[PATCH] Swapless page migration: add R/W migration entries

[karo-tx-linux.git] / mm / Kconfig

diff --git a/mm/Kconfig b/mm/Kconfig
index a9cb80ae6409df599cc3823a7a072a158c41112c..332f5c29b53a3c04665e4d727fc50dbfde609fb2 100644 (file)
--- a/mm/Kconfig
+++ b/mm/Kconfig
@@ -137,5 +137,11 @@ config SPLIT_PTLOCK_CPUS
 # support for page migration
 #
 config MIGRATION
-       def_bool y if NUMA || SPARSEMEM || DISCONTIGMEM
-       depends on SWAP
+       bool "Page migration"
+       def_bool y if NUMA
+       depends on SWAP && NUMA
+       help
+         Allows the migration of the physical location of pages of processes
+         while the virtual addresses are not changed. This is useful for
+         example on NUMA systems to put pages nearer to the processors accessing
+         the page.