Re: [PATCH] mm: introduce arg_lock to protect arg_start|end and env_start|end in mm_struct

[Yang Shi]

On 3/23/18 9:30 PM, Matthew Wilcox wrote:
> > So, introduce a new rwlock in mm_struct to protect the concurrent access
> > to arg_start|end and env_start|end.
> I don't think an rwlock makes much sense here.  There is almost no
> concurrency on the read side, and an rwlock is more expensive than
> a spinlock.  Just use a spinlock.

Thanks for the comment. Yes, actually there is not concurrency on the 
read side, will change to regular spin lock.

Yang