[patch 151/158] mm: shmem: use proper gfp flags for shmem_writepage()

[patch 151/158] mm: shmem: use proper gfp flags for shmem_writepage()

[akpm]

From: Yang Shi <yang.shi@linux.alibaba.com>
Subject: mm: shmem: use proper gfp flags for shmem_writepage()

The shmem_writepage() uses GFP_ATOMIC to allocate swap cache.  GFP_ATOMIC
used to mean __GFP_HIGH, but now it means __GFP_HIGH | __GFP_ATOMIC |
__GFP_KSWAPD_RECLAIM.  However, shmem_writepage() should write out to swap
only in response to memory pressure, so __GFP_KSWAPD_RECLAIM looks useless
since the caller may be kswapd itself or in direct reclaim already.

In addition, XArray node allocations from PF_MEMALLOC contexts could
completely exhaust the page allocator, __GFP_NOMEMALLOC stops emergency
reserves from being allocated.

Here just copy the gfp flags used by add_to_swap().

Hugh: "a cleanup to make the two calls look the same when they don't need
to be different (whereas the call from __read_swap_cache_async() rightly
uses a lower priority gfp)".

Link: http://lkml.kernel.org/r/1572991351-86061-1-git-send-email-yang.shi@linux.alibaba.com
Signed-off-by: Yang Shi <yang.shi@linux.alibaba.com>
Acked-by: Hugh Dickins <hughd@google.com>
Cc: Michal Hocko <mhocko@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 mm/shmem.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/mm/shmem.c~mm-shmem-use-proper-gfp-flags-for-shmem_writepage
+++ a/mm/shmem.c
@@ -1369,7 +1369,8 @@ static int shmem_writepage(struct page *
 	if (list_empty(&info->swaplist))
 		list_add(&info->swaplist, &shmem_swaplist);
 
-	if (add_to_swap_cache(page, swap, GFP_ATOMIC) == 0) {
+	if (add_to_swap_cache(page, swap,
+			__GFP_HIGH | __GFP_NOMEMALLOC | __GFP_NOWARN) == 0) {
 		spin_lock_irq(&info->lock);
 		shmem_recalc_inode(inode);
 		info->swapped++;
_