Re: [PATCH v4 5/8] vmcore: copy ELF note segments in the 2nd kernelper page vmcore objects

From: Vivek Goyal
Date: Mon Apr 29 2013 - 15:36:54 EST

On Sat, Apr 13, 2013 at 09:21:33AM +0900, HATAYAMA Daisuke wrote:

> ELF notes are per-cpu, so total size of ELF note segments increases
> according to the number of CPUs. The current maximum number of CPUs on
> x86_64 is 5192, and there's already system with 4192 CPUs in SGI,
> where total size amounts to 1MB. This can be larger in the neare
> futrue or possibly even now on another architecture. Thus, to avoid
> the case where memory allocation for large block fails, we allocate
> vmcore objects per pages.

IIRC, eric had suggested using vmalloc() and remap_vmalloc_range(). What's
wrong with that? That should keep your vc_list relatively smaller.

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