search for: dmirror_chunk

On 3/17/20 5:59 AM, Christoph Hellwig wrote: > On Tue, Mar 17, 2020 at 09:47:55AM -0300, Jason Gunthorpe wrote: >> I've been using v7 of Ralph's tester and it is working well - it has >> DEVICE_PRIVATE support so I think it can test this flow too. Ralph are >> you able? >> >> This hunk seems trivial enough to me, can we include it now? > > I can send

...otifier holds a mmgrab, no need for another one > + /* Only the first open registers the address space. */ > + filp->private_data = dmirror; Not sure what this comment means > +static inline struct dmirror_device *dmirror_page_to_device(struct page *page) > + > +{ > + struct dmirror_chunk *devmem; > + > + devmem = container_of(page->pgmap, struct dmirror_chunk, pagemap); > + return devmem->mdevice; > +} extra devmem var is not really needed > + > +static bool dmirror_device_is_mine(struct dmirror_device *mdevice, > + struct page *page) > +{ >...

...n() system call with the device. * Subsequent file opens by other processes will have access to the * first process' address space. */ >> +static inline struct dmirror_device *dmirror_page_to_device(struct page *page) >> + >> +{ >> + struct dmirror_chunk *devmem; >> + >> + devmem = container_of(page->pgmap, struct dmirror_chunk, pagemap); >> + return devmem->mdevice; >> +} > > extra devmem var is not really needed I'll change this to: return container_of(page->pgmap, struct dmirror_chunk, pagemap...

These changes are based on Jason's latest hmm branch. Patch 1 was previously posted here [1] but was dropped from the orginal series. Hopefully, the tests will reduce concerns about edge conditions. I'm sure more tests could be usefully added but I thought this was a good starting point. [1] https://lore.kernel.org/linux-mm/20190726005650.2566-6-rcampbell at nvidia.com/ Ralph Campbell

This series adds new functions to the mmu interval notifier API to allow device drivers with MMUs to dynamically mirror a process' page tables based on device faults and invalidation callbacks. The Nouveau driver is updated to use the extended API and a set of stand alone self tests is added to help validate and maintain correctness. The patches are based on linux-5.5.0-rc6 and are for

..._huge_pages; spinlock_t lock; /* protects the above */ }; @@ -443,6 +444,7 @@ static int dmirror_write(struct dmirror *dmirror, struct hmm_dmirror_cmd *cmd) } static bool dmirror_allocate_chunk(struct dmirror_device *mdevice, + bool is_huge, struct page **ppage) { struct dmirror_chunk *devmem; @@ -502,16 +504,39 @@ static bool dmirror_allocate_chunk(struct dmirror_device *mdevice, pfn_first, pfn_last); spin_lock(&mdevice->lock); - for (pfn = pfn_first; pfn < pfn_last; pfn++) { + for (pfn = pfn_first; pfn < pfn_last; ) { struct page *page = pfn_to_page(pfn)...

This series adds support for transparent huge page migration to migrate_vma_*() and adds nouveau SVM and HMM selftests as consumers. Earlier versions were posted previously [1] and [2]. The patches apply cleanly to the linux-mm 5.10.0-rc2 tree. There are a lot of other THP patches being posted. I don't think there are any semantic conflicts but there may be some merge conflicts depending on

This series adds support for transparent huge page migration to migrate_vma_*() and adds nouveau SVM and HMM selftests as consumers. An earlier version was posted previously [1]. This version now supports splitting a THP midway in the migration process which led to a number of changes. The patches apply cleanly to the current linux-mm tree. Since there are a couple of patches in linux-mm from Dan

These patches apply to linux-5.8.0-rc1. Patches 1-3 should probably go into 5.8, the others can be queued for 5.9. Patches 4-6 improve the HMM self tests. Patch 7-8 prepare nouveau for the meat of this series which adds support and testing for compound page mapping of system memory (patches 9-11) and compound page migration to device private memory (patches 12-16). Since these changes are split