linux-kernel - Re: [RFC v2 0/2] swait: add idle to make idle-hacks on kthreads explicit

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Message-Id: <20170615234336.GL3721@linux.vnet.ibm.com>
Date:   Thu, 15 Jun 2017 16:43:36 -0700
From:   "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:     "Luis R. Rodriguez" <mcgrof@...nel.org>
Cc:     peterz@...radead.org, oleg@...hat.com, josh@...htriplett.org,
        rostedt@...dmis.org, mathieu.desnoyers@...icios.com,
        jiangshanlai@...il.com, paul.gortmaker@...driver.com,
        ebiederm@...ssion.com, dmitry.torokhov@...il.com,
        linux-kernel@...r.kernel.org
Subject: Re: [RFC v2 0/2] swait: add idle to make idle-hacks on kthreads
 explicit

On Fri, Jun 16, 2017 at 01:26:19AM +0200, Luis R. Rodriguez wrote:
> On Thu, Jun 15, 2017 at 02:57:17PM -0700, Paul E. McKenney wrote:
> > On Thu, Jun 15, 2017 at 11:48:18AM -0700, Luis R. Rodriguez wrote:
> > > While reviewing RCU's interruptible swaits I noticed signals were actually
> > > not expected. Paul explained that the reason signals are not expected is
> > > we use kthreads, which don't get signals, furthermore the code avoided the
> > > uninterruptible swaits as otherwise it would contribute to the system load
> > > average on idle, bumping it from 0 to 2 or 3 (depending on preemption).
> > > 
> > > Since this can be confusing its best to be explicit about the requirements and
> > > goals. This patch depends on the other killable swaits [0] recently proposed as
> > > well interms of context. Thee patch can however be tested independently if
> > > the hunk is addressed separately.
> > > 
> > > [0] https://lkml.kernel.org/r/20170614222017.14653-3-mcgrof@kernel.org
> > 
> > Tested-by: Paul E. McKenney <paulmck@...ux.vnet.ibm.com>
> > 
> > Are you looking to push these or were you wanting me to?
> 
> I'd be happy for you to take them.

OK, let's see if we can get some Acked-by's or Reviewed-by's from the
relevant people.

For but one example, Eric, does this look good to you or are adjustments
needed?

							Thanx, Paul