linux-kernel - Re: [PATCH 1/2] rcu/kvfree: Carefully reset number of objects in krcp

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Date:   Thu, 15 Dec 2022 13:33:49 -0800
From:   "Paul E. McKenney" <paulmck@...nel.org>
To:     Uladzislau Rezki <urezki@...il.com>
Cc:     LKML <linux-kernel@...r.kernel.org>, RCU <rcu@...r.kernel.org>,
        Frederic Weisbecker <frederic@...nel.org>,
        Neeraj Upadhyay <neeraj.iitr10@...il.com>,
        Joel Fernandes <joel@...lfernandes.org>,
        Oleksiy Avramchenko <oleksiy.avramchenko@...y.com>
Subject: Re: [PATCH 1/2] rcu/kvfree: Carefully reset number of objects in krcp

On Thu, Dec 15, 2022 at 10:16:15PM +0100, Uladzislau Rezki wrote:
> On Thu, Dec 15, 2022 at 12:40:22PM -0800, Paul E. McKenney wrote:
> > On Wed, Dec 14, 2022 at 01:06:29PM +0100, Uladzislau Rezki (Sony) wrote:
> > > Problem. A schedule_delayed_monitor_work() relays on the
> > > number of pointers queued into krcp. Based on that number
> > > and threshold the work is rearmed with different delayed
> > > intervals, i.e. sooner or later.
> > > 
> > > There are three pipes where pointers can be placed. When
> > > any pipe is offloaded the krcp->count counter is set to
> > > zero - what is wrong. Because another pipes might not be
> > > empty.
> > > 
> > > Fix it by maintaining a counter individually per a pipe.
> > > In order to get a number of objects per a krcp introduce
> > > a krc_count() helper.
> > > 
> > > Signed-off-by: Uladzislau Rezki (Sony) <urezki@...il.com>
> > 
> > Queued and pushed for further review and testing, and with the usual
> > wordsmithing.  Much better use of workqueue handlers, thank you!!!
> > 
> <snip>
>    This commit therefore maintains per-pipe counters, and introduces a a
>    krc_count() helper to access the aggregate value of those
>    counters.
> <snip>
> 
> a a ? :)

Good eyes!  I will fix on my next rebase.

							Thanx, Paul