Messages in this thread Patch in this message | | | Date | Fri, 17 Mar 2006 17:22:28 +0900 | From | Yasunori Goto <> | Subject | [PATCH: 011/017]Memory hotplug for new nodes v.4.(start kswapd) |
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When node is hot-added, kswapd for the node should start. This export kswapd start function as kswapd_run().
Signed-off-by: Yasunori Goto <y-goto@jp.fujitsu.com> Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
include/linux/swap.h | 5 +++++ mm/vmscan.c | 35 ++++++++++++++++++++++++++--------- 2 files changed, 31 insertions(+), 9 deletions(-)
Index: pgdat8/mm/vmscan.c =================================================================== --- pgdat8.orig/mm/vmscan.c 2006-03-16 16:05:38.000000000 +0900 +++ pgdat8/mm/vmscan.c 2006-03-16 16:06:27.000000000 +0900 @@ -35,6 +35,7 @@ #include <linux/notifier.h> #include <linux/rwsem.h> #include <linux/delay.h> +#include <linux/kthread.h> #include <asm/tlbflush.h> #include <asm/div64.h> @@ -1843,20 +1844,36 @@ static int __devinit cpu_callback(struct } #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 (pgdat->kswapd == ERR_PTR(-ENOMEM)) { + /* failure at boot is fatal */ + BUG_ON(system_state == SYSTEM_BOOTING); + printk("faled to run 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; + for_each_online_node(nid) + kswapd_run(nid); - 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); - } total_memory = nr_free_pagecache_pages(); hotcpu_notifier(cpu_callback, 0); return 0; Index: pgdat8/include/linux/swap.h =================================================================== --- pgdat8.orig/include/linux/swap.h 2006-03-16 16:05:38.000000000 +0900 +++ pgdat8/include/linux/swap.h 2006-03-16 16:06:27.000000000 +0900 @@ -208,6 +208,11 @@ static inline int migrate_pages(struct l #define fail_migrate_page NULL #endif +#ifdef CONFIG_MEMORY_HOTPLUG +/* start new kswapd for new node */ +extern int kswapd_run(int nid); +#endif + #ifdef CONFIG_MMU /* linux/mm/shmem.c */ extern int shmem_unuse(swp_entry_t entry, struct page *page); -- Yasunori Goto
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