Re: [Crash-utility] Why are there two ways of getting register values for active tasks?
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----- "Daisuke HATAYAMA" <d.hatayama(a)jp.fujitsu.com> wrote:
Hi, all.
I have a question on the implementation of get_netdump_regs_x86_64().
Currently, in order to get register values for active tasks, only
panic task makes use of note information. On the other hand, other
active tasks search stack frame for registers saved at nmi
switch. However, crash dump contains the note information for every
CPUs, so I think it uncessary to search stack frame.
Originally it was done that way because the code was written for
netdump-generated dumpfiles, which only generated note information
for the panic task. But if I'm not mistaken, given that recent
kernels do not store debuginfo data for the user_regs_struct, it
almost always falls through into x86_64_get_stack_frame().
Dave
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Dave Anderson