On Thu, 28 Jan 2016 16:29:57 +0100 Peter Zijlstra <[email protected]> wrote:
> On Thu, Jan 28, 2016 at 02:53:53PM +0000, Mathieu Desnoyers wrote: > > On x86, many BIOS wipe the memory content even after a warm reset :( > > The most reliable solution I found on x86 is to use kexec() to > > boot into a new kernel, mount the DAX filesystem again and read the > > buffers from there. > > kexec() is tricky when the kernel is still prefectly fine, I doubt it'll > work when I've hosed it properly :/ I use it all the time when a kernel crashes. Well, kexec and kdump. Which by the way, the crash utility has a way to read the ftrace ring buffer from a kexec kdump core file. -- Steve
