Re: [PATCH RFC 3/6] kexec: export PG_offline to VMCOREINFO

On Thu, Nov 15, 2018 at 02:19:23PM +0800, Dave Young wrote:

It would be good to copy some background info from cover letter to the
patch description so that we can get better understanding why this is
needed now.

BTW, Lianbo is working on a documentation of the vmcoreinfo exported
fields. Ccing him so that he is aware of this.

Also cc Boris,  although I do not want the doc changes blocks this
he might have different opinion :)

Yeah, my initial reaction is that exporting an mm-internal flag to
userspace is a no-no.

What would be better, IMHO, is having a general method of telling the
kdump kernel - maybe ranges of physical addresses - which to skip.

Because the moment there's a set of pages which do not have PG_offline
set but kdump would still like to skip, this breaks.

But that's mm guys' call.

-- 
Regards/Gruss,
    Boris.

Good mailing practices for 400: avoid top-posting and trim the reply.