hey Hellwig:
        cond_resched_lock is a good choice. i mixed the cond_resched_lock and 
batch to balance of
realtime and performance and resubmit this patch.

On 2016/10/16 0:55, Christoph Hellwig wrote:
On Sat, Oct 15, 2016 at 10:12:48PM +0800, zhouxianr...@huawei.com wrote:
From: z00281421 <z00281...@notesmail.huawei.com>

i think no need to place __free_vmap_area loop in purge_lock;
_free_vmap_area could be non-atomic operations with flushing tlb
but must be done after flush tlb. and the whole__free_vmap_area loops
also could be non-atomic operations. if so we could improve realtime
because the loop times sometimes is larg and spend a few time.

Right, see the previous patch in reply to Joel that drops purge_lock

Instead of your open coded batch counter you probably want to add
a cond_resched_lock after the call to __free_vmap_area.


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