public inbox for kvm@vger.kernel.org
 help / color / mirror / Atom feed
From: Jan Kiszka <jan.kiszka@web.de>
To: qemu-devel <qemu-devel@nongnu.org>
Cc: kvm <kvm@vger.kernel.org>, Marcelo Tosatti <mtosatti@redhat.com>
Subject: Role of qemu_fair_mutex
Date: Mon, 03 Jan 2011 10:46:29 +0100	[thread overview]
Message-ID: <4D219AF5.2030204@web.de> (raw)

[-- Attachment #1: Type: text/plain, Size: 506 bytes --]

Hi,

at least in kvm mode, the qemu_fair_mutex seems to have lost its
function of balancing qemu_global_mutex access between the io-thread and
vcpus. It's now only taken by the latter, isn't it?

This and the fact that qemu-kvm does not use this kind of lock made me
wonder what its role is and if it is still relevant in practice. I'd
like to unify the execution models of qemu-kvm and qemu, and this lock
is the most obvious difference (there are surely more subtle ones as
well...).

Jan


[-- Attachment #2: OpenPGP digital signature --]
[-- Type: application/pgp-signature, Size: 259 bytes --]

             reply	other threads:[~2011-01-03  9:46 UTC|newest]

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2011-01-03  9:46 Jan Kiszka [this message]
2011-01-03 10:01 ` Role of qemu_fair_mutex Avi Kivity
2011-01-03 10:03   ` Jan Kiszka
2011-01-03 10:08     ` Avi Kivity
2011-01-04 14:17   ` Anthony Liguori
2011-01-04 14:27     ` Avi Kivity
2011-01-04 14:55       ` Anthony Liguori
2011-01-04 15:12         ` Avi Kivity
2011-01-04 15:43           ` Anthony Liguori
2011-01-05  8:55             ` Avi Kivity
2011-01-04 21:39     ` Marcelo Tosatti
2011-01-05 16:44       ` Anthony Liguori
2011-01-05 17:08         ` Avi Kivity

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=4D219AF5.2030204@web.de \
    --to=jan.kiszka@web.de \
    --cc=kvm@vger.kernel.org \
    --cc=mtosatti@redhat.com \
    --cc=qemu-devel@nongnu.org \
    /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 a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox