mm: extract reclaim code from __alloc_pages_direct_reclaim()

This patch extracts common reclaim code from __alloc_pages_direct_reclaim()
function to separate function: __perform_reclaim() which can be later used
by alloc_contig_range().

Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Cc: Michal Nazarewicz <mina86@mina86.com>
Acked-by: Mel Gorman <mel@csn.ul.ie>
Tested-by: Rob Clark <rob.clark@linaro.org>
Tested-by: Ohad Ben-Cohen <ohad@wizery.com>
Tested-by: Benjamin Gaignard <benjamin.gaignard@linaro.org>
Tested-by: Robert Nelson <robertcnelson@gmail.com>
Tested-by: Barry Song <Baohua.Song@csr.com>

1 files changed, 21 insertions, 9 deletions

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 8be37bcda0b2..4615531dcf66 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -2130,16 +2130,13 @@ __alloc_pages_direct_compact(gfp_t gfp_mask, unsigned int order,
 }
 #endif /* CONFIG_COMPACTION */
 
-/* The really slow allocator path where we enter direct reclaim */
-static inline struct page *
-__alloc_pages_direct_reclaim(gfp_t gfp_mask, unsigned int order,
-        struct zonelist *zonelist, enum zone_type high_zoneidx,
-        nodemask_t *nodemask, int alloc_flags, struct zone *preferred_zone,
-        int migratetype, unsigned long *did_some_progress)
+/* Perform direct synchronous page reclaim */
+static int
+__perform_reclaim(gfp_t gfp_mask, unsigned int order, struct zonelist *zonelist,
+                  nodemask_t *nodemask)
 {
-        struct page *page = NULL;
         struct reclaim_state reclaim_state;
-        bool drained = false;
+        int progress;
 
         cond_resched();
 
@@ -2150,7 +2147,7 @@ __alloc_pages_direct_reclaim(gfp_t gfp_mask, unsigned int order,
         reclaim_state.reclaimed_slab = 0;
         current->reclaim_state = &reclaim_state;
 
-        *did_some_progress = try_to_free_pages(zonelist, order, gfp_mask, nodemask);
+        progress = try_to_free_pages(zonelist, order, gfp_mask, nodemask);
 
         current->reclaim_state = NULL;
         lockdep_clear_current_reclaim_state();
@@ -2158,6 +2155,21 @@ __alloc_pages_direct_reclaim(gfp_t gfp_mask, unsigned int order,
 
         cond_resched();
 
+        return progress;
+}
+
+/* The really slow allocator path where we enter direct reclaim */
+static inline struct page *
+__alloc_pages_direct_reclaim(gfp_t gfp_mask, unsigned int order,
+        struct zonelist *zonelist, enum zone_type high_zoneidx,
+        nodemask_t *nodemask, int alloc_flags, struct zone *preferred_zone,
+        int migratetype, unsigned long *did_some_progress)
+{
+        struct page *page = NULL;
+        bool drained = false;
+
+        *did_some_progress = __perform_reclaim(gfp_mask, order, zonelist,
+                                               nodemask);
         if (unlikely(!(*did_some_progress)))
                 return NULL;