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-rw-r--r--mm/swap_state.c24
1 files changed, 11 insertions, 13 deletions
diff --git a/mm/swap_state.c b/mm/swap_state.c
index ea6b32d..9d3dd37 100644
--- a/mm/swap_state.c
+++ b/mm/swap_state.c
@@ -372,25 +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 */
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