linux-kernel - Re: [REPOST PATCH v4 3/5] kernfs: switch kernfs to use an rwsem

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Message-ID: <CAJfpeguSnA-At8Jca0Ge0aytC22Gb5YmKpxbEy82rR7btczh5Q@mail.gmail.com>
Date:   Tue, 1 Jun 2021 15:11:47 +0200
From:   Miklos Szeredi <miklos@...redi.hu>
To:     Ian Kent <raven@...maw.net>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Tejun Heo <tj@...nel.org>, Eric Sandeen <sandeen@...deen.net>,
        Fox Chen <foxhlchen@...il.com>,
        Brice Goglin <brice.goglin@...il.com>,
        Al Viro <viro@...iv.linux.org.uk>,
        Rick Lindsley <ricklind@...ux.vnet.ibm.com>,
        David Howells <dhowells@...hat.com>,
        Marcelo Tosatti <mtosatti@...hat.com>,
        linux-fsdevel <linux-fsdevel@...r.kernel.org>,
        Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [REPOST PATCH v4 3/5] kernfs: switch kernfs to use an rwsem

On Fri, 28 May 2021 at 08:34, Ian Kent <raven@...maw.net> wrote:
>
> The kernfs global lock restricts the ability to perform kernfs node
> lookup operations in parallel during path walks.
>
> Change the kernfs mutex to an rwsem so that, when opportunity arises,
> node searches can be done in parallel with path walk lookups.

I don't see how this could have any drawbacks.

Reviewed-by: Miklos Szeredi <mszeredi@...hat.com>