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Subject: Re: preempt-timing-2.6.8-rc1
From: Lee Revell <rlrevell@joe-job.com>
To: Ingo Molnar <mingo@elte.hu>
Cc: William Lee Irwin III <wli@holomorphy.com>, Lenar L?hmus <lenar@vision.ee>,
       linux-kernel <linux-kernel@vger.kernel.org>,
       Andrew Morton <akpm@osdl.org>
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Date: Mon, 26 Jul 2004 04:29:34 -0400
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On Mon, 2004-07-26 at 04:23, Ingo Molnar wrote:
> * Lee Revell <rlrevell@joe-job.com> wrote:
> 
> > Here is another one:
> > 
> > Jul 25 18:46:18 mindpipe kernel: 11ms non-preemptible critical section violated 1 ms preempt threshold starting at kmap_atomic+0x10/0x60 and ending at kunmap_atomic+0x8/0x20
> 
> > Jul 25 18:46:18 mindpipe kernel:  [do_no_page+78/784] do_no_page+0x4e/0x310
> > Jul 25 18:46:18 mindpipe kernel:  [handle_mm_fault+193/368] handle_mm_fault+0xc1/0x170
> > Jul 25 18:46:18 mindpipe kernel:  [get_user_pages+288/944] get_user_pages+0x120/0x3b0
> > Jul 25 18:46:18 mindpipe kernel:  [make_pages_present+104/144] make_pages_present+0x68/0x90
> > Jul 25 18:46:18 mindpipe kernel:  [do_mmap_pgoff+998/1568] do_mmap_pgoff+0x3e6/0x620
> > Jul 25 18:46:18 mindpipe kernel:  [sys_mmap2+118/176] sys_mmap2+0x76/0xb0
> > Jul 25 18:46:18 mindpipe kernel:  [syscall_call+7/11] syscall_call+0x7/0xb
> 
> is this an mmap(MAP_LOCKED) instance [or a process doing an mmap() after
> having done an mlockall()]? I'll take a look.
> 

Yes, jackd does exactly this, mlockall then opens the ALSA driver with
mmap.

Lee