lkml.org 
[lkml]   [2019]   [Apr]   [25]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH] arm64: configurable sparsemem section size
On Tue 23-04-19 16:38:43, Pavel Tatashin wrote:
> sparsemem section size determines the maximum size and alignment that
> is allowed to offline/online memory block. The bigger the size the less
> the clutter in /sys/devices/system/memory/*. On the other hand, however,
> there is less flexability in what granules of memory can be added and
> removed.
>
> Recently, it was enabled in Linux to hotadd persistent memory that
> can be either real NV device, or reserved from regular System RAM
> and has identity of devdax.
>
> The problem is that because ARM64's section size is 1G, and devdax must
> have 2M label section, the first 1G is always missed when device is
> attached, because it is not 1G aligned.
>
> Allow, better flexibility by making section size configurable.

Is there any inherent reason (64k page size?) that enforces such a large
memsection?
--
Michal Hocko
SUSE Labs

\
 
 \ /
  Last update: 2019-04-25 17:26    [W:0.089 / U:0.012 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site