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

[Michal Hocko]

On Mon 26-03-18 23:49:18, Tetsuo Handa wrote:
[...]
> Also, even if we succeeded to avoid mmap_sem contention at that location,
> won't we after all get mmap_sem contention messages a bit later, for
> access_remote_vm() holds mmap_sem which would lead to traces like above
> if mmap_sem is already contended?

Yes, but at least we get rid of the mmap_sem for something that can use
a more fine grained locking.

Maybe we can get a finer grained range locking for mmap_sem one day and
not having the full range locked section will be a plus.

-- 
Michal Hocko
SUSE Labs