From: Ingo Molnar <mingo@elte.hu>
To: George Anzinger <george@mvista.com>
Cc: Thomas Gleixner <tglx@linutronix.de>,
LKML <linux-kernel@vger.kernel.org>,
Doug Niehaus <niehaus@ittc.ku.edu>,
Benedikt Spranger <bene@linutronix.de>
Subject: Re: High resolution timers and BH processing on -RT
Date: Fri, 28 Jan 2005 19:51:01 +0100 [thread overview]
Message-ID: <20050128185101.GC25164@elte.hu> (raw)
In-Reply-To: <41FA85A7.4000805@mvista.com>
* George Anzinger <george@mvista.com> wrote:
> A quick comment here on the current RT code. It looks to me like
> there is a race in timer delivery. It looks like the softirq is
> "raised" by the PIT interrupt code and the jiffie is bumped by the
> timer thread. If the softirq gets to run prior to the PIT interrupt
> thread we could end up in the run_timer list code with a stale jiffie
> value and do nothing. This would delay normal timers for a jiffie and
> HRT timers for some time less than a jiffie, depending on when they
> were really due.
>
> I thing we should move the raising of the timer softirq to the PIT
> interrupt thread after we release the xtime_lock.
ok - mind sending a patch for this?
Ingo
next prev parent reply other threads:[~2005-01-28 18:51 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-01-28 0:13 High resolution timers and BH processing on -RT Thomas Gleixner
2005-01-28 4:43 ` Ingo Molnar
2005-01-28 8:20 ` Thomas Gleixner
2005-01-28 8:24 ` Ingo Molnar
2005-01-28 8:30 ` Thomas Gleixner
2005-01-28 8:47 ` Ingo Molnar
2005-01-28 18:34 ` George Anzinger
2005-01-28 18:51 ` Ingo Molnar [this message]
2005-01-28 18:53 ` Ingo Molnar
2005-01-31 9:12 ` Thomas Gleixner
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