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drm/amdkfd: Remove prefault before migrating to VRAM

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Prefaulting potentially allocates system memory pages before a
migration. This adds unnecessary overhead. Instead we can skip
unallocated pages in the migration and just point migrate->dst to a
0-initialized VRAM page directly. Then the VRAM page will be inserted
to the PTE. A subsequent CPU page fault will migrate the page back to
system memory.

Signed-off-by: Philip Yang <Philip.Yang@amd.com>
Reviewed-by: Felix Kuehling <Felix.Kuehling@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Philip Yang
2022-07-26 15:13:30 -04:00
committed by Alex Deucher
parent e1f84eef31
commit c969c5fd21
3 changed files with 5 additions and 31 deletions
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2
drivers/gpu/drm/amd/amdkfd/kfd_svm.h
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@@ -181,8 +181,6 @@ void schedule_deferred_list_work(struct svm_range_list *svms);
void svm_range_dma_unmap(struct device *dev, dma_addr_t *dma_addr,
unsigned long offset, unsigned long npages);
void svm_range_free_dma_mappings(struct svm_range *prange);
void svm_range_prefault(struct svm_range *prange, struct mm_struct *mm,
void *owner);
int svm_range_get_info(struct kfd_process *p, uint32_t *num_svm_ranges,
uint64_t *svm_priv_data_size);
int kfd_criu_checkpoint_svm(struct kfd_process *p,