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Date: Fri, 22 May 2020 00:06:46 +0800 From: Muchun Song <songmuchun@...edance.com> To: Matthew Wilcox <willy@...radead.org> Cc: adobriyan@...il.com, ast@...nel.org, daniel@...earbox.net, kafai@...com, songliubraving@...com, yhs@...com, andriin@...com, john.fastabend@...il.com, kpsingh@...omium.org, ebiederm@...ssion.com, bernd.edlinger@...mail.de, linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org, netdev@...r.kernel.org, bpf@...r.kernel.org Subject: Re: [External] Re: [PATCH] files: Use rcu lock to get the file structures for better performance On Thu, May 21, 2020 at 11:21 PM Matthew Wilcox <willy@...radead.org> 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
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