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

From: Yang Shi
Date: Sat Mar 24 2018 - 20:33:25 EST




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