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

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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>
This commit is contained in:
Yasunori Goto 2006-06-27 02:53:33 -07:00 committed by Linus Torvalds
parent 10ad400b49
commit 3218ae14b1
2 changed files with 28 additions and 11 deletions
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2
include/linux/swap.h
View File

@ -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);

37
mm/vmscan.c
View File

@ -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;
}