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SubjectRE: [PATCH 0/1] Drivers: hv: hv_balloon: do not online pages in offline blocks
Date


> -----Original Message-----
> From: Vitaly Kuznetsov [mailto:vkuznets@redhat.com]
> Sent: Wednesday, March 25, 2015 11:02 AM
> To: KY Srinivasan
> Cc: Haiyang Zhang; devel@linuxdriverproject.org; linux-
> kernel@vger.kernel.org; Dexuan Cui
> Subject: [PATCH 0/1] Drivers: hv: hv_balloon: do not online pages in offline
> blocks
>
> Patch 1/1 is rather a hackaround. The root cause of the issue is the fact that
> we're adding not fully backed memory blocks and allow to online them. It is
> relatively easy to forbid that and add only fully backed 128Mb regions. The
> whole
> driver code will be much simpler: hv_bring_pgs_online() and
> hv_online_page()
> will go away, ha_region_mutex won't probably be required,... Please let me
> know
> if you think I should follow this way.

Vitaly,

The main issue I had to address here was that Windows has a 2M alignment for memory
hot add while Linux has a 128M alignment requirement. Furthermore, we will also have to deal with
the case where only a partial 128MB block might be hot-added. The strategy I chose of selectively
onlining pages in a properly aligned block that would be hot added was to address the above two issues.

Regards,

K. Y
>
> Vitaly Kuznetsov (1):
> Drivers: hv: hv_balloon: do not online pages in offline blocks
>
> drivers/hv/hv_balloon.c | 12 +++++++++++-
> 1 file changed, 11 insertions(+), 1 deletion(-)
>
> --
> 1.9.3



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