lkml.org 
[lkml]   [2020]   [Mar]   [4]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
SubjectRe: [PATCH 1/1] powerpc/kernel: Enables memory hot-remove after reboot on pseries guests
From
Date
Hello Bharata, thanks for this feedback!

On Wed, 2020-03-04 at 10:13 +0530, Bharata B Rao wrote:
> Hi,
>
> I tried this a few years back
> (https://patchwork.ozlabs.org/patch/800142/) and didn't pursue it
> further because at that time, it was felt that the approach might not
> work for PowerVM guests, because all the present memory except RMA
> gets marked as hot-pluggable by PowerVM. This discussion is not
> present in the above thread, but during my private discussions with
> Reza and Nathan, it was noted that making all that memory as MOVABLE
> is not preferable for PowerVM guests as we might run out of memory for
> kernel allocations.

Humm, this makes sense.
But with mu change, these pieces of memory only get into ZONE_MOVABLE
if the boot parameter 'movable_node' gets passed to guest kernel.

So, even if we are unable to sort out some flag combination that work
fine for both use-cases, if PowerVM don't pass 'movable_node' as boot
parameter to kernel, it will behave just as today.

What are your thoughts on that?

Best regards,

Leonardo Bras
[unhandled content-type:application/pgp-signature]
\
 
 \ /
  Last update: 2020-03-04 08:19    [W:1.724 / U:0.036 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site