From mboxrd@z Thu Jan  1 00:00:00 1970
Received: from mailman by lists.gnu.org with tmda-scanned (Exim 4.43)
	id 1NF9PZ-00086S-Pq
	for qemu-devel@nongnu.org; Mon, 30 Nov 2009 11:47:43 -0500
Received: from exim by lists.gnu.org with spam-scanned (Exim 4.43)
	id 1NF9PU-000844-3B
	for qemu-devel@nongnu.org; Mon, 30 Nov 2009 11:47:40 -0500
Received: from [199.232.76.173] (port=58705 helo=monty-python.gnu.org)
	by lists.gnu.org with esmtp (Exim 4.43) id 1NF9PR-00083Z-HK
	for qemu-devel@nongnu.org; Mon, 30 Nov 2009 11:47:34 -0500
Received: from mail-iw0-f197.google.com ([209.85.223.197]:37923)
	by monty-python.gnu.org with esmtp (Exim 4.60)
	(envelope-from <glommer@gmail.com>) id 1NF9PQ-0007Ph-G1
	for qemu-devel@nongnu.org; Mon, 30 Nov 2009 11:47:32 -0500
Received: by iwn35 with SMTP id 35so2215486iwn.4
	for <qemu-devel@nongnu.org>; Mon, 30 Nov 2009 08:47:31 -0800 (PST)
MIME-Version: 1.0
In-Reply-To: <4B13F570.4030605@redhat.com>
References: <1259256300-23937-1-git-send-email-glommer@redhat.com>
	<4B12B042.9020409@web.de>
	<5d6222a80911300342x4d29653as6c23acac598dec64@mail.gmail.com>
	<5d6222a80911300755o4fed5447w9ddae1abaccf7100@mail.gmail.com>
	<4B13F570.4030605@redhat.com>
Date: Mon, 30 Nov 2009 14:47:31 -0200
Message-ID: <5d6222a80911300847w2faa9d39nb2fc6ee3ccb9ccfd@mail.gmail.com>
Subject: Re: [Qemu-devel] Re: [PATCH 0/7] KVM SMP support, early version
From: Glauber Costa <glommer@gmail.com>
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: quoted-printable
List-Id: qemu-devel.nongnu.org
List-Unsubscribe: <http://lists.nongnu.org/mailman/listinfo/qemu-devel>,
	<mailto:qemu-devel-request@nongnu.org?subject=unsubscribe>
List-Archive: <http://lists.gnu.org/pipermail/qemu-devel>
List-Post: <mailto:qemu-devel@nongnu.org>
List-Help: <mailto:qemu-devel-request@nongnu.org?subject=help>
List-Subscribe: <http://lists.nongnu.org/mailman/listinfo/qemu-devel>,
	<mailto:qemu-devel-request@nongnu.org?subject=subscribe>
To: Avi Kivity <avi@redhat.com>
Cc: Glauber Costa <glommer@redhat.com>, Jan Kiszka <jan.kiszka@web.de>, aliguori@us.ibm.com, qemu-devel@nongnu.org

On Mon, Nov 30, 2009 at 2:40 PM, Avi Kivity <avi@redhat.com> wrote:
> On 11/30/2009 05:55 PM, Glauber Costa wrote:
>>
>> reset code is responsible for most remote calls in qemu. One of the
>> only ones we still
>> have left is the gdb stuff. Do you have any suggestion to do that
>> without the current
>> on_vcpu mechanism?
>>
>
> No. =C2=A0But what's wrong with on_vcpu?

intrinsically racy. signal passing slow down things, etc.

That said, as I've stated many times: I don't believe there's anything
fundamentally wrong with on_vcpu. But we might get benefits from a re-desig=
n
of things to avoid it whenever possible. (just like the vcpu_reset()
I've just posted)


--=20
Glauber  Costa.
"Free as in Freedom"
http://glommer.net

"The less confident you are, the more serious you have to act."