On 07/30/2013 04:37 AM, Vijay Kilari wrote: > On Fri, Jul 26, 2013 at 10:38 PM, Stephen Warren <swarren at wwwdotorg.org> wrote: ... >> Does a kernel that's used as the crash kernel guarantee: >> >> * Never to re-use the memory that was used by the previous kernel, so >> that the spin loop code/data won't be corrupted, ever, no matter how >> long the crash recovery kernel runs. >> >> * Not use SMP, so there's never a need to re-activate the non-boot CPUs, >> which might not work if they aren't truly disabled but rather just >> running a pin loop? > > From cat /proc/iomem, normal kernel is executed from (0x80xxxxxx) with crash > kernel reserved 64M at 0xa0000000 > > 80000000-bfffffff : System RAM > 80008000-805aeddf : Kernel code > 805e2000-8063e427 : Kernel data > a0000000-a3ffffff : Crash kernel > > crash kernel is loaded to reserved memory location and is executed from there. > I could confirm this from /proc/iomem when crash kernel is running > > a0000000-a3efffff : System RAM > a0008000-a05aeddf : Kernel code > a05e2000-a063e427 : Kernel data OK, but in the crash dump kernel, is 80008000..8063e427 reserved as well, which would guarantee that the spin loop being executed by the non-crash CPUs won't be corrupted?