérôme Glisse jgli...@redhat.com
---
Documentation/vm/hmm.txt | 219 +++
1 file changed, 219
Device driver must properly toggle the dirty inside the mirror page table
so dirtyness is properly accounted when core mm code needs to know. Provide
a simple helper to toggle that bit for a range of address.
Changed since v1:
- Adapt to HMM page table changes.
Signed-off-by: Jérôme Glisse
Not much changed since last post (1), i did incorporate comments i got
so far, fixed couple bugs here and there and simplified the HMM page
table code. I am splitting the patchset into 3 parts. The first part
has the core of HMM and is enough for device that do not care about
memory migration. The
map accross call which fit well with the HMM mirror page
table update code.
Signed-off-by: Jérôme Glisse jgli...@redhat.com
---
mm/hmm.c | 95
1 file changed, 95 insertions(+)
diff --git a/mm/hmm.c b/mm/hmm.c
index a9e3dc5..826080b
table changes.
Signed-off-by: Jérôme Glisse jgli...@redhat.com
---
include/linux/hmm_pt.h | 11 +++
mm/hmm.c | 200 +++--
2 files changed, 173 insertions(+), 38 deletions(-)
diff --git a/include/linux/hmm_pt.h b/include/linux/hmm_pt.h
index
file. Hence
it should not be enabled by default and only people actively
developing for hmm should use it.
Signed-off-by: Jérôme Glisse jgli...@redhat.com
---
drivers/char/Kconfig | 9 +
drivers/char/Makefile | 1 +
drivers/char/hmm_dummy.c | 925
-off-by: Jérôme Glisse jgli...@redhat.com
Signed-off-by: Sherry Cheung sche...@nvidia.com
Signed-off-by: Subhash Gutti sgu...@nvidia.com
Signed-off-by: Mark Hairgrove mhairgr...@nvidia.com
Signed-off-by: John Hubbard jhubb...@nvidia.com
Signed-off-by: Jatin Kumar jaku...@nvidia.com
---
include/linux
by using the page passed
by the mmu_notifier layer.
Signed-off-by: Jérôme Glisse jgli...@redhat.com
---
mm/hmm.c | 53 +++--
1 file changed, 35 insertions(+), 18 deletions(-)
diff --git a/mm/hmm.c b/mm/hmm.c
index 826080b..0ecc3b0 100644
--- a/mm/hmm.c
This patch allow to invalidate a range while excluding call to a specific
mmu_notifier which allow for a subsystem to invalidate a range for everyone
but itself.
Signed-off-by: Jérôme Glisse jgli...@redhat.com
---
include/linux/mmu_notifier.h | 66
mm
page table. To avoid complex reverse
dma mapping lookup just pass along a pointer to the page being
invalidated.
Changed since v1:
- English syntax fixes.
Signed-off-by: Jérôme Glisse jgli...@redhat.com
---
drivers/infiniband/core/umem_odp.c | 1 +
drivers/iommu/amd_iommu_v2.c | 1
.
- Differentiate fork from other case.
Changed since v7:
- Renamed MMU_HUGE_PAGE_SPLIT to MMU_HUGE_PAGE_SPLIT.
- Renamed MMU_ISDIRTY to MMU_CLEAR_SOFT_DIRTY.
- Renamed MMU_WRITE_PROTECT to MMU_KSM_WRITE_PROTECT.
- English syntax fixes.
Signed-off-by: Jérôme Glisse jgli...@redhat.com
Reviewed
are suppose to be use.
- English syntax fixes.
Signed-off-by: Jérôme Glisse jgli...@redhat.com
Reviewed-by: Rik van Riel r...@redhat.com
Reviewed-by: Haggai Eran hagg...@mellanox.com
---
drivers/gpu/drm/amd/amdgpu/amdgpu_mn.c | 13 ++--
drivers/gpu/drm/i915/i915_gem_userptr.c | 10 +--
drivers
This patchset implement the on demand paging feature using HMM. It
depends on the HMM patchset v9 (previous post (1)). Long term plan
is to replace ODP with HMM allowing to share same code infrastructure
accross different class of devices.
HMM (Heterogeneous Memory Management) is an helper layer
:
- Adapt to new hmm_mirror lifetime rules.
- Fix scan of existing mirror in ib_umem_odp_get().
Signed-off-by: Jérôme Glisse jgli...@redhat.com
Signed-off-by: John Hubbard jhubb...@nvidia.com
Signed-off-by: Haggai Eran hagg...@mellanox.com
---
drivers/infiniband/core/umem_odp.c| 150
This patch add HMM specific support for hardware page faulting of
user memory region.
Changed since v1:
- Adapt to HMM page table changes.
- Turn some sanity test to BUG_ON().
Signed-off-by: Jérôme Glisse jgli...@redhat.com
---
drivers/infiniband/hw/mlx5/odp.c | 144
This add the core HMM callback for mlx5 device driver and initialize
the HMM device for the mlx5 infiniband device driver.
Changed since v1:
- Adapt to new hmm_mirror lifetime rules.
- HMM_ISDIRTY no longer exist.
Changed since v2:
- Adapt to HMM page table changes.
Signed-off-by: Jérôme
All pieces are in place for ODP (on demand paging) to work using HMM.
Signed-off-by: Jérôme Glisse jgli...@redhat.com
---
drivers/infiniband/core/uverbs_cmd.c | 4
drivers/infiniband/hw/mlx5/main.c| 5 -
2 files changed, 4 insertions(+), 5 deletions(-)
diff --git a/drivers
When using HMM for ODP it will be useful to pass the current mirror
page table iterator for __mlx_ib_populated_pas() function benefit. Add
void parameter for this.
Signed-off-by: Jérôme Glisse jgli...@redhat.com
---
drivers/infiniband/hw/mlx5/mem.c | 8 +---
drivers/infiniband/hw/mlx5
The mlx5 driver will need this function for its driver specific bit
of ODP (on demand paging) on HMM (Heterogeneous Memory Management).
Signed-off-by: Jérôme Glisse jgli...@redhat.com
---
drivers/infiniband/core/umem_rbtree.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/drivers/infiniband
When using HMM for ODP it will be useful to pass the current mirror
page table iterator for mlx5_ib_update_mtt() function benefit. Add
void parameter for this.
Signed-off-by: Jérôme Glisse jgli...@redhat.com
---
drivers/infiniband/hw/mlx5/mlx5_ib.h | 2 +-
drivers/infiniband/hw/mlx5/mr.c
This is a preparatory patch for HMM implementation of ODP (on demand
paging). It introduce a new configure option and add proper build
time conditional code section. Enabling INFINIBAND_ON_DEMAND_PAGING_HMM
will result in build error with this patch.
Signed-off-by: Jérôme Glisse jgli
This patch allow to invalidate a range while excluding call to a specific
mmu_notifier which allow for a subsystem to invalidate a range for everyone
but itself.
Signed-off-by: Jérôme Glisse <jgli...@redhat.com>
---
include/linux/mmu_notifier.
ult()
Changed since v3:
- Adapt to HMM page table changes.
Changed since v4:
- Fix PROT_NONE, ie do not populate from protnone pte.
- Fix huge pmd handling (start address may != pmd start address)
- Fix missing entry case.
Signed-off-by: Jérôme Glisse <jgli...@redhat.com>
Signed-off-by: Sher
ult() -> hmm_pt_iter_populate().
- Add hmm_pt_iter_walk()
- Remove hmm_pt_iter_next() (useless now).
- Code simplification and improved comments.
- Fix hmm_pt_fini_directory().
Changed since v3:
- Fix hmm_pt_iter_directory_unref_safe().
Signed-off-by: Jérôme Glisse <jgli...@redhat.com>
Support hugetlb vma allmost like other vma. Exception being that we
will not support migration of hugetlb memory.
Signed-off-by: Jérôme Glisse <jgli...@redhat.com>
---
mm/hmm.c | 62 +-
1 file changed, 61 insertions(+), 1 de
entry and hooks HMM helpers
functions inside the page fault and fork code path.
Changed since v1:
- Fix name when of HMM CPU page fault function.
Signed-off-by: Jérôme Glisse <jgli...@redhat.com>
Signed-off-by: Sherry Cheung <sche...@nvidia.com>
Signed-off-by: Subhash Gutti <sgu...@n
From: Jerome Glisse <jgli...@redhat.com>
This patch only adds the new callback device driver must implement
to copy memory from and to device memory.
Changed since v1:
- Pass down the vma to the copy function.
Signed-off-by: Jérôme Glisse <jgli...@redhat.com>
Signed-off-by: S
page table. To avoid complex reverse
dma mapping lookup just pass along a pointer to the page being
invalidated.
Changed since v1:
- English syntax fixes.
Signed-off-by: Jérôme Glisse <jgli...@redhat.com>
---
drivers/infiniband/core/umem_odp.c | 1 +
drivers/iommu/amd_iommu_v2.c
.
- Differentiate fork from other case.
Changed since v7:
- Renamed MMU_HUGE_PAGE_SPLIT to MMU_HUGE_PAGE_SPLIT.
- Renamed MMU_ISDIRTY to MMU_CLEAR_SOFT_DIRTY.
- Renamed MMU_WRITE_PROTECT to MMU_KSM_WRITE_PROTECT.
- English syntax fixes.
Signed-off-by: Jérôme Glisse <jgli...@redhat.
Minor fixes since last post (1), apply on top of 4.3rc6.
Please consider applying. Tree with the patchset:
git://people.freedesktop.org/~glisse/linux hmm-v11 branch
HMM (HMM (Heterogeneous Memory Management) is an helper layer
for device driver, its main features are :
- Shadow CPU page table
Minor fixes since last post, apply on top of 4.3rc6. Tree with
the patchset:
git://people.freedesktop.org/~glisse/linux hmm-v11 branch
This patchset implement anonymous memory migration for HMM.
See HMM patchset for full description of what is HMM and why
doing HMM :
When migrating memory the same array for HMM page table entry might be
use with several different devices. Add a new select flag so current
device driver callback can know which entry are selected for the device.
Signed-off-by: Jérôme Glisse <jgli...@redhat.com>
---
include/linux/hmm_pt
To be able to reuse the DMA mapping logic, split it in two functions.
Signed-off-by: Jérôme Glisse <jgli...@redhat.com>
---
mm/hmm.c | 120 ++-
1 file changed, 65 insertions(+), 55 deletions(-)
diff --git a/mm/hmm.c b/mm/hmm.c
When faulting or updating the device page table properly handle the case of
device memory entry.
Signed-off-by: Jérôme Glisse <jgli...@redhat.com>
---
mm/hmm.c | 13 +
1 file changed, 13 insertions(+)
diff --git a/mm/hmm.c b/mm/hmm.c
index 1c81c68..6224131 100644
--- a/mm
When forking if process being fork had any memory migrated to some
device memory, we need to make a system copy for the child process.
Latter patches can revisit this and use the same COW semantic for
device memory.
Signed-off-by: Jérôme Glisse <jgli...@redhat.com>
---
mm/hmm.
When CPU try to access memory that have been migrated to device memory
we have to copy it back to system memory. This patch implement the CPU
page fault handler for special HMM pte swap entry.
Signed-off-by: Jérôme Glisse <jgli...@redhat.com>
---
mm/hmm.
table changes.
Signed-off-by: Jérôme Glisse <jgli...@redhat.com>
---
include/linux/hmm_pt.h | 11 +++
mm/hmm.c | 202 +++--
2 files changed, 174 insertions(+), 39 deletions(-)
diff --git a/include/linux/hmm_pt.h b/include/linux/hm
This add documentation on how HMM works and a more in depth view of how it
should be use by device driver writers.
Signed-off-by: Jérôme Glisse <jgli...@redhat.com>
---
Documentation/vm/hmm.txt | 219 +++
1 file changed, 219 insertions(+)
creat
Device driver must properly toggle the dirty inside the mirror page table
so dirtyness is properly accounted when core mm code needs to know. Provide
a simple helper to toggle that bit for a range of address.
Changed since v1:
- Adapt to HMM page table changes.
Signed-off-by: Jérôme Glisse
map accross call which fit well with the HMM mirror page
table update code.
Signed-off-by: Jérôme Glisse <jgli...@redhat.com>
---
mm/hmm.c | 95
1 file changed, 95 insertions(+)
diff --git a/mm/hmm.c b/mm/hmm.c
index c
THE HARDWARE WILL NO LONGER
ACCESS THE RANGE BECAUSE CALLING THIS HELPER !
Signed-off-by: Jérôme Glisse <jgli...@redhat.com>
---
include/linux/hmm.h | 3 +++
mm/hmm.c| 24
2 files changed, 27 insertions(+)
diff --git a/include/linux/hmm.h b/include/linux
for migration, calling mm_hmm_migrate_cleanup()
is wrong.
Signed-off-by: Jérôme Glisse <jgli...@redhat.com>
Signed-off-by: Sherry Cheung <sche...@nvidia.com>
Signed-off-by: Subhash Gutti <sgu...@nvidia.com>
Signed-off-by: Mark Hairgrove <mhairgr...@nvidia.com>
Signed-off
For memory migrated to device we need a new type of memory entry.
Signed-off-by: Jérôme Glisse <jgli...@redhat.com>
Signed-off-by: Sherry Cheung <sche...@nvidia.com>
Signed-off-by: Subhash Gutti <sgu...@nvidia.com>
Signed-off-by: Mark Hairgrove <mhairgr...@nvidia.com>
Sig
.
- Export mirror ref/unref functions.
- English syntax fixes.
Changed since v4:
- Properly reference existing hmm struct if any.
Signed-off-by: Jérôme Glisse <jgli...@redhat.com>
Signed-off-by: Sherry Cheung <sche...@nvidia.com>
Signed-off-by: Subhash Gutti <sgu...@nvidia.com>
S
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