From: Mike Galbraith <umgwanakikbuti@gmail.com>
To: paulmck@linux.vnet.ibm.com
Cc: Thomas Gleixner <tglx@linutronix.de>,
Calvin Owens <calvinowens@fb.com>,
Andrew Morton <akpm@linux-foundation.org>,
Joe Perches <joe@perches.com>,
Peter Zijlstra <peterz@infradead.org>,
linux-kernel@vger.kernel.org, kernel-team@fb.com
Subject: Re: [PATCH] ksoftirqd: Enable IRQs and call cond_resched() before poking RCU
Date: Wed, 21 Jan 2015 07:29:39 +0100 [thread overview]
Message-ID: <1421821779.16275.5.camel@marge.simpson.net> (raw)
In-Reply-To: <20150121051008.GX9719@linux.vnet.ibm.com>
On Tue, 2015-01-20 at 21:10 -0800, Paul E. McKenney wrote:
> On Wed, Jan 21, 2015 at 04:40:39AM +0100, Mike Galbraith wrote:
> > I've been curious about this for ages, so now is a great time to bite
> > the bullet and ask TheMan. A context switch is not far away, why do we
> > need that quiescent state badly enough to tell what looks like a little
> > white lie to get it immediately?
> >
> > (I commented it out in an -rt kernel I was testing yesterday, beat it
> > enthusiastically for a while, and box didn't _seem_ to notice that it
> > was missing anything)
>
> Yeah, you do have to have a fairly violent network-based DoS attack
> to see the difference. Robert Olsson was the first to make this happen
> back in the day.
Ah, my little NIC doesn't have enough poop to do that. Thanks.
-Mike
next prev parent reply other threads:[~2015-01-21 6:29 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-01-07 1:37 Calvin Owens
2015-01-07 1:49 ` [PATCH v2] " Calvin Owens
2015-01-07 2:19 ` Paul E. McKenney
2015-01-07 16:52 ` Paul E. McKenney
2015-01-08 4:33 ` Calvin Owens
2015-01-08 4:53 ` Paul E. McKenney
2015-01-08 21:46 ` Calvin Owens
2015-01-13 11:17 ` Thomas Gleixner
2015-01-13 18:43 ` Paul E. McKenney
2015-01-13 21:16 ` [PATCH] " Calvin Owens
2015-01-14 22:12 ` Paul E. McKenney
2015-01-20 13:21 ` Thomas Gleixner
2015-01-20 20:30 ` Paul E. McKenney
2015-01-21 3:40 ` Mike Galbraith
2015-01-21 5:10 ` Paul E. McKenney
2015-01-21 6:29 ` Mike Galbraith [this message]
2015-01-21 9:30 ` Thomas Gleixner
2015-01-21 10:27 ` Paul E. McKenney
2015-01-22 10:39 ` Thomas Gleixner
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