From: Stefan Hajnoczi <stefanha@gmail.com>
To: Peter Xu <peterx@redhat.com>
Cc: qemu-devel@nongnu.org, Laurent Vivier <lvivier@redhat.com>,
Fam Zheng <famz@redhat.com>, Juan Quintela <quintela@redhat.com>,
Markus Armbruster <armbru@redhat.com>,
mdroth@linux.vnet.ibm.com, Paolo Bonzini <pbonzini@redhat.com>,
"Dr . David Alan Gilbert" <dgilbert@redhat.com>
Subject: Re: [Qemu-devel] [RFC v2 0/8] monitor: allow per-monitor thread
Date: Wed, 6 Sep 2017 15:50:43 +0100 [thread overview]
Message-ID: <20170906145043.GG15535@stefanha-x1.localdomain> (raw)
In-Reply-To: <1503471071-2233-1-git-send-email-peterx@redhat.com>
On Wed, Aug 23, 2017 at 02:51:03PM +0800, Peter Xu wrote:
> The root problem is that, monitor commands are all handled in main
> loop thread now, no matter how many monitors we specify. And, if main
> loop thread hangs due to some reason, all monitors will be stuck.
I see a larger issue with postcopy: existing QEMU code assumes that
guest memory access is instantaneous.
Postcopy breaks this assumption and introduces blocking points that can
now take unbounded time.
This problem isn't specific to the monitor. It can also happen to other
components in QEMU like the gdbstub.
Do we need an asynchronous memory API? Synchronous memory access should
only be allowed in vcpu threads.
Stefan
next prev parent reply other threads:[~2017-09-06 14:50 UTC|newest]
Thread overview: 104+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-08-23 6:51 [Qemu-devel] [RFC v2 0/8] monitor: allow per-monitor thread Peter Xu
2017-08-23 6:51 ` [Qemu-devel] [RFC v2 1/8] monitor: move skip_flush into monitor_data_init Peter Xu
2017-08-23 16:31 ` Dr. David Alan Gilbert
2017-08-23 6:51 ` [Qemu-devel] [RFC v2 2/8] monitor: allow monitor to create thread to poll Peter Xu
2017-08-23 17:35 ` Dr. David Alan Gilbert
2017-08-25 4:25 ` Peter Xu
2017-08-25 9:30 ` Dr. David Alan Gilbert
2017-08-28 5:53 ` Peter Xu
2017-09-08 17:29 ` Dr. David Alan Gilbert
2017-08-25 15:27 ` Marc-André Lureau
2017-08-25 15:33 ` Dr. David Alan Gilbert
2017-08-25 16:07 ` Marc-André Lureau
2017-08-25 16:12 ` Dr. David Alan Gilbert
2017-08-25 16:21 ` Marc-André Lureau
2017-08-25 16:29 ` Dr. David Alan Gilbert
2017-08-26 8:33 ` Marc-André Lureau
2017-08-28 3:05 ` Peter Xu
2017-08-28 10:11 ` Marc-André Lureau
2017-08-28 12:48 ` Peter Xu
2017-09-05 18:58 ` Dr. David Alan Gilbert
2017-08-28 11:08 ` Markus Armbruster
2017-08-28 12:28 ` Marc-André Lureau
2017-08-28 16:24 ` Markus Armbruster
2017-08-28 17:24 ` Marc-André Lureau
2017-08-29 6:27 ` Markus Armbruster
2017-08-23 6:51 ` [Qemu-devel] [RFC v2 3/8] char-io: fix possible risk on IOWatchPoll Peter Xu
2017-08-25 14:44 ` Marc-André Lureau
2017-08-26 7:19 ` Fam Zheng
2017-08-28 5:56 ` Peter Xu
2017-08-23 6:51 ` [Qemu-devel] [RFC v2 4/8] QAPI: new QMP command option "without-bql" Peter Xu
2017-08-23 17:44 ` Dr. David Alan Gilbert
2017-08-23 23:37 ` Fam Zheng
2017-08-25 5:37 ` Peter Xu
2017-08-25 9:14 ` Dr. David Alan Gilbert
2017-08-28 8:08 ` Peter Xu
2017-09-08 17:38 ` Dr. David Alan Gilbert
2017-08-25 5:35 ` Peter Xu
2017-08-25 9:06 ` Dr. David Alan Gilbert
2017-08-28 8:26 ` Peter Xu
2017-09-08 17:52 ` Dr. David Alan Gilbert
2017-08-23 6:51 ` [Qemu-devel] [RFC v2 5/8] hmp: support "without_bql" Peter Xu
2017-08-23 17:46 ` Dr. David Alan Gilbert
2017-08-25 5:44 ` Peter Xu
2017-08-23 6:51 ` [Qemu-devel] [RFC v2 6/8] migration: qmp: migrate_incoming don't need BQL Peter Xu
2017-08-23 6:51 ` [Qemu-devel] [RFC v2 7/8] migration: hmp: " Peter Xu
2017-08-23 6:51 ` [Qemu-devel] [RFC v2 8/8] migration: add incoming mgmt lock Peter Xu
2017-08-23 18:01 ` Dr. David Alan Gilbert
2017-08-25 5:49 ` Peter Xu
2017-08-25 9:34 ` Dr. David Alan Gilbert
2017-08-28 8:39 ` Peter Xu
2017-08-29 11:03 ` [Qemu-devel] [RFC v2 0/8] monitor: allow per-monitor thread Daniel P. Berrange
2017-08-30 7:06 ` Markus Armbruster
2017-08-30 10:13 ` Daniel P. Berrange
2017-08-31 3:31 ` Peter Xu
2017-08-31 9:14 ` Daniel P. Berrange
2017-09-06 9:48 ` Dr. David Alan Gilbert
2017-09-06 10:46 ` Daniel P. Berrange
2017-09-06 10:48 ` Dr. David Alan Gilbert
2017-09-06 10:54 ` Daniel P. Berrange
2017-09-06 10:57 ` Dr. David Alan Gilbert
2017-09-06 11:06 ` Daniel P. Berrange
2017-09-06 11:31 ` Dr. David Alan Gilbert
2017-09-06 11:54 ` Daniel P. Berrange
2017-09-07 8:13 ` Peter Xu
2017-09-07 8:49 ` Stefan Hajnoczi
2017-09-07 9:18 ` Dr. David Alan Gilbert
2017-09-07 10:19 ` Stefan Hajnoczi
2017-09-07 10:24 ` Peter Xu
2017-09-07 8:55 ` Daniel P. Berrange
2017-09-07 9:19 ` Dr. David Alan Gilbert
2017-09-07 9:22 ` Daniel P. Berrange
2017-09-07 9:27 ` Dr. David Alan Gilbert
2017-09-07 11:19 ` Markus Armbruster
2017-09-07 11:31 ` Dr. David Alan Gilbert
2017-09-07 9:15 ` Dr. David Alan Gilbert
2017-09-07 9:25 ` Daniel P. Berrange
2017-09-07 12:59 ` Markus Armbruster
2017-09-07 13:22 ` Daniel P. Berrange
2017-09-07 17:41 ` Markus Armbruster
2017-09-07 18:09 ` Dr. David Alan Gilbert
2017-09-08 8:41 ` Markus Armbruster
2017-09-08 9:32 ` Dr. David Alan Gilbert
2017-09-08 11:49 ` Markus Armbruster
2017-09-08 13:19 ` Stefan Hajnoczi
2017-09-11 10:32 ` Peter Xu
2017-09-11 10:36 ` Peter Xu
2017-09-11 10:43 ` Daniel P. Berrange
2017-09-08 9:27 ` Daniel P. Berrange
2017-09-07 14:20 ` Dr. David Alan Gilbert
2017-09-07 17:41 ` Markus Armbruster
2017-09-07 18:04 ` Dr. David Alan Gilbert
2017-09-07 10:04 ` Dr. David Alan Gilbert
2017-09-07 10:08 ` Daniel P. Berrange
2017-09-07 13:59 ` Eric Blake
2017-09-06 14:50 ` Stefan Hajnoczi [this message]
2017-09-06 15:14 ` Dr. David Alan Gilbert
2017-09-07 7:38 ` Peter Xu
2017-09-07 8:58 ` Stefan Hajnoczi
2017-09-07 9:35 ` Dr. David Alan Gilbert
2017-09-07 10:09 ` Stefan Hajnoczi
2017-09-07 12:02 ` Peter Xu
2017-09-07 16:53 ` Stefan Hajnoczi
2017-09-07 17:14 ` Dr. David Alan Gilbert
2017-09-07 17:35 ` Stefan Hajnoczi
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20170906145043.GG15535@stefanha-x1.localdomain \
--to=stefanha@gmail.com \
--cc=armbru@redhat.com \
--cc=dgilbert@redhat.com \
--cc=famz@redhat.com \
--cc=lvivier@redhat.com \
--cc=mdroth@linux.vnet.ibm.com \
--cc=pbonzini@redhat.com \
--cc=peterx@redhat.com \
--cc=qemu-devel@nongnu.org \
--cc=quintela@redhat.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.