On Thu, May 21, 2020 at 11:21 PM Matthew Wilcox <willy@xxxxxxxxxxxxx> wrote: > > On Thu, May 21, 2020 at 08:38:35PM +0800, Muchun Song wrote: > > There is another safe way to get the file structure without > > holding the files->file_lock. That is rcu lock, and this way > > has better performance. So use the rcu lock instead of the > > files->file_lock. > > What makes you think this is safe? Are you actually seeing contention > on this spinlock? > I have read the doc which is in the Documentation/filesystems/files.txt. If my understanding is correct, I think it is safe to use rcu lock. Thanks. -- Yours, Muchun
