linux-kernel - Re: [PATCH v2 0/6] kernfs: proposed locking and concurrency improvement

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Message-ID: <20200624131908.GE13061@mtj.duckdns.org>
Date:   Wed, 24 Jun 2020 09:19:08 -0400
From:   Tejun Heo <tj@...nel.org>
To:     Rick Lindsley <ricklind@...ux.vnet.ibm.com>
Cc:     Ian Kent <raven@...maw.net>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Stephen Rothwell <sfr@...b.auug.org.au>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Al Viro <viro@...iv.linux.org.uk>,
        David Howells <dhowells@...hat.com>,
        Miklos Szeredi <miklos@...redi.hu>,
        linux-fsdevel <linux-fsdevel@...r.kernel.org>,
        Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 0/6] kernfs: proposed locking and concurrency
 improvement

Hello, Rick.

On Wed, Jun 24, 2020 at 02:04:15AM -0700, Rick Lindsley wrote:
> In contrast, the provided patch fixes the observed problem with no ripple
> effect to other subsystems or utilities.
> 
> Greg had suggested
>     Treat the system as a whole please, don't go for a short-term
>     fix that we all know is not solving the real problem here.
> 
> Your solution affects multiple subsystems; this one affects one.  Which is
> the whole system approach in terms of risk?  You mentioned you support 30k
> scsi disks but only because they are slow so the inefficiencies of kernfs
> don't show.  That doesn't bother you?

I suggest putting honest thoughts into finding a long term solution instead
of these rhetorical retorts. If you really can't see how ill-suited the
current use of interface and proposed solution is, I'm not sure how better
to communicate them to you.

Thanks.

-- 
tejun