[patch 1/8] mempool - Add page allocator

[Matthew Dobson]

plain text document attachment (mempool-add_page_allocator.patch)
Add an allocator to the common mempool code: a simple page allocator

This will be used by the next patch in the series to replace duplicate
mempool-backed page allocators in 2 places in the kernel.  It is also
likely that there will be more users in the future.

Signed-off-by: Matthew Dobson <colpatch@xxxxxxxxxx>

 include/linux/mempool.h |   12 ++++++++++++
 mm/mempool.c            |   18 ++++++++++++++++++
 2 files changed, 30 insertions(+)

Index: linux-2.6.16-rc1-mm4+mempool_work/mm/mempool.c
===================================================================
--- linux-2.6.16-rc1-mm4+mempool_work.orig/mm/mempool.c
+++ linux-2.6.16-rc1-mm4+mempool_work/mm/mempool.c
@@ -289,3 +289,21 @@ void mempool_free_slab(void *element, vo
 	kmem_cache_free(mem, element);
 }
 EXPORT_SYMBOL(mempool_free_slab);
+
+/*
+ * A simple mempool-backed page allocator that allocates pages
+ * of the order specified by pool_data.
+ */
+void *mempool_alloc_pages(gfp_t gfp_mask, void *pool_data)
+{
+	int order = (int) pool_data;
+	return alloc_pages(gfp_mask, order);
+}
+EXPORT_SYMBOL(mempool_alloc_pages);
+
+void mempool_free_pages(void *element, void *pool_data)
+{
+	int order = (int) pool_data;
+	__free_pages(element, order);
+}
+EXPORT_SYMBOL(mempool_free_pages);
Index: linux-2.6.16-rc1-mm4+mempool_work/include/linux/mempool.h
===================================================================
--- linux-2.6.16-rc1-mm4+mempool_work.orig/include/linux/mempool.h
+++ linux-2.6.16-rc1-mm4+mempool_work/include/linux/mempool.h
@@ -38,4 +38,16 @@ extern void mempool_free(void *element, 
 void *mempool_alloc_slab(gfp_t gfp_mask, void *pool_data);
 void mempool_free_slab(void *element, void *pool_data);
 
+/*
+ * A mempool_alloc_t and mempool_free_t for a simple page allocator that
+ * allocates pages of the order specified by pool_data
+ */
+void *mempool_alloc_pages(gfp_t gfp_mask, void *pool_data);
+void mempool_free_pages(void *element, void *pool_data);
+static inline mempool_t *mempool_create_page_pool(int min_nr, int order)
+{
+	return mempool_create(min_nr, mempool_alloc_pages, mempool_free_pages,
+			      (void *) order);
+}
+
 #endif /* _LINUX_MEMPOOL_H */

--

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