X-Git-Url: http://drtracing.org/?a=blobdiff_plain;f=mm%2FKconfig;h=e79de2bd12cd046c416537b8c6550ca3aea95a01;hb=a52bd79e3ef683808e129c7627e8878ea0309459;hp=c180af880ed5169cdbf1799c0650b61d68130990;hpb=5c3950970b91df6a15db66ec4498bac9b12f4002;p=deliverable%2Flinux.git

diff --git a/mm/Kconfig b/mm/Kconfig
index c180af880ed5..e79de2bd12cd 100644
--- a/mm/Kconfig
+++ b/mm/Kconfig
@@ -636,3 +636,21 @@ config MAX_STACK_SIZE_MB
 	  changed to a smaller value in which case that is used.
 
 	  A sane initial value is 80 MB.
+
+# For architectures that support deferred memory initialisation
+config ARCH_SUPPORTS_DEFERRED_STRUCT_PAGE_INIT
+	bool
+
+config DEFERRED_STRUCT_PAGE_INIT
+	bool "Defer initialisation of struct pages to kswapd"
+	default n
+	depends on ARCH_SUPPORTS_DEFERRED_STRUCT_PAGE_INIT
+	depends on MEMORY_HOTPLUG
+	help
+	  Ordinarily all struct pages are initialised during early boot in a
+	  single thread. On very large machines this can take a considerable
+	  amount of time. If this option is set, large machines will bring up
+	  a subset of memmap at boot and then initialise the rest in parallel
+	  when kswapd starts. This has a potential performance impact on
+	  processes running early in the lifetime of the systemm until kswapd
+	  finishes the initialisation.