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Date:   Fri, 1 May 2020 14:49:35 -0400
From:   "J. Bruce Fields" <>
To:     Tejun Heo <>
Cc:     Linus Torvalds <>,
        "open list:NFS, SUNRPC, AND..." <>,
        Jeff Layton <>,
        David Howells <>, Shaohua Li <>,
        Oleg Nesterov <>,
        Linux Kernel Mailing List <>
Subject: Re: [PATCH 0/4] allow multiple kthreadd's

On Fri, May 01, 2020 at 02:21:54PM -0400, Tejun Heo wrote:
> Hello,
> On Fri, May 01, 2020 at 10:59:24AM -0700, Linus Torvalds wrote:
> > Which kind of makes me want to point a finger at Tejun. But it's been
> > mostly PeterZ touching this file lately..
> Looks fine to me too. I don't quite understand the usecase tho. It looks
> like all it's being used for is to tag some kthreads as belonging to the
> same group.

Pretty much.

> Can't that be done with kthread_data()?

Huh, maybe so, thanks.

I need to check this from generic file locking code that could be run by
any task--but I assume there's an easy way I can check if I'm a kthread
before calling  kthread_data(current).

I do expect to expose a delegation interface for userspace servers
eventually too.  But we could do the tgid check for them and still use
kthread_data() for nfsd.  That might work.


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