Re: [PATCH 2.6.17-rc1-mm1 4/6] Migrate-on-fault - handle misplaced anon pages

[Lee Schermerhorn <Lee.Schermerhorn@hp.com>]

Migrate-on-fault prototype 4/6 V0.2 - handle misplaced anon pages

V0.2 -- refreshed against 2.6.16-mm2 [no changes for 2.6.17-rc1-mm1]

This patch simply hooks the anon page fault handler [do_swap_page()]
to check for and migrate misplaced pages.

File and shmem fault paths will be addressed in separate patches.

Signed-off-by:  Lee Schermerhorn <lee.schermerhorn@hp.com>

Index: linux-2.6.16-mm2/mm/memory.c
===================================================================
--- linux-2.6.16-mm2.orig/mm/memory.c	2006-03-28 12:00:46.000000000 -0500
+++ linux-2.6.16-mm2/mm/memory.c	2006-03-28 12:01:07.000000000 -0500
@@ -48,6 +48,7 @@
 #include <linux/rmap.h>
 #include <linux/module.h>
 #include <linux/init.h>
+#include <linux/mempolicy.h>	/* check_migrate_misplaced_page() */
 
 #include <asm/pgalloc.h>
 #include <asm/uaccess.h>
@@ -1924,6 +1925,8 @@ again:
 
 	/* The page isn't present yet, go ahead with the fault. */
 
+	page = check_migrate_misplaced_page(page, vma, address);
+
 	inc_mm_counter(mm, anon_rss);
 	pte = mk_pte(page, vma->vm_page_prot);
 	if (write_access && can_share_swap_page(page)) {


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