On 8/14/2013 12:57 PM, Tejun Heo wrote:
> Hello, Chris.
>
> On Wed, Aug 14, 2013 at 12:03:39PM -0400, Chris Metcalf wrote:
>> Tejun, I don't know if you have a better idea for how to mark a
>> work_struct as being "not used" so we can set and test it here.
>> Is setting entry.next to NULL good? Should we offer it as an API
>> in the workqueue header?
> Maybe simply defining a static cpumask would be cleaner?
I think you're right, actually. Andrew, Tejun, how does this look?
static DEFINE_PER_CPU(struct work_struct, lru_add_drain_work);
void lru_add_drain_all(void)
{
static DEFINE_MUTEX(lock);
static struct cpumask has_work;
int cpu;
mutex_lock(&lock);
get_online_cpus();
cpumask_clear(&has_work);
for_each_online_cpu(cpu) {
struct work_struct *work = &per_cpu(lru_add_drain_work, cpu);
if (pagevec_count(&per_cpu(lru_add_pvec, cpu)) ||
pagevec_count(&per_cpu(lru_rotate_pvecs, cpu)) ||
pagevec_count(&per_cpu(lru_deactivate_pvecs, cpu)) ||
need_activate_page_drain(cpu)) {
INIT_WORK(work, lru_add_drain_per_cpu);
schedule_work_on(cpu, work);
cpumask_set_cpu(cpu, &has_work);
}
}
for_each_cpu(cpu, &has_work)
flush_work(&per_cpu(lru_add_drain_work, cpu));
put_online_cpus();
mutex_unlock(&lock);
}
--
Chris Metcalf, Tilera Corp.
http://www.tilera.com
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