[RFC] memory hotremove patch take 2 [03/10] (drain all pages)

[Yasunori Goto <y-goto@jp.fujitsu.com>]

This patch add function drain_all_pages(void) to drain all 
pages on per-cpu-freelist.
Page isolation will catch them in free_one_page.

Signed-Off-By: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Signed-off-by: Yasunori Goto <y-goto@jp.fujitsu.com>

 include/linux/page_isolation.h |    1 +
 mm/page_alloc.c                |   13 +++++++++++++
 2 files changed, 14 insertions(+)

Index: current_test/mm/page_alloc.c
===================================================================
--- current_test.orig/mm/page_alloc.c	2007-05-08 15:08:03.000000000 +0900
+++ current_test/mm/page_alloc.c	2007-05-08 15:08:33.000000000 +0900
@@ -1070,6 +1070,19 @@ void drain_all_local_pages(void)
 	smp_call_function(smp_drain_local_pages, NULL, 0, 1);
 }
 
+#ifdef CONFIG_PAGE_ISOLATION
+static void drain_local_zone_pages(struct work_struct *work)
+{
+	drain_local_pages();
+}
+
+void drain_all_pages(void)
+{
+	schedule_on_each_cpu(drain_local_zone_pages);
+}
+
+#endif /* CONFIG_PAGE_ISOLATION */
+
 /*
  * Free a 0-order page
  */
Index: current_test/include/linux/page_isolation.h
===================================================================
--- current_test.orig/include/linux/page_isolation.h	2007-05-08 15:08:03.000000000 +0900
+++ current_test/include/linux/page_isolation.h	2007-05-08 15:08:33.000000000 +0900
@@ -39,6 +39,7 @@ extern void detach_isolation_info_zone(s
 extern void free_isolation_info(struct isolation_info *info);
 extern void unuse_all_isolated_pages(struct isolation_info *info);
 extern void free_all_isolated_pages(struct isolation_info *info);
+extern void drain_all_pages(void);
 
 #else
 

-- 
Yasunori Goto