Re: [PATCH] perf: fix kernel panic when parsing user space CS saved in pt_regs

[Peter Zijlstra]

On Thu, Jun 05, 2014 at 09:15:36PM +0800, Zhang, Yanmin wrote:

> Sorry for misleading you. It depends on backend. Pstore can use RAM or
> other storage, for example, EFI-provided backend. If using EFI backend,
> pstore can keep persistent across cold reset or even power outrages.
> 
> If using RAM, usually pstore can keep persistent at WarmReset. Since RAM
> access (even at non-cache mode) is fast and more flexible, in fact, we often use
> RAM as backend of pstore.

Funny definition of persistent you end up with in that case... :-) But
yes, that does explain.

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