diff options
Diffstat (limited to 'mm/swap_state.c')
| -rw-r--r-- | mm/swap_state.c | 34 |
1 files changed, 11 insertions, 23 deletions
diff --git a/mm/swap_state.c b/mm/swap_state.c index 470038a9187..9d3dd3763cf 100644 --- a/mm/swap_state.c +++ b/mm/swap_state.c @@ -300,16 +300,6 @@ struct page *read_swap_cache_async(swp_entry_t entry, gfp_t gfp_mask, new_page = alloc_page_vma(gfp_mask, vma, addr); if (!new_page) break; /* Out of memory */ - /* - * The memcg-specific accounting when moving - * pages around the LRU lists relies on the - * page's owner (memcg) to be valid. Usually, - * pages are assigned to a new owner before - * being put on the LRU list, but since this - * is not the case here, the stale owner from - * a previous allocation cycle must be reset. - */ - mem_cgroup_reset_owner(new_page); } /* @@ -382,25 +372,23 @@ struct page *read_swap_cache_async(swp_entry_t entry, gfp_t gfp_mask, struct page *swapin_readahead(swp_entry_t entry, gfp_t gfp_mask, struct vm_area_struct *vma, unsigned long addr) { - int nr_pages; struct page *page; - unsigned long offset; - unsigned long end_offset; + unsigned long offset = swp_offset(entry); + unsigned long start_offset, end_offset; + unsigned long mask = (1UL << page_cluster) - 1; - /* - * Get starting offset for readaround, and number of pages to read. - * Adjust starting address by readbehind (for NUMA interleave case)? - * No, it's very unlikely that swap layout would follow vma layout, - * more likely that neighbouring swap pages came from the same node: - * so use the same "addr" to choose the same node for each swap read. - */ - nr_pages = valid_swaphandles(entry, &offset); - for (end_offset = offset + nr_pages; offset < end_offset; offset++) { + /* Read a page_cluster sized and aligned cluster around offset. */ + start_offset = offset & ~mask; + end_offset = offset | mask; + if (!start_offset) /* First page is swap header. */ + start_offset++; + + for (offset = start_offset; offset <= end_offset ; offset++) { /* Ok, do the async read-ahead now */ page = read_swap_cache_async(swp_entry(swp_type(entry), offset), gfp_mask, vma, addr); if (!page) - break; + continue; page_cache_release(page); } lru_add_drain(); /* Push any new pages onto the LRU now */ |