diff options
Diffstat (limited to 'mm/memory.c')
| -rw-r--r-- | mm/memory.c | 23 |
1 files changed, 18 insertions, 5 deletions
diff --git a/mm/memory.c b/mm/memory.c index 3dd8bb46391b..e87953775e3c 100644 --- a/mm/memory.c +++ b/mm/memory.c @@ -2752,16 +2752,23 @@ EXPORT_SYMBOL(unmap_mapping_range); int do_swap_page(struct vm_fault *vmf) { struct vm_area_struct *vma = vmf->vma; - struct page *page, *swapcache; + struct page *page = NULL, *swapcache; struct mem_cgroup *memcg; + struct vma_swap_readahead swap_ra; swp_entry_t entry; pte_t pte; int locked; int exclusive = 0; int ret = 0; + bool vma_readahead = swap_use_vma_readahead(); - if (!pte_unmap_same(vma->vm_mm, vmf->pmd, vmf->pte, vmf->orig_pte)) + if (vma_readahead) + page = swap_readahead_detect(vmf, &swap_ra); + if (!pte_unmap_same(vma->vm_mm, vmf->pmd, vmf->pte, vmf->orig_pte)) { + if (page) + put_page(page); goto out; + } entry = pte_to_swp_entry(vmf->orig_pte); if (unlikely(non_swap_entry(entry))) { @@ -2777,10 +2784,16 @@ int do_swap_page(struct vm_fault *vmf) goto out; } delayacct_set_flag(DELAYACCT_PF_SWAPIN); - page = lookup_swap_cache(entry); + if (!page) + page = lookup_swap_cache(entry, vma_readahead ? vma : NULL, + vmf->address); if (!page) { - page = swapin_readahead(entry, GFP_HIGHUSER_MOVABLE, vma, - vmf->address); + if (vma_readahead) + page = do_swap_page_readahead(entry, + GFP_HIGHUSER_MOVABLE, vmf, &swap_ra); + else + page = swapin_readahead(entry, + GFP_HIGHUSER_MOVABLE, vma, vmf->address); if (!page) { /* * Back out if somebody else faulted in this pte |