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-rw-r--r--mm/slub.c30
1 files changed, 27 insertions, 3 deletions
diff --git a/mm/slub.c b/mm/slub.c
index e517d435e5dc..8f78e2577031 100644
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -34,6 +34,8 @@
#include <trace/events/kmem.h>
+#include "internal.h"
+
/*
* Lock order:
* 1. slab_mutex (Global Mutex)
@@ -1354,6 +1356,8 @@ static struct page *new_slab(struct kmem_cache *s, gfp_t flags, int node)
inc_slabs_node(s, page_to_nid(page), page->objects);
page->slab = s;
__SetPageSlab(page);
+ if (page->pfmemalloc)
+ SetPageSlabPfmemalloc(page);
start = page_address(page);
@@ -1397,6 +1401,7 @@ static void __free_slab(struct kmem_cache *s, struct page *page)
NR_SLAB_RECLAIMABLE : NR_SLAB_UNRECLAIMABLE,
-pages);
+ __ClearPageSlabPfmemalloc(page);
__ClearPageSlab(page);
reset_page_mapcount(page);
if (current->reclaim_state)
@@ -2126,6 +2131,14 @@ static inline void *new_slab_objects(struct kmem_cache *s, gfp_t flags,
return freelist;
}
+static inline bool pfmemalloc_match(struct page *page, gfp_t gfpflags)
+{
+ if (unlikely(PageSlabPfmemalloc(page)))
+ return gfp_pfmemalloc_allowed(gfpflags);
+
+ return true;
+}
+
/*
* Check the page->freelist of a page and either transfer the freelist to the per cpu freelist
* or deactivate the page.
@@ -2206,6 +2219,18 @@ redo:
goto new_slab;
}
+ /*
+ * By rights, we should be searching for a slab page that was
+ * PFMEMALLOC but right now, we are losing the pfmemalloc
+ * information when the page leaves the per-cpu allocator
+ */
+ if (unlikely(!pfmemalloc_match(page, gfpflags))) {
+ deactivate_slab(s, page, c->freelist);
+ c->page = NULL;
+ c->freelist = NULL;
+ goto new_slab;
+ }
+
/* must check again c->freelist in case of cpu migration or IRQ */
freelist = c->freelist;
if (freelist)
@@ -2256,11 +2281,11 @@ new_slab:
}
page = c->page;
- if (likely(!kmem_cache_debug(s)))
+ if (likely(!kmem_cache_debug(s) && pfmemalloc_match(page, gfpflags)))
goto load_freelist;
/* Only entered in the debug case */
- if (!alloc_debug_processing(s, page, freelist, addr))
+ if (kmem_cache_debug(s) && !alloc_debug_processing(s, page, freelist, addr))
goto new_slab; /* Slab failed checks. Next slab needed */
deactivate_slab(s, page, get_freepointer(s, freelist));
@@ -2313,7 +2338,6 @@ redo:
object = c->freelist;
page = c->page;
if (unlikely(!object || !node_match(page, node)))
-
object = __slab_alloc(s, gfpflags, node, addr, c);
else {