linux-kernel - RE: [PATCH 1/1] rcu/rcuscale: Stop kfree_scale_thread thread(s) after unloading rcuscale

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Date:   Thu, 16 Mar 2023 13:17:10 +0000
From:   "Zhuo, Qiuxu" <qiuxu.zhuo@...el.com>
To:     "paulmck@...nel.org" <paulmck@...nel.org>,
        Joel Fernandes <joel@...lfernandes.org>
CC:     Frederic Weisbecker <frederic@...nel.org>,
        Josh Triplett <josh@...htriplett.org>,
        Neeraj Upadhyay <quic_neeraju@...cinc.com>,
        Davidlohr Bueso <dave@...olabs.net>,
        Steven Rostedt <rostedt@...dmis.org>,
        Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
        Lai Jiangshan <jiangshanlai@...il.com>,
        "rcu@...r.kernel.org" <rcu@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH 1/1] rcu/rcuscale: Stop kfree_scale_thread thread(s) after
 unloading rcuscale

> From: Paul E. McKenney <paulmck@...nel.org>
> [...]
> > >
> > > How about to pull the rcu_scale_cleanup() function after
> kfree_scale_cleanup().
> > > This groups kfree_* functions and groups rcu_scale_* functions.
> > > Then the code would look cleaner.
> > > So, do you think the changes below are better?
> >
> > IMHO, I don't think doing such a code move is better. Just add a new
> > header file and declare the function there. But see what Paul says
> > first.
> 
> This situation is likely to be an early hint that the kvfree_rcu() testing should
> be split out from kernel/rcu/rcuscale.c.

Another is that it's a bit expensive to create a new header file just for 
eliminating a function declaration. ;-)

So, if no objections, I'd like to send out the v2 patch with the updates below:

   - Move rcu_scale_cleanup() after kfree_scale_cleanup() to eliminate the
     declaration of kfree_scale_cleanup(). Though this makes the patch bigger, 
     get the file rcuscale.c much cleaner.

   - Remove the unnecessary step "modprobe torture" from the commit message.

   - Add the description for why move rcu_scale_cleanup() after
     kfree_scale_cleanup() to the commit message.

Thanks!
-Qiuxu

> [...]