From mboxrd@z Thu Jan  1 00:00:00 1970
From: Bharata B Rao <bharata-23VcF4HTsmIX0ybBhKVfKdBPR1lH4CV8@public.gmane.org>
Subject: Re: [Qemu-devel] [PATCH 19/23] userfaultfd: activate syscall
Date: Tue, 8 Sep 2015 15:30:30 +0530
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To: "Dr. David Alan Gilbert" <dgilbert-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
Cc: Michael Ellerman <mpe-Gsx/Oe8HsFggBc27wqDAHg@public.gmane.org>, Andrea Arcangeli <aarcange-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>, Andrew Morton <akpm-de/tnXTf+JLsfHDXvbKv3WD2FQJk+8+b@public.gmane.org>, linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-mm-Bw31MaZKKs3YtjvyW6yDsg@public.gmane.org, qemu-devel-qX2TKyscuCcdnm+yROfE0A@public.gmane.org, kvm-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-api-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, zhang.zhanghailiang-hv44wF8Li93QT0dZR+AlfA@public.gmane.org, Pavel Emelyanov <xemul-bzQdu9zFT3WakBO8gow8eQ@public.gmane.org>, Johannes Weiner <hannes-druUgvl0LCNAfugRpC6u6w@public.gmane.org>, Hugh Dickins <hughd-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>, Sanidhya Kashyap <sanidhya.gatech-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>, Dave Hansen <dave.hansen-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>, Andres Lagar-Cavilla <andreslc-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>, Mel Gorman <mgorman-l3A5Bk7waGM@public.gmane.org>, Paolo Bonzini <pbonzini-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>, "Kirill A. Shutemov" <kirill-oKw7cIdHH8eLwutG50LtGA@public.gmane.org>, "Huangpeng (Peter)" <peter.huangpeng-hv44wF8Li93QT0dZR+AlfA@public.gmane.org>, Andy Lutomirski <luto-kltTT9wpgjJwATOyAt5JVQ@public.gmane.org>, Linus Torvalds <torvalds-de/tnXTf+JLsfHDXvbKv3WD2FQJk+8+b@public.gmane.org>, Peter Feiner <pfeiner-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>, linuxppc-dev-uLR06cmDAlY/bJ5BZ2RsiQ@public.gmane.org
List-Id: linux-api@vger.kernel.org

On Tue, Sep 08, 2015 at 09:59:47AM +0100, Dr. David Alan Gilbert wrote:
> * Bharata B Rao (bharata-23VcF4HTsmIX0ybBhKVfKdBPR1lH4CV8@public.gmane.org) wrote:
> > In fact I had successfully done postcopy migration of sPAPR guest with
> > this setup.
> 
> Interesting - I'd not got that far myself on power; I was hitting a problem
> loading htab ( htab_load() bad index 2113929216 (14848+0 entries) in htab stream (htab_shift=25) )
> 
> Did you have to make any changes to the qemu code to get that happy?

I should have mentioned that I tried only QEMU driven migration within
the same host using wp3-postcopy branch of your tree. I don't see the
above issue.

(qemu) info migrate
capabilities: xbzrle: off rdma-pin-all: off auto-converge: off zero-blocks: off compress: off x-postcopy-ram: on 
Migration status: completed
total time: 39432 milliseconds
downtime: 162 milliseconds
setup: 14 milliseconds
transferred ram: 1297209 kbytes
throughput: 270.72 mbps
remaining ram: 0 kbytes
total ram: 4194560 kbytes
duplicate: 734015 pages
skipped: 0 pages
normal: 318469 pages
normal bytes: 1273876 kbytes
dirty sync count: 4

I will try migration between different hosts soon and check.

Regards,
Bharata.