Messages in this thread | | | Date | Fri, 2 Nov 2007 16:36:43 +0100 | From | Ingo Molnar <> | Subject | Re: 2.6.23 regression: accessing invalid mmap'ed memory from gdb causes unkillable spinning |
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* Nick Piggin <npiggin@suse.de> wrote:
> > This means that even if some cpu is stuck in a spinlock loop with > > interrupts disabled, you'd see it with this thing. The way it works > > is that cross cpu vectored interrupts are disabled independently of > > the processor interrupt level on sparc64. > > That's really sweet. I'd better put my code where my mouth is as > well... this patch seems to be about the best we can do as a generic > fallback without getting a dedicated vector (which has to be done in > arch code anyway).
btw., in -rt we had something like this implemented as an NMI mechanism (for x86) - that way it's guaranteed that we get some output even from locked up CPUs.
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