linux-kernel - Re: [Qemu-devel] [PATCH 19/23] userfaultfd: activate syscall

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Message-ID: <20150908095915.GC678@in.ibm.com>
Date:	Tue, 8 Sep 2015 15:30:30 +0530
From:	Bharata B Rao <bharata@...ux.vnet.ibm.com>
To:	"Dr. David Alan Gilbert" <dgilbert@...hat.com>
Cc:	Michael Ellerman <mpe@...erman.id.au>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	qemu-devel@...gnu.org, kvm@...r.kernel.org,
	linux-api@...r.kernel.org, zhang.zhanghailiang@...wei.com,
	Pavel Emelyanov <xemul@...allels.com>,
	Johannes Weiner <hannes@...xchg.org>,
	Hugh Dickins <hughd@...gle.com>,
	Sanidhya Kashyap <sanidhya.gatech@...il.com>,
	Dave Hansen <dave.hansen@...el.com>,
	Andres Lagar-Cavilla <andreslc@...gle.com>,
	Mel Gorman <mgorman@...e.de>,
	Paolo Bonzini <pbonzini@...hat.com>,
	"Kirill A. Shutemov" <kirill@...temov.name>,
	"Huangpeng (Peter)" <peter.huangpeng@...wei.com>,
	Andy Lutomirski <luto@...capital.net>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Peter Feiner <pfeiner@...gle.com>,
	linuxppc-dev@...ts.ozlabs.org
Subject: Re: [Qemu-devel] [PATCH 19/23] userfaultfd: activate syscall

On Tue, Sep 08, 2015 at 09:59:47AM +0100, Dr. David Alan Gilbert wrote:
> * Bharata B Rao (bharata@...ux.vnet.ibm.com) 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.

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