ce exclusive access? Do we have any numbers for the worst
case page fault latency when something is marked away for exclusive access?
I presume for now this is anonymous memory only? SWP_DEVICE_EXCLUSIVE would
only impact the address space of programs using the GPU. Should the exclusively
marked range live i
On Wed, May 26, 2021 at 12:17:18AM -0700, John Hubbard wrote:
> On 5/25/21 4:51 AM, Balbir Singh wrote:
> ...
> > > How beneficial is this code to nouveau users? I see that it permits a
> > > part of OpenCL to be implemented, but how useful/important is this in
> > &
On 3/7/25 10:08, Matthew Brost wrote:
> On Thu, Mar 06, 2025 at 03:42:28PM +1100, Balbir Singh wrote:
>
> This is an exciting series to see. As of today, we have just merged this
> series into the DRM subsystem / Xe [2], which adds very basic SVM
> support. One of the performance
c: Matthew Wilcox
Cc: Peter Xu
Cc: Zi Yan
Cc: Kefeng Wang
Cc: Jane Chu
Cc: Alistair Popple
Cc: Donet Tom
Balbir Singh (11):
mm/zone_device: support large zone device private folios
mm/migrate_device: flags for selecting device private THP pages
mm/thp: zone_device awareness in THP han
Add flags to mark zone device migration pages.
MIGRATE_VMA_SELECT_COMPOUND will be used to select THP pages during
migrate_vma_setup() and MIGRATE_PFN_COMPOUND will make migrating
device pages as compound pages during device pfn migration.
Signed-off-by: Balbir Singh
---
include/linux
will be added in future patches in this
series.
Signed-off-by: Balbir Singh
---
lib/test_hmm.c | 342 +++--
1 file changed, 273 insertions(+), 69 deletions(-)
diff --git a/lib/test_hmm.c b/lib/test_hmm.c
index 5b144bc5c4ec..a81d2f8a0426 100644
--- a/lib
requires a mechanism of reorganizing
the backing pages (backing pages are used to create a mirror device)
again into the right sized order pages. This is supported by exporting
prep_compound_page().
Signed-off-by: Balbir Singh
---
include/linux/memremap.h | 7 +++
include/linux/mm.h
code paths, an extra reference
count is added to the split folio pages, which will be dropped in
the finalize phase.
Signed-off-by: Balbir Singh
---
include/linux/huge_mm.h | 11 ++--
mm/huge_memory.c| 53 +---
mm/migrate_device.c | 60
When the CPU touches a zone device THP entry, the data needs to
be migrated back to the CPU, call migrate_to_ram() on these pages
via do_huge_pmd_device_private() fault handling helper.
Signed-off-by: Balbir Singh
---
include/linux/huge_mm.h | 7 +++
mm/huge_memory.c| 35
re is fallback support to split the folio
and migrate it.
migrate_vma_insert_huge_pmd_page() closely follows the logic of
migrate_vma_insert_page()
Support for splitting pages as needed for migration will follow in
later patches in this series.
Signed-off-by: Balbir Singh
---
mm/migrate_device.c
Change the code to add support for MIGRATE_VMA_SELECT_COMPOUND
and appropriately handling page sizes in the migrate/evict
code paths.
Signed-off-by: Balbir Singh
---
drivers/gpu/drm/nouveau/nouveau_dmem.c | 244 +
drivers/gpu/drm/nouveau/nouveau_svm.c | 6 +-
drivers
Add a new flag HMM_DMIRROR_FLAG_FAIL_ALLOC to emulate
failure of allocating a large page. This tests the code paths
involving split migration.
Signed-off-by: Balbir Singh
---
lib/test_hmm.c | 12 +++-
lib/test_hmm_uapi.h | 3 +++
2 files changed, 14 insertions(+), 1 deletion
Add new tests for migrating anon THP pages, including anon_huge,
anon_huge_zero and error cases involving forced splitting of pages
during migration.
Signed-off-by: Balbir Singh
---
tools/testing/selftests/mm/hmm-tests.c | 407 +
1 file changed, 407 insertions(+)
diff
freed, this is true for both
PAGE_SIZE and higher order pages.
Signed-off-by: Balbir Singh
---
include/linux/memremap.h | 22 +-
mm/memremap.c| 50 +---
2 files changed, 58 insertions(+), 14 deletions(-)
diff --git a/include/linux
On 3/6/25 20:24, Mika Penttilä wrote:
> Hi,
>
> On 3/6/25 06:42, Balbir Singh wrote:
> ...
>
>>
>> /*
>> * The only time there is no vma is when called from
>> @@ -728,15 +1000,47 @@ static void __migrate_d
.
try_to_map_to_unused_zeropage() does not apply to zone device
entries, zone device entries are ignored in the call.
Signed-off-by: Balbir Singh
---
mm/huge_memory.c | 151 +++
mm/migrate.c | 2 +
mm/page_vma_mapped.c | 10 +++
mm/rmap.c| 19 +-
4
On 3/6/25 19:16, Mika Penttilä wrote:
> Hi,
>
> On 3/6/25 06:42, Balbir Singh wrote:
>> When a zone device page is split (via huge pmd folio split). The
>> driver callback for folio_split is invoked to let the device driver
>> know that the folio size has been
On 7/8/25 23:37, David Hildenbrand wrote:
> On 06.03.25 05:42, Balbir Singh wrote:
>> Add routines to support allocation of large order zone device folios
>> and helper functions for zone device folios, to check if a folio is
>> device private and helpers for setting zone de
On 7/8/25 23:41, David Hildenbrand wrote:
> On 06.03.25 05:42, Balbir Singh wrote:
>> Add flags to mark zone device migration pages.
>>
>> MIGRATE_VMA_SELECT_COMPOUND will be used to select THP pages during
>> migrate_vma_setup() and MIGRATE_PFN_COMPOUND will make m
On 7/9/25 00:10, David Hildenbrand wrote:
> On 06.03.25 05:42, Balbir Singh wrote:
>> Make THP handling code in the mm subsystem for THP pages
>> aware of zone device pages. Although the code is
>> designed to be generic when it comes to handling splitting
>> of pages, t
On 7/9/25 00:40, David Hildenbrand wrote:
> On 06.03.25 05:42, Balbir Singh wrote:
>> When the CPU touches a zone device THP entry, the data needs to
>> be migrated back to the CPU, call migrate_to_ram() on these pages
>> via do_huge_pmd_device_private() fault handling helper
On 7/9/25 00:31, David Hildenbrand wrote:
> On 06.03.25 05:42, Balbir Singh wrote:
>> When a zone device page is split (via huge pmd folio split). The
>> driver callback for folio_split is invoked to let the device driver
>> know that the folio size has been split into a sma
On 7/5/25 02:17, Zi Yan wrote:
> On 4 Jul 2025, at 9:52, Francois Dugast wrote:
>
>> Hi,
>>
>> On Fri, Mar 07, 2025 at 10:20:30AM +1100, Balbir Singh wrote:
>>> On 3/7/25 10:08, Matthew Brost wrote:
>>>> On Thu, Mar 06, 2025 at 03:42:28PM +1100, Balb
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