Messages in this thread | | | Date | Thu, 03 Feb 2005 19:10:39 +0900 (JST) | Subject | Re: [Fastboot] [PATCH] Reserving backup region for kexec based crashdumps. | From | Hirokazu Takahashi <> |
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Hi Eric,
> > 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? > > > > I guess this approach has some good points. > > > > 1.Preallocating reserved area is not mandatory at boot time. > > And the reserved area can be distributed in small pieces > > like original kexec does. > > > > 2.Special linking is not required for kdump kernel. > > Each kdump kernel can be linked in the same way, > > where the original kernel exists. > > > > Am I missing something? > > Preallocating the reserved area is largely to keep it from > being the target of DMA accesses. Since we are not able > to shutdown any of the drivers in the primary kernel running > in a normal swath of memory sounds like a good way to get > yourself stomped at the worst possible time.
So what do you think my another idea?
I think we can always make a kdump kernel mapped to the same virtual address. So we will be free from caring about the physical address where the kdump kernel is loaded.
I believe the memsection functionality which LHMS project is working on would help this.
+ | | (user space) | | physical | virtual memory | space + ------------ + | | | | | | + ------------.+ original | . | map kdump kernel here kernel | . | | . | | . .+ + . . | | . . | + . | 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/
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