In current code, zonelist is considered to be build once, no modification.
But MemoryHotplug can add new zone/pgdat. It must be updated.
This patch modifies build_all_zonelists().
By this, build_all_zonelist() can reconfig pgdat's zonelists.
To update them safety, this patch use stop_machine_run().
Other cpus don't touch among updating them by using it.
In previous version (V2), kernel updated them after zone initialization.
But present_page of its new zone is still 0, because online_page()
is not called yet at this time.
Build_zonelists() checks present_pages to find present zone.
It was too early. So, I changed it after online_pages().
Signed-off-by: Yasunori Goto <[email protected]>
Signed-off-by: KAMEZAWA Hiroyuki <[email protected]>
Index: pgdat6/mm/page_alloc.c
===================================================================
--- pgdat6.orig/mm/page_alloc.c 2006-03-06 21:08:35.000000000 +0900
+++ pgdat6/mm/page_alloc.c 2006-03-06 21:08:46.000000000 +0900
@@ -37,6 +37,7 @@
#include <linux/nodemask.h>
#include <linux/vmalloc.h>
#include <linux/mempolicy.h>
+#include <linux/stop_machine.h>
#include <asm/tlbflush.h>
#include "internal.h"
@@ -1761,14 +1762,29 @@ static void __meminit build_zonelists(pg
#endif /* CONFIG_NUMA */
-void __init build_all_zonelists(void)
+/* return values int ....just for stop_machine_run() */
+static int __meminit __build_all_zonelists(void *dummy)
{
- int i;
+ int nid;
+ for_each_online_node(nid)
+ build_zonelists(NODE_DATA(nid));
+ return 0;
+}
+
+void __meminit build_all_zonelists(void)
+{
+ if (system_state == SYSTEM_BOOTING) {
+ __build_all_zonelists(0);
+ cpuset_init_current_mems_allowed();
+ } else {
+ /* we have to stop all cpus to guaranntee there is no user
+ of zonelist */
+ stop_machine_run(__build_all_zonelists, NULL, NR_CPUS);
+ /* cpuset refresh routine should be here */
+ }
- for_each_online_node(i)
- build_zonelists(NODE_DATA(i));
printk("Built %i zonelists\n", num_online_nodes());
- cpuset_init_current_mems_allowed();
+
}
/*
Index: pgdat6/mm/memory_hotplug.c
===================================================================
--- pgdat6.orig/mm/memory_hotplug.c 2006-03-06 21:07:19.000000000 +0900
+++ pgdat6/mm/memory_hotplug.c 2006-03-06 21:08:46.000000000 +0900
@@ -123,6 +123,7 @@ int online_pages(unsigned long pfn, unsi
unsigned long flags;
unsigned long onlined_pages = 0;
struct zone *zone;
+ int need_refresh_zonelist = 0;
/*
* This doesn't need a lock to do pfn_to_page().
@@ -135,6 +136,14 @@ int online_pages(unsigned long pfn, unsi
grow_pgdat_span(zone->zone_pgdat, pfn, pfn + nr_pages);
pgdat_resize_unlock(zone->zone_pgdat, &flags);
+ /*
+ * If this zone is not populated, then it is not in zonelist.
+ * This means the page allocator ignores this zone.
+ * So, zonelist must be updated after online.
+ */
+ if (!populated_zone(zone))
+ need_refresh_zonelist = 1;
+
for (i = 0; i < nr_pages; i++) {
struct page *page = pfn_to_page(pfn + i);
online_page(page);
@@ -144,6 +153,9 @@ int online_pages(unsigned long pfn, unsi
setup_per_zone_pages_min();
+ if (need_refresh_zonelist)
+ build_all_zonelists();
+
return 0;
}
--
Yasunori Goto
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