Re: [PATCH] files: Use rcu lock to get the file structures for better performance
From: Matthew Wilcox <willy@infradead.org>
Date: 2020-05-21 15:21:39
Also in:
bpf, linux-fsdevel, lkml
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?