Re: preempt-timing-2.6.8-rc1

Lee Revell
2004-07-25T22:48:55Z

On Sun, 2004-07-25 at 01:15, Lee Revell wrote:
> On Tue, 2004-07-13 at 10:39, William Lee Irwin III wrote:
> > On Tue, Jul 13, 2004 at 05:24:32PM +0300, Lenar L?hmus wrote:
> > > What I've excluded (happens all the time):
> > > 1) 2ms non-preemptible critical section violated 1 ms preempt threshold
> > > starting at schedule+0x36/0x480 and ending at do_IRQ+0xec/0x130
> > > it's 2ms 98%. This really happens all the time. Bogus?
> >
> > Wild guess is that you took an IRQ in dec_preempt_count() and that threw
> > your results off. Let me know if the patch below helps at all. My guess
> > is it'll cause more apparent problems than it solves.
>
> I applied the patch to 2.6.8-rc2 + voluntary-preempt-I4, and am
> constantly getting these:
>

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: [dump_stack+23/32] dump_stack+0x17/0x20
Jul 25 18:46:18 mindpipe kernel: [dec_preempt_count+270/288] dec_preempt_count+0x10e/0x120
Jul 25 18:46:18 mindpipe kernel: [kunmap_atomic+8/32] kunmap_atomic+0x8/0x20
Jul 25 18:46:18 mindpipe kernel: [do_anonymous_page+139/400] do_anonymous_page+0x8b/0x190
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

Lee