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mm/vmstat: Convert to hotplug state machine 

Install the callbacks via the state machine, but do not invoke them as we
can initialize the node state without calling the callbacks on all online
CPUs.

start_shepherd_timer() is now called outside the get_online_cpus() block
which is safe as it only operates on cpu possible mask.

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
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Mel Gorman <mgorman@techsingularity.net>
Cc: Vlastimil Babka <vbabka@suse.cz>
Link: http://lkml.kernel.org/r/20161129145221.ffc3kg3hd7lxiwj6@linutronix.de
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Sebastian Andrzej Siewior 2016-11-29 15:52:21 +01:00 committed by Thomas Gleixner
parent 4c501327b4
commit 5438da977f
2 changed files with 36 additions and 41 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
include/linux/cpuhotplug.h
View File

@ -20,6 +20,7 @@ enum cpuhp_state {
CPUHP_VIRT_NET_DEAD,
CPUHP_SLUB_DEAD,
CPUHP_MM_WRITEBACK_DEAD,
CPUHP_MM_VMSTAT_DEAD,
CPUHP_SOFTIRQ_DEAD,
CPUHP_NET_MVNETA_DEAD,
CPUHP_CPUIDLE_DEAD,

76
mm/vmstat.c
View File

@ -1728,64 +1728,58 @@ static void __init init_cpu_node_state(void)
}
}
static void vmstat_cpu_dead(int node)
static int vmstat_cpu_online(unsigned int cpu)
{
refresh_zone_stat_thresholds();
node_set_state(cpu_to_node(cpu), N_CPU);
return 0;
}
static int vmstat_cpu_down_prep(unsigned int cpu)
{
cancel_delayed_work_sync(&per_cpu(vmstat_work, cpu));
return 0;
}
static int vmstat_cpu_dead(unsigned int cpu)
{
const struct cpumask *node_cpus;
int node;
node = cpu_to_node(cpu);
refresh_zone_stat_thresholds();
node_cpus = cpumask_of_node(node);
if (cpumask_weight(node_cpus) > 0)
return;
return 0;
node_clear_state(node, N_CPU);
return 0;
}
/*
* Use the cpu notifier to insure that the thresholds are recalculated
* when necessary.
*/
static int vmstat_cpuup_callback(struct notifier_block *nfb,
unsigned long action,
void *hcpu)
{
long cpu = (long)hcpu;
switch (action) {
case CPU_ONLINE:
case CPU_ONLINE_FROZEN:
refresh_zone_stat_thresholds();
node_set_state(cpu_to_node(cpu), N_CPU);
break;
case CPU_DOWN_PREPARE:
case CPU_DOWN_PREPARE_FROZEN:
cancel_delayed_work_sync(&per_cpu(vmstat_work, cpu));
break;
case CPU_DOWN_FAILED:
case CPU_DOWN_FAILED_FROZEN:
break;
case CPU_DEAD:
case CPU_DEAD_FROZEN:
refresh_zone_stat_thresholds();
vmstat_cpu_dead(cpu_to_node(cpu));
break;
default:
break;
}
return NOTIFY_OK;
}
static struct notifier_block vmstat_notifier =
{ &vmstat_cpuup_callback, NULL, 0 };
#endif
static int __init setup_vmstat(void)
{
#ifdef CONFIG_SMP
cpu_notifier_register_begin();
__register_cpu_notifier(&vmstat_notifier);
int ret;
ret = cpuhp_setup_state_nocalls(CPUHP_MM_VMSTAT_DEAD, "mm/vmstat:dead",
NULL, vmstat_cpu_dead);
if (ret < 0)
pr_err("vmstat: failed to register 'dead' hotplug state\n");
ret = cpuhp_setup_state_nocalls(CPUHP_AP_ONLINE_DYN, "mm/vmstat:online",
vmstat_cpu_online,
vmstat_cpu_down_prep);
if (ret < 0)
pr_err("vmstat: failed to register 'online' hotplug state\n");
get_online_cpus();
init_cpu_node_state();
put_online_cpus();
start_shepherd_timer();
cpu_notifier_register_done();
#endif
#ifdef CONFIG_PROC_FS
proc_create("buddyinfo", S_IRUGO, NULL, &fragmentation_file_operations);