diff options
Diffstat (limited to 'arch/s390/kernel/topology.c')
| -rw-r--r-- | arch/s390/kernel/topology.c | 34 |
1 files changed, 26 insertions, 8 deletions
diff --git a/arch/s390/kernel/topology.c b/arch/s390/kernel/topology.c index 2abad3014928..e06fb852d386 100644 --- a/arch/s390/kernel/topology.c +++ b/arch/s390/kernel/topology.c @@ -31,7 +31,6 @@ struct mask_info { static int topology_enabled = 1; static void topology_work_fn(struct work_struct *work); static struct sysinfo_15_1_x *tl_info; -static struct timer_list topology_timer; static void set_topology_timer(void); static DECLARE_WORK(topology_work, topology_work_fn); /* topology_lock protects the core linked list */ @@ -297,12 +296,30 @@ static void topology_timer_fn(unsigned long ignored) set_topology_timer(); } +static struct timer_list topology_timer = + TIMER_DEFERRED_INITIALIZER(topology_timer_fn, 0, 0); + +static atomic_t topology_poll = ATOMIC_INIT(0); + static void set_topology_timer(void) { - topology_timer.function = topology_timer_fn; - topology_timer.data = 0; - topology_timer.expires = jiffies + 60 * HZ; - add_timer(&topology_timer); + if (atomic_add_unless(&topology_poll, -1, 0)) + mod_timer(&topology_timer, jiffies + HZ / 10); + else + mod_timer(&topology_timer, jiffies + HZ * 60); +} + +void topology_expect_change(void) +{ + if (!MACHINE_HAS_TOPOLOGY) + return; + /* This is racy, but it doesn't matter since it is just a heuristic. + * Worst case is that we poll in a higher frequency for a bit longer. + */ + if (atomic_read(&topology_poll) > 60) + return; + atomic_add(60, &topology_poll); + set_topology_timer(); } static int __init early_parse_topology(char *p) @@ -379,8 +396,10 @@ static ssize_t dispatching_store(struct sysdev_class *dev, if (cpu_management == val) goto out; rc = topology_set_cpu_management(val); - if (!rc) - cpu_management = val; + if (rc) + goto out; + cpu_management = val; + topology_expect_change(); out: mutex_unlock(&smp_cpu_state_mutex); put_online_cpus(); @@ -438,7 +457,6 @@ static int __init topology_init(void) topology_update_polarization_simple(); goto out; } - init_timer_deferrable(&topology_timer); set_topology_timer(); out: update_cpu_core_map(); |
