1 files changed, 25 insertions, 0 deletions

diff --git a/mm/Kconfig b/mm/Kconfig
index 723bbe04a0b0..2d9f1504d75e 100644
--- a/mm/Kconfig
+++ b/mm/Kconfig
@@ -552,3 +552,28 @@ config MEM_SOFT_DIRTY
           it can be cleared by hands.
 
           See Documentation/vm/soft-dirty.txt for more details.
+
+config ZSMALLOC
+        bool "Memory allocator for compressed pages"
+        depends on MMU
+        default n
+        help
+          zsmalloc is a slab-based memory allocator designed to store
+          compressed RAM pages.  zsmalloc uses virtual memory mapping
+          in order to reduce fragmentation.  However, this results in a
+          non-standard allocator interface where a handle, not a pointer, is
+          returned by an alloc().  This handle must be mapped in order to
+          access the allocated space.
+
+config PGTABLE_MAPPING
+        bool "Use page table mapping to access object in zsmalloc"
+        depends on ZSMALLOC
+        help
+          By default, zsmalloc uses a copy-based object mapping method to
+          access allocations that span two pages. However, if a particular
+          architecture (ex, ARM) performs VM mapping faster than copying,
+          then you should select this. This causes zsmalloc to use page table
+          mapping rather than copying for object mapping.
+
+          You can check speed with zsmalloc benchmark[1].
+          [1] https://github.com/spartacus06/zsmalloc