linux-kernel - Re: [PATCH v2 09/16] rcu/tree: Maintain separate array for vmalloc ptrs

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Message-ID: <20200618213427.GV2723@paulmck-ThinkPad-P72>
Date:   Thu, 18 Jun 2020 14:34:27 -0700
From:   "Paul E. McKenney" <paulmck@...nel.org>
To:     Uladzislau Rezki <urezki@...il.com>
Cc:     Matthew Wilcox <willy@...radead.org>,
        LKML <linux-kernel@...r.kernel.org>, linux-mm@...ck.org,
        Andrew Morton <akpm@...ux-foundation.org>,
        "Theodore Y . Ts'o" <tytso@....edu>,
        Joel Fernandes <joel@...lfernandes.org>,
        RCU <rcu@...r.kernel.org>,
        Oleksiy Avramchenko <oleksiy.avramchenko@...ymobile.com>
Subject: Re: [PATCH v2 09/16] rcu/tree: Maintain separate array for vmalloc
 ptrs

On Thu, Jun 18, 2020 at 11:17:09PM +0200, Uladzislau Rezki wrote:
> > > <snip>
> > >     trace_rcu_invoke_kfree_bulk_callback(
> > >         rcu_state.name, bkvhead[i]->nr_records,
> > >             bkvhead[i]->records);
> > >     if (i == 0)
> > >         kfree_bulk(bkvhead[i]->nr_records,
> > >             bkvhead[i]->records);
> > >     else
> > >         vfree_bulk(bkvhead[i]->nr_records,
> > >             bkvhead[i]->records);
> > > <snip>
> > > 
> > > Matthew, what is your thought?
> > 
> > That was my thinking too.  If we had a kvfree_bulk(), I would expect it to
> > handle a mixture of vfree and kfree, but you've segregated them already.
> > So I think this is better.
> >
> Yes, the segregation is done. Having vfree_bulk() is enough then.
> We are on the same page :)

Very good.  When does kfree_rcu() and friends move out of kernel/rcu?

							Thanx, Paul