Messages in this thread | | | Date | Thu, 03 Feb 2005 18:37:47 +0900 (JST) | Subject | Re: [Fastboot] [PATCH] Reserving backup region for kexec based crashdumps. | From | Hirokazu Takahashi <> |
| |
Hi Vivek,
> > Hi Vivek and Eric, > > > > IMHO, why don't we swap not only the contents of the top 640K > > but also kernel working memory for kdump kernel? > > > Initial patches of kdump had adopted the same approach but given the > fact devices are not stopped during transition to new kernel after a > panic, it carried inherent risk of some DMA going on and corrupting the > new kernel/data structures. Hence the idea of running the kernel from a > reserved location came up. This should be DMA safe as long as DMA is not > misdirected.
I see, that makes sense. But I'm not sure yet that it's safe to access the top of 640MB. I wonder how kmalloc(GFP_DMA) works in a kdump kernel.
Thanks, Hirokazu Takahashi. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
| |