Re: [patch] voluntary-preempt-2.6.8-rc3-O5

[Lee Revell]

On Tue, 2004-08-10 at 09:26, Ingo Molnar wrote:
> i've uploaded the latest version of the voluntary-preempt patch:
>     
>   http://redhat.com/~mingo/voluntary-preempt/voluntary-preempt-2.6.8-rc3-O5
> 
> -O5 fixes the APIC lockup issues. The bug was primarily caused by PCI
> POST delays causing IRQ storms of level-triggered IRQ sources that were
> hardirq-redirected. Also found some bugs in delayed-IRQ masking and
> unmasking. SMP should thus work again too.
> 

The mlockall() issue seems to be fixed.  Now I get this one when
starting jackd:

(jackd/12427): 10882us non-preemptible critical section violated 400 us preempt threshold starting at kernel_fpu_begin+0x10/0x60 and ending at fast_clear_page+0x75/0xa0
 [<c0106777>] dump_stack+0x17/0x20
 [<c01140eb>] sub_preempt_count+0x4b/0x60
 [<c01d1585>] fast_clear_page+0x75/0xa0
 [<c013ea86>] do_anonymous_page+0x86/0x180
 [<c013ebd0>] do_no_page+0x50/0x300
 [<c013f041>] handle_mm_fault+0xc1/0x170
 [<c013da33>] get_user_pages+0x133/0x3d0
 [<c013f198>] make_pages_present+0x68/0x90
 [<c0140948>] do_mmap_pgoff+0x3f8/0x640
 [<c010b7f6>] sys_mmap2+0x76/0xb0
 [<c0106117>] syscall_call+0x7/0xb

Lee

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