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authorAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-12-15 14:52:16 -0300
committerAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-12-15 14:52:16 -0300
commit8d91c1e411f55d7ea91b1183a2e9f8088fb4d5be (patch)
treee9891aa6c295060d065adffd610c4f49ecf884f3 /mm/swap_state.c
parenta71852147516bc1cb5b0b3cbd13639bfd4022dc8 (diff)
Linux-libre 4.3.2-gnu
Diffstat (limited to 'mm/swap_state.c')
-rw-r--r--mm/swap_state.c37
1 files changed, 26 insertions, 11 deletions
diff --git a/mm/swap_state.c b/mm/swap_state.c
index 8bc8e6613..d504adb7f 100644
--- a/mm/swap_state.c
+++ b/mm/swap_state.c
@@ -288,17 +288,14 @@ struct page * lookup_swap_cache(swp_entry_t entry)
return page;
}
-/*
- * Locate a page of swap in physical memory, reserving swap cache space
- * and reading the disk if it is not already cached.
- * A failure return means that either the page allocation failed or that
- * the swap entry is no longer in use.
- */
-struct page *read_swap_cache_async(swp_entry_t entry, gfp_t gfp_mask,
- struct vm_area_struct *vma, unsigned long addr)
+struct page *__read_swap_cache_async(swp_entry_t entry, gfp_t gfp_mask,
+ struct vm_area_struct *vma, unsigned long addr,
+ bool *new_page_allocated)
{
struct page *found_page, *new_page = NULL;
+ struct address_space *swapper_space = swap_address_space(entry);
int err;
+ *new_page_allocated = false;
do {
/*
@@ -306,8 +303,7 @@ struct page *read_swap_cache_async(swp_entry_t entry, gfp_t gfp_mask,
* called after lookup_swap_cache() failed, re-calling
* that would confuse statistics.
*/
- found_page = find_get_page(swap_address_space(entry),
- entry.val);
+ found_page = find_get_page(swapper_space, entry.val);
if (found_page)
break;
@@ -366,7 +362,7 @@ struct page *read_swap_cache_async(swp_entry_t entry, gfp_t gfp_mask,
* Initiate read into locked page and return.
*/
lru_cache_add_anon(new_page);
- swap_readpage(new_page);
+ *new_page_allocated = true;
return new_page;
}
radix_tree_preload_end();
@@ -384,6 +380,25 @@ struct page *read_swap_cache_async(swp_entry_t entry, gfp_t gfp_mask,
return found_page;
}
+/*
+ * Locate a page of swap in physical memory, reserving swap cache space
+ * and reading the disk if it is not already cached.
+ * A failure return means that either the page allocation failed or that
+ * the swap entry is no longer in use.
+ */
+struct page *read_swap_cache_async(swp_entry_t entry, gfp_t gfp_mask,
+ struct vm_area_struct *vma, unsigned long addr)
+{
+ bool page_was_allocated;
+ struct page *retpage = __read_swap_cache_async(entry, gfp_mask,
+ vma, addr, &page_was_allocated);
+
+ if (page_was_allocated)
+ swap_readpage(retpage);
+
+ return retpage;
+}
+
static unsigned long swapin_nr_pages(unsigned long offset)
{
static unsigned long prev_offset;