linux-kernel - Re: [PATCH v2 0/5] Allocate memmap from hotadded memory

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Message-ID: <4ddee0dd719abd50350f997b8089fa26f6004c0c.camel@gmail.com>
Date:   Thu, 01 Aug 2019 09:06:40 +1000
From:   Rashmica Gupta <rashmica.g@...il.com>
To:     Michal Hocko <mhocko@...nel.org>
Cc:     Oscar Salvador <osalvador@...e.de>,
        David Hildenbrand <david@...hat.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Dan Williams <dan.j.williams@...el.com>,
        pasha.tatashin@...een.com, Jonathan.Cameron@...wei.com,
        anshuman.khandual@....com, Vlastimil Babka <vbabka@...e.cz>,
        linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 0/5] Allocate memmap from hotadded memory

On Wed, 2019-07-31 at 14:08 +0200, Michal Hocko wrote:
> On Tue 02-07-19 18:52:01, Rashmica Gupta wrote:
> [...]
> > > 2) Why it was designed, what is the goal of the interface?
> > > 3) When it is supposed to be used?
> > > 
> > > 
> > There is a hardware debugging facility (htm) on some power chips.
> > To use
> > this you need a contiguous portion of memory for the output to be
> > dumped
> > to - and we obviously don't want this memory to be simultaneously
> > used by
> > the kernel.
> 
> How much memory are we talking about here? Just curious.

>From what I've seen a couple of GB per node, so maybe 2-10GB total.