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mm/vmscan: Convert to hotplug state machine 

Install the callbacks via the state machine.

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-mm@kvack.org
Cc: rt@linutronix.de
Link: http://lkml.kernel.org/r/20161103145021.28528-8-bigeasy@linutronix.de
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Sebastian Andrzej Siewior 2016-11-03 15:50:03 +01:00 committed by Thomas Gleixner
parent 005fd4bbef
commit 517bbed906
1 changed files with 14 additions and 14 deletions
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28
mm/vmscan.c
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@ -3556,24 +3556,21 @@ unsigned long shrink_all_memory(unsigned long nr_to_reclaim)
not required for correctness. So if the last cpu in a node goes not required for correctness. So if the last cpu in a node goes
away, we get changed to run anywhere: as the first one comes back, away, we get changed to run anywhere: as the first one comes back,
restore their cpu bindings. */ restore their cpu bindings. */
static int cpu_callback(struct notifier_block *nfb, unsigned long action, static int kswapd_cpu_online(unsigned int cpu)
void *hcpu)
{ {
int nid; int nid;
if (action == CPU_ONLINE || action == CPU_ONLINE_FROZEN) { for_each_node_state(nid, N_MEMORY) {
for_each_node_state(nid, N_MEMORY) { pg_data_t *pgdat = NODE_DATA(nid);
pg_data_t *pgdat = NODE_DATA(nid); const struct cpumask *mask;
const struct cpumask *mask;
mask = cpumask_of_node(pgdat->node_id); mask = cpumask_of_node(pgdat->node_id);
if (cpumask_any_and(cpu_online_mask, mask) < nr_cpu_ids) if (cpumask_any_and(cpu_online_mask, mask) < nr_cpu_ids)
/* One of our CPUs online: restore mask */ /* One of our CPUs online: restore mask */
set_cpus_allowed_ptr(pgdat->kswapd, mask); set_cpus_allowed_ptr(pgdat->kswapd, mask);
}
} }
return NOTIFY_OK; return 0;
} }
/* /*
@ -3615,12 +3612,15 @@ void kswapd_stop(int nid)
static int __init kswapd_init(void) static int __init kswapd_init(void)
{ {
int nid; int nid, ret;
swap_setup(); swap_setup();
for_each_node_state(nid, N_MEMORY) for_each_node_state(nid, N_MEMORY)
kswapd_run(nid); kswapd_run(nid);
hotcpu_notifier(cpu_callback, 0); ret = cpuhp_setup_state_nocalls(CPUHP_AP_ONLINE_DYN,
"mm/vmscan:online", kswapd_cpu_online,
NULL);
WARN_ON(ret < 0);
return 0; return 0;
} }