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Date:   Fri, 22 May 2020 00:06:46 +0800
From:   Muchun Song <>
To:     Matthew Wilcox <>
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 <> 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.



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