[lttng-dev] Progress on system crash traces with LTTng using DAX and pmem

Kirill A. Shutemov kirill at shutemov.name
Tue Oct 28 06:54:58 EDT 2014

On Sat, Oct 25, 2014 at 12:51:25PM +0000, Mathieu Desnoyers wrote:
> FYI, the main reason why my customer wants to go with a
> "trace into memory that survives soft reboot" approach
> rather than to use things like kexec/kdump is that they
> care about the amount of time it takes to reboot their
> machines. They want a solution where they can extract the
> detailed crash data after reboot, after the machine is
> back online, rather than requiring a few minutes of offline
> time to extract the crash details.

IIRC, on x86 there's no guarantee that your memory content will be
preserved over reboot. BIOS is free to mess with it.

 Kirill A. Shutemov

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