Merge branch 'davinci_emac'

[~andy/linux] / mm / Kconfig

diff --git a/mm/Kconfig b/mm/Kconfig
index 723bbe04a0b0511976d3778a4df94cb2974eb9c8..2888024e0b0abea6b6f37f4531ad0f8dfec5c7b3 100644 (file)
--- 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:
+         https://github.com/spartacus06/zsmapbench