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From: Stefan Hajnoczi <stefanha@redhat.com>
To: Stefan Hajnoczi <stefanha@gmail.com>,
	Riku Voipio <riku.voipio@iki.fi>,
	qemu-devel@nongnu.org
Subject: Re: [Qemu-devel] [PATCH 3/6] hypertrace: [*-user] Add QEMU-side proxy to "guest_hypertrace" event
Date: Tue, 23 Aug 2016 11:52:24 -0400	[thread overview]
Message-ID: <20160823155224.GA3948@stefanha-x1.localdomain> (raw)
In-Reply-To: <87inuupbbw.fsf@fimbulvetr.bsc.es>

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On Sun, Aug 21, 2016 at 02:15:31PM +0200, Lluís Vilanova wrote:
> > Can this approach be made thread-safe?
> 
> > If not then it would be good to consider the problem right away and
> > switch to something that is thread-safe, even if it depends on the
> > target architecture.
> 
> Kind of. The easiest solution is to have each thread have an mmap of its own of
> the device (and moving qemu_control_{0,1} into CPUState). This would be
> completely explicit and easy to understand.

Yes.  I don't know if the TCG and -user folks will accept the SIGSEGV
approach, but I'd be okay with it if the multi-threading issue is solved
by 1 device per thread.

Stefan

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  reply	other threads:[~2016-08-23 21:12 UTC|newest]

Thread overview: 68+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-08-05 16:59 [Qemu-devel] [PATCH 0/6] hypertrace: Lightweight guest-to-QEMU trace channel Lluís Vilanova
2016-08-05 16:59 ` [Qemu-devel] [PATCH 1/6] hypertrace: Add documentation Lluís Vilanova
2016-08-05 17:17   ` Eric Blake
2016-08-08 13:02     ` Lluís Vilanova
2016-08-05 16:59 ` [Qemu-devel] [PATCH 2/6] hypertrace: Add tracing event "guest_hypertrace" Lluís Vilanova
2016-08-18  9:59   ` Stefan Hajnoczi
2016-08-18 10:32     ` Lluís Vilanova
2016-08-05 16:59 ` [Qemu-devel] [PATCH 3/6] hypertrace: [*-user] Add QEMU-side proxy to "guest_hypertrace" event Lluís Vilanova
2016-08-05 17:23   ` Eric Blake
2016-08-08 13:08     ` Lluís Vilanova
2016-08-18 10:17   ` Stefan Hajnoczi
2016-08-21 12:15     ` Lluís Vilanova
2016-08-23 15:52       ` Stefan Hajnoczi [this message]
2016-08-05 16:59 ` [Qemu-devel] [PATCH 4/6] hypertrace: [softmmu] " Lluís Vilanova
2016-08-05 16:59 ` [Qemu-devel] [PATCH 5/6] hypertrace: Add guest-side user-level library Lluís Vilanova
2016-08-05 16:59 ` [Qemu-devel] [PATCH 6/6] hypertrace: Add guest-side Linux module Lluís Vilanova
2016-08-18  9:47 ` [Qemu-devel] [PATCH 0/6] hypertrace: Lightweight guest-to-QEMU trace channel Stefan Hajnoczi
2016-08-18  9:47   ` Stefan Hajnoczi
2016-08-18 10:22   ` [Qemu-devel] " Lluís Vilanova
2016-08-18 13:53     ` Stefan Hajnoczi
2016-08-18 14:21       ` Luiz Capitulino
2016-08-21 12:17         ` Lluís Vilanova
2016-08-21 12:17         ` Lluís Vilanova
2016-08-18 14:21       ` Luiz Capitulino
2016-08-18 13:53     ` Stefan Hajnoczi
2016-08-18 10:22   ` Lluís Vilanova
2016-08-18 10:54 ` Stefan Hajnoczi
2016-08-18 10:54   ` Stefan Hajnoczi
2016-08-18 13:37   ` [Qemu-devel] " Luiz Capitulino
2016-08-19  4:45     ` Masami Hiramatsu
2016-08-19  4:45       ` Masami Hiramatsu
2016-08-18 13:37   ` [Qemu-devel] " Luiz Capitulino
2016-08-18 16:19   ` Steven Rostedt
2016-08-19 10:02     ` Stefan Hajnoczi
2016-08-19 13:30       ` Steven Rostedt
2016-08-19 13:30       ` Steven Rostedt
2016-08-19 10:02     ` Stefan Hajnoczi
2016-08-18 16:19   ` Steven Rostedt
2016-08-21 12:32   ` Lluís Vilanova
2016-08-23 15:54     ` Stefan Hajnoczi
2016-08-23 15:54     ` Stefan Hajnoczi
2016-08-24 10:25       ` Lluís Vilanova
2016-08-29 13:45         ` Stefan Hajnoczi
2016-08-29 13:45           ` Stefan Hajnoczi
2016-08-29 18:46           ` [Qemu-devel] " Lluís Vilanova
2016-08-29 18:46           ` Lluís Vilanova
2016-08-31 16:35             ` Stefan Hajnoczi
2016-08-31 16:35             ` Stefan Hajnoczi
2016-09-05 14:37               ` Lluís Vilanova
2016-09-05 14:37               ` Lluís Vilanova
2016-09-05 19:20                 ` Masami Hiramatsu
2016-09-05 19:20                   ` Masami Hiramatsu
2016-09-06 12:59                   ` [Qemu-devel] " Lluís Vilanova
2016-09-06 12:59                   ` Lluís Vilanova
2016-09-13 13:52                 ` Stefan Hajnoczi
2016-09-13 13:52                   ` Stefan Hajnoczi
2016-09-13 16:50                   ` [Qemu-devel] " Lluís Vilanova
2016-09-13 16:50                   ` Lluís Vilanova
2016-09-05 14:59             ` Daniel P. Berrange
2016-09-05 14:59               ` Daniel P. Berrange
2016-09-05 18:29               ` [Qemu-devel] " Lluís Vilanova
2016-09-05 18:59                 ` Daniel P. Berrange
2016-09-06  8:54                   ` Lluís Vilanova
2016-09-06  8:54                   ` Lluís Vilanova
2016-09-05 18:59                 ` Daniel P. Berrange
2016-09-05 18:29               ` Lluís Vilanova
2016-08-24 10:25       ` Lluís Vilanova
2016-08-21 12:32   ` Lluís Vilanova

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