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Date: Mon, 26 Jul 2004 10:23:30 +0200
From: Ingo Molnar <mingo@elte.hu>
To: Lee Revell <rlrevell@joe-job.com>
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>
Subject: Re: preempt-timing-2.6.8-rc1
Message-ID: <20040726082330.GA22764@elte.hu>
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* 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.

	Ingo