From: "Paul E. McKenney" <paulmck@us.ibm.com>
To: Ingo Molnar <mingo@elte.hu>
Cc: Lee Revell <rlrevell@joe-job.com>,
linux-kernel@vger.kernel.org, dipankar@in.ibm.com,
rusty@au1.ibm.com, bmark@us.ibm.com,
Thomas Gleixner <tglx@linutronix.de>,
Andrew Morton <akpm@osdl.org>
Subject: Re: [RFC,PATCH] Use RCU to protect tasklist for unicast signals
Date: Fri, 12 Aug 2005 13:57:44 -0700 [thread overview]
Message-ID: <20050812205744.GE1297@us.ibm.com> (raw)
In-Reply-To: <20050812063600.GC13397@elte.hu>
On Fri, Aug 12, 2005 at 08:36:00AM +0200, Ingo Molnar wrote:
>
> * Lee Revell <rlrevell@joe-job.com> wrote:
>
> > Doesn't this fix the longest latency we were seeing with
> > PREEMPT_DESKTOP, I don't have a trace handy but the upshot was "signal
> > delivery must remain atomic on !PREEMPT_RT"?
>
> yes - although Paul's patch converts only a portion of the signal code
> to RCU-read-lock, so i'd expect there to be other latencies too. Might
> be worth a test (once we've sorted out the HRT build bugs).
And there remains the question of how much of the benefit remains after
I handle the corner cases... :-/
Thanx, Paul
next prev parent reply other threads:[~2005-08-12 20:57 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-08-10 17:11 [RFC,PATCH] Use RCU to protect tasklist for unicast signals Paul E. McKenney
2005-08-11 9:56 ` Ingo Molnar
2005-08-11 14:14 ` Paul E. McKenney
2005-08-12 2:00 ` Lee Revell
2005-08-12 6:36 ` Ingo Molnar
2005-08-12 20:57 ` Paul E. McKenney [this message]
2005-08-11 17:14 ` Christoph Hellwig
2005-08-11 17:56 ` Paul E. McKenney
2005-08-11 18:00 ` Dipankar Sarma
2005-08-11 18:12 ` Dipankar Sarma
-- strict thread matches above, loose matches on Subject: below --
2005-08-11 12:16 Oleg Nesterov
2005-08-11 15:20 ` Paul E. McKenney
2005-08-12 1:56 ` Paul E. McKenney
2005-08-12 8:51 ` Oleg Nesterov
2005-08-12 15:42 ` Paul E. McKenney
2005-08-15 17:44 ` Paul E. McKenney
2005-08-16 8:14 ` Ingo Molnar
2005-08-16 11:56 ` Oleg Nesterov
2005-08-16 17:07 ` Paul E. McKenney
2005-08-17 1:48 ` Paul E. McKenney
2005-08-17 6:35 ` Ingo Molnar
2005-08-17 14:35 ` Oleg Nesterov
2005-08-17 21:19 ` Paul E. McKenney
2005-08-18 11:48 ` Oleg Nesterov
2005-08-19 1:29 ` Paul E. McKenney
2005-08-19 13:27 ` Oleg Nesterov
2005-08-19 18:34 ` Paul E. McKenney
2005-08-18 12:24 ` Oleg Nesterov
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