[PATCH] pgdat allocation for new node add (export kswapd start func)

When node is hot-added, kswapd for the node should start.  This export kswapd
start function as kswapd_run() to use at add_memory().

[akpm@osdl.org: daemonize() isn't needed when using the kthread API]
Signed-off-by: Yasunori Goto <y-goto@jp.fujitsu.com>
Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Dave Hansen <haveblue@us.ibm.com>
Cc: "Brown, Len" <len.brown@intel.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

diff --git a/include/linux/swap.h b/include/linux/swap.h
index dc3f3aa..c41e2d6 100644 (file)
--- a/include/linux/swap.h
+++ b/include/linux/swap.h
@@ -199,6 +199,8 @@ static inline int zone_reclaim(struct zone *z, gfp_t mask, unsigned int order)
 }
 #endif
 
+extern int kswapd_run(int nid);
+
 #ifdef CONFIG_MMU
 /* linux/mm/shmem.c */
 extern int shmem_unuse(swp_entry_t entry, struct page *page);

diff --git a/mm/vmscan.c b/mm/vmscan.c
index 72babac..f03da33 100644 (file)
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -34,6 +34,7 @@
 #include <linux/notifier.h>
 #include <linux/rwsem.h>
 #include <linux/delay.h>
+#include <linux/kthread.h>
 
 #include <asm/tlbflush.h>
 #include <asm/div64.h>
@@ -1223,7 +1224,6 @@ static int kswapd(void *p)
        };
        cpumask_t cpumask;
 
-       daemonize("kswapd%d", pgdat->node_id);
        cpumask = node_to_cpumask(pgdat->node_id);
        if (!cpus_empty(cpumask))
                set_cpus_allowed(tsk, cpumask);
@@ -1468,20 +1468,35 @@ static int cpu_callback(struct notifier_block *nfb,
 }
 #endif /* CONFIG_HOTPLUG_CPU */
 
+/*
+ * This kswapd start function will be called by init and node-hot-add.
+ * On node-hot-add, kswapd will moved to proper cpus if cpus are hot-added.
+ */
+int kswapd_run(int nid)
+{
+       pg_data_t *pgdat = NODE_DATA(nid);
+       int ret = 0;
+
+       if (pgdat->kswapd)
+               return 0;
+
+       pgdat->kswapd = kthread_run(kswapd, pgdat, "kswapd%d", nid);
+       if (IS_ERR(pgdat->kswapd)) {
+               /* failure at boot is fatal */
+               BUG_ON(system_state == SYSTEM_BOOTING);
+               printk("Failed to start kswapd on node %d\n",nid);
+               ret = -1;
+       }
+       return ret;
+}
+
 static int __init kswapd_init(void)
 {
-       pg_data_t *pgdat;
+       int nid;
 
        swap_setup();
-       for_each_online_pgdat(pgdat) {
-               pid_t pid;
-
-               pid = kernel_thread(kswapd, pgdat, CLONE_KERNEL);
-               BUG_ON(pid < 0);
-               read_lock(&tasklist_lock);
-               pgdat->kswapd = find_task_by_pid(pid);
-               read_unlock(&tasklist_lock);
-       }
+       for_each_online_node(nid)
+               kswapd_run(nid);
        hotcpu_notifier(cpu_callback, 0);
        return 0;
 }