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Subject: Re: [Jackit-devel] Re: [patch] voluntary-preempt-2.6.8-rc3-O5
From: Lee Revell <rlrevell@joe-job.com>
To: Florian Schmidt <mista.tapas@gmx.net>
Cc: Ingo Molnar <mingo@elte.hu>, linux-kernel <linux-kernel@vger.kernel.org>,
       Felipe Alfaro Solana <felipe_alfaro@linuxmail.org>,
       jackit-devel <jackit-devel@lists.sourceforge.net>,
       Paul Davis <paul@linuxaudiosystems.com>
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On Thu, 2004-08-12 at 20:55, Florian Schmidt wrote:
> I think many of the jackd xruns are really jacks business. But maybe i
> misinterpret the symptom.
> 

I also get this one with apt-get dist-upgrade:

(dpkg/11902): 444us [0 jiffy] non-preemptible critical section violated
300 us preempt threshold starting at copy_mm+0x31b/0x3f0 and ending at
copy_page_range+0x144/0x290
 [<c0106497>] dump_stack+0x17/0x20
 [<c0113dc2>] touch_preempt_timing+0x32/0x40
 [<c013b7b4>] copy_page_range+0x144/0x290
 [<c0114922>] copy_mm+0x362/0x3f0
 [<c0115243>] copy_process+0x3d3/0xb60
 [<c0115a11>] do_fork+0x41/0x1b3
 [<c01049b9>] sys_clone+0x29/0x30
 [<c0105e57>] syscall_call+0x7/0xb

Shouldn't fork()'ing a dpkg process be a lot faster than that, with
copy-on-write etc?

Lee