Messages in this thread | | | Subject | Re: [RFC] Hugetlb demotion for x86 | From | Adam Litke <> | Date | Thu, 11 May 2006 11:10:58 -0500 |
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On Wed, 2006-05-10 at 16:42 -0700, Christoph Lameter wrote: > Seems that the code is not modifying x86 code but all code.
Right. It's definitely broken in that regard. I sent it out in this condition so the patch was small, easy to review, and my approach would be easy to see.
> An app should be getting an out of memory error and not a SIGBUS when > running out of memory. > > I thought we fixed the SIGBUS problems and were now reporting out of > memory? If there still is an issue then we better fix out of memory > handling. Provide a way for the app to trap OOM conditions?
Yes, the SIGBUS issues are "fixed". Now the application is killed directly via VM_FAULT_OOM so it is not possible to handle the fault from userspace. For my libhugetlbfs-based fallback approach, I needed to patch the kernel so that SIGBUS was delivered to the process like in the days of old.
-- Adam Litke - (agl at us.ibm.com) IBM Linux Technology Center
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