diff options
Diffstat (limited to 'mm/mempolicy.c')
| -rw-r--r-- | mm/mempolicy.c | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/mm/mempolicy.c b/mm/mempolicy.c index b190cd456acec..58e3dfa2f83a3 100644 --- a/mm/mempolicy.c +++ b/mm/mempolicy.c @@ -1743,6 +1743,34 @@ COMPAT_SYSCALL_DEFINE4(migrate_pages, compat_pid_t, pid, #endif /* CONFIG_COMPAT */ +bool vma_migratable(struct vm_area_struct *vma) +{ + if (vma->vm_flags & (VM_IO | VM_PFNMAP)) + return false; + + /* + * DAX device mappings require predictable access latency, so avoid + * incurring periodic faults. + */ + if (vma_is_dax(vma)) + return false; + + if (is_vm_hugetlb_page(vma) && + !hugepage_migration_supported(hstate_vma(vma))) + return false; + + /* + * Migration allocates pages in the highest zone. If we cannot + * do so then migration (at least from node to node) is not + * possible. + */ + if (vma->vm_file && + gfp_zone(mapping_gfp_mask(vma->vm_file->f_mapping)) + < policy_zone) + return false; + return true; +} + struct mempolicy *__get_vma_policy(struct vm_area_struct *vma, unsigned long addr) { |