From: Peter Zijlstra <peterz@infradead.org>
To: David Miller <davem@davemloft.net>
Cc: eric.dumazet@gmail.com, tglx@linutronix.de, ben@decadent.org.uk,
mkl@pengutronix.de, linux-rt-users@vger.kernel.org,
linux-kernel@vger.kernel.org, netdev@vger.kernel.org,
kernel@pengutronix.de
Subject: Re: [PATCH] net: sched: dev_deactivate_many(): use msleep(1) instead of yield() to wait for outstanding qdisc_run callsb
Date: Mon, 7 Apr 2014 13:19:06 +0200 [thread overview]
Message-ID: <20140407111906.GH11096@twins.programming.kicks-ass.net> (raw)
In-Reply-To: <20140404.112628.1273328398538574058.davem@davemloft.net>
On Fri, Apr 04, 2014 at 11:26:28AM -0400, David Miller wrote:
> From: Peter Zijlstra <peterz@infradead.org>
> Date: Fri, 4 Apr 2014 17:19:42 +0200
>
> > The proper way to fix the dev_deactivate_many() is to use wait_event(),
> > polling for that state is just daft. Afaict there is no reason the qdisc
> > code could not do a wakeup whenever that condition changes.
>
> I actually looked into this, and it's going to add expensive checks
> to the fast paths of packet processing.
>
> If it was so easy we'd be doing it that way already.
Fair enough; and I suppose this waiting side is 'rare' compared to the
packet processing side of things?
In that case you could add a comment with the msleep() and just leave it
at that I suppose.
next prev parent reply other threads:[~2014-04-07 11:19 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-03-04 23:49 [PATCH] net: sched: dev_deactivate_many(): use msleep(1) instead of yield() to wait for outstanding qdisc_run calls Marc Kleine-Budde
2014-03-06 21:06 ` David Miller
2014-03-06 21:39 ` Marc Kleine-Budde
2014-03-07 15:47 ` Sebastian Andrzej Siewior
2014-03-07 4:26 ` Mike Galbraith
2014-03-09 19:09 ` Ben Hutchings
2014-03-09 22:53 ` David Miller
2014-03-09 23:17 ` Ben Hutchings
2014-03-09 23:28 ` David Lang
2014-03-10 0:07 ` Stanislav Meduna
2014-03-31 21:49 ` [PATCH] net: sched: dev_deactivate_many(): use msleep(1) instead of yield() to wait for outstanding qdisc_run callsb Thomas Gleixner
2014-04-02 11:07 ` Peter Zijlstra
2014-04-02 11:17 ` Eric Dumazet
2014-04-04 15:19 ` Peter Zijlstra
2014-04-04 15:26 ` David Miller
2014-04-07 11:19 ` Peter Zijlstra [this message]
2014-04-04 15:28 ` David Miller
2014-04-07 11:24 ` Peter Zijlstra
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