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authorSebastian Andrzej Siewior <bigeasy@linutronix.de>2016-11-03 15:50:00 +0100
committerThomas Gleixner <tglx@linutronix.de>2016-11-09 23:45:26 +0100
commit5588f5afb4cfc33eb377b751ba4b97184373e8d6 (patch)
treede2211c3767a7a8886f3f5d65526dc3d8a1da90e /lib/percpu_counter.c
parent308167fcb330296fc80505a6b11ba0661f38a4cc (diff)
downloadop-kernel-dev-5588f5afb4cfc33eb377b751ba4b97184373e8d6.zip
op-kernel-dev-5588f5afb4cfc33eb377b751ba4b97184373e8d6.tar.gz
lib/percpu_counter: Convert to hotplug state machine
Install the callbacks via the state machine and let the core invoke the callbacks on the already online CPUs. Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: rt@linutronix.de Link: http://lkml.kernel.org/r/20161103145021.28528-5-bigeasy@linutronix.de Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'lib/percpu_counter.c')
-rw-r--r--lib/percpu_counter.c25
1 files changed, 14 insertions, 11 deletions
diff --git a/lib/percpu_counter.c b/lib/percpu_counter.c
index 72d3611..c8cebb1 100644
--- a/lib/percpu_counter.c
+++ b/lib/percpu_counter.c
@@ -158,25 +158,21 @@ EXPORT_SYMBOL(percpu_counter_destroy);
int percpu_counter_batch __read_mostly = 32;
EXPORT_SYMBOL(percpu_counter_batch);
-static void compute_batch_value(void)
+static int compute_batch_value(unsigned int cpu)
{
int nr = num_online_cpus();
percpu_counter_batch = max(32, nr*2);
+ return 0;
}
-static int percpu_counter_hotcpu_callback(struct notifier_block *nb,
- unsigned long action, void *hcpu)
+static int percpu_counter_cpu_dead(unsigned int cpu)
{
#ifdef CONFIG_HOTPLUG_CPU
- unsigned int cpu;
struct percpu_counter *fbc;
- compute_batch_value();
- if (action != CPU_DEAD && action != CPU_DEAD_FROZEN)
- return NOTIFY_OK;
+ compute_batch_value(cpu);
- cpu = (unsigned long)hcpu;
spin_lock_irq(&percpu_counters_lock);
list_for_each_entry(fbc, &percpu_counters, list) {
s32 *pcount;
@@ -190,7 +186,7 @@ static int percpu_counter_hotcpu_callback(struct notifier_block *nb,
}
spin_unlock_irq(&percpu_counters_lock);
#endif
- return NOTIFY_OK;
+ return 0;
}
/*
@@ -222,8 +218,15 @@ EXPORT_SYMBOL(__percpu_counter_compare);
static int __init percpu_counter_startup(void)
{
- compute_batch_value();
- hotcpu_notifier(percpu_counter_hotcpu_callback, 0);
+ int ret;
+
+ ret = cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, "lib/percpu_cnt:online",
+ compute_batch_value, NULL);
+ WARN_ON(ret < 0);
+ ret = cpuhp_setup_state_nocalls(CPUHP_PERCPU_CNT_DEAD,
+ "lib/percpu_cnt:dead", NULL,
+ percpu_counter_cpu_dead);
+ WARN_ON(ret < 0);
return 0;
}
module_init(percpu_counter_startup);
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