linux-kernel - Re: [RESEND PATCH v7 7/8] kernfs: Replace per-fs rwsem with hashed rwsems.

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Message-ID: <Yjir/d5S3J1PTiux@slm.duckdns.org>
Date:   Mon, 21 Mar 2022 06:46:53 -1000
From:   Tejun Heo <tj@...nel.org>
To:     Al Viro <viro@...iv.linux.org.uk>
Cc:     Imran Khan <imran.f.khan@...cle.com>, gregkh@...uxfoundation.org,
        akpm@...ux-foundation.org, linux-kernel@...r.kernel.org
Subject: Re: [RESEND PATCH v7 7/8] kernfs: Replace per-fs rwsem with hashed
 rwsems.

On Mon, Mar 21, 2022 at 07:29:45AM +0000, Al Viro wrote:
...
> stabilizing the tree topology.  Turn it into rwlock if you wish,
> with that thing being a reader and existing users - writers.
> And don't bother with further scaling, until and unless you see a real
> contention on it.

Given how rare these renames are, in the (unlikely) case the rename rwsem
becomes a problem, we should probably just switch it to a percpu_rwsem.

Thanks.

-- 
tejun