diff options
| -rw-r--r-- | mm/mempolicy.c | 55 |
1 files changed, 50 insertions, 5 deletions
diff --git a/mm/mempolicy.c b/mm/mempolicy.c index 0594362f24708..5e472e6e0507c 100644 --- a/mm/mempolicy.c +++ b/mm/mempolicy.c @@ -428,6 +428,11 @@ static bool strictly_unmovable(unsigned long flags) MPOL_MF_STRICT; } +struct migration_mpol { /* for alloc_migration_target_by_mpol() */ + struct mempolicy *pol; + pgoff_t ilx; +}; + struct queue_pages { struct list_head *pagelist; unsigned long flags; @@ -1156,8 +1161,9 @@ int do_migrate_pages(struct mm_struct *mm, const nodemask_t *from, static struct folio *alloc_migration_target_by_mpol(struct folio *src, unsigned long private) { - struct mempolicy *pol = (struct mempolicy *)private; - pgoff_t ilx = 0; /* improve on this later */ + struct migration_mpol *mmpol = (struct migration_mpol *)private; + struct mempolicy *pol = mmpol->pol; + pgoff_t ilx = mmpol->ilx; struct page *page; unsigned int order; int nid = numa_node_id(); @@ -1212,6 +1218,7 @@ static long do_mbind(unsigned long start, unsigned long len, struct mm_struct *mm = current->mm; struct vm_area_struct *vma, *prev; struct vma_iterator vmi; + struct migration_mpol mmpol; struct mempolicy *new; unsigned long end; long err; @@ -1284,17 +1291,55 @@ static long do_mbind(unsigned long start, unsigned long len, } } - mmap_write_unlock(mm); - if (!err && !list_empty(&pagelist)) { /* Convert MPOL_DEFAULT's NULL to task or default policy */ if (!new) { new = get_task_policy(current); mpol_get(new); } + mmpol.pol = new; + mmpol.ilx = 0; + + /* + * In the interleaved case, attempt to allocate on exactly the + * targeted nodes, for the first VMA to be migrated; for later + * VMAs, the nodes will still be interleaved from the targeted + * nodemask, but one by one may be selected differently. + */ + if (new->mode == MPOL_INTERLEAVE) { + struct page *page; + unsigned int order; + unsigned long addr = -EFAULT; + + list_for_each_entry(page, &pagelist, lru) { + if (!PageKsm(page)) + break; + } + if (!list_entry_is_head(page, &pagelist, lru)) { + vma_iter_init(&vmi, mm, start); + for_each_vma_range(vmi, vma, end) { + addr = page_address_in_vma(page, vma); + if (addr != -EFAULT) + break; + } + } + if (addr != -EFAULT) { + order = compound_order(page); + /* We already know the pol, but not the ilx */ + mpol_cond_put(get_vma_policy(vma, addr, order, + &mmpol.ilx)); + /* Set base from which to increment by index */ + mmpol.ilx -= page->index >> order; + } + } + } + + mmap_write_unlock(mm); + + if (!err && !list_empty(&pagelist)) { nr_failed |= migrate_pages(&pagelist, alloc_migration_target_by_mpol, NULL, - (unsigned long)new, MIGRATE_SYNC, + (unsigned long)&mmpol, MIGRATE_SYNC, MR_MEMPOLICY_MBIND, NULL); } |