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Re: is minimum udelay() not respected in preemptible SMP kernel-2.6.23?
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From:
Andi Kleen <ak@...>
To: Andrew Morton <akpm@...>
Cc: Marin Mitov <mitov@...>, <linux-kernel@...>, Thomas Gleixner <tglx@...>, Ingo Molnar <mingo@...>
Subject:
Re: is minimum udelay() not respected in preemptible SMP kernel-2.6.23?
Date: Wednesday, November 7, 2007 - 7:10 pm
> Ow. Yes, from my reading delay_tsc() can return early (or after
quoted text
> heat-death-of-the-universe) if the TSCs are offset and if preemption > migrates the calling task between CPUs. > > I suppose a lameo fix would be to disable preemption in delay_tsc().
Yes. Can't think of any better reasonable fix. -Andi -
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Messages in current thread:
is minimum udelay() not respected in preemptible SMP kernel-...
, Marin Mitov
, (Wed Nov 7, 1:21 pm)
Re: is minimum udelay() not respected in preemptible SMP ker...
, Andrew Morton
, (Wed Nov 7, 4:30 pm)
Re: is minimum udelay() not respected in preemptible SMP ker...
, Marin Mitov
, (Thu Nov 8, 7:24 am)
Re: is minimum udelay() not respected in preemptible SMP ker...
, Matt Mackall
, (Wed Nov 7, 8:20 pm)
Re: is minimum udelay() not respected in preemptible SMP ker...
, Peter Zijlstra
, (Thu Nov 8, 5:11 am)
Re: is minimum udelay() not respected in preemptible SMP ker...
, Matt Mackall
, (Thu Nov 8, 11:43 am)
Re: is minimum udelay() not respected in preemptible SMP ker...
, Andi Kleen
, (Wed Nov 7, 8:31 pm)
Re: is minimum udelay() not respected in preemptible SMP ker...
, Avi Kivity
, (Thu Nov 8, 7:46 am)
Re: is minimum udelay() not respected in preemptible SMP ker...
, Matt Mackall
, (Thu Nov 8, 11:10 am)
Re: is minimum udelay() not respected in preemptible SMP ker...
, Matt Mackall
, (Wed Nov 7, 9:03 pm)
Re: is minimum udelay() not respected in preemptible SMP ker...
, Andi Kleen
, (Wed Nov 7, 9:20 pm)
Re: is minimum udelay() not respected in preemptible SMP ker...
, Matt Mackall
, (Wed Nov 7, 10:44 pm)
Re: is minimum udelay() not respected in preemptible SMP ker...
, Andi Kleen
, (Wed Nov 7, 7:10 pm)
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