qemu-devel.nongnu.org archive mirror
 help / color / mirror / Atom feed
From: "Pavel Dovgalyuk" <dovgaluk@ispras.ru>
To: "'Kevin Wolf'" <kwolf@redhat.com>,
	"'Pavel Dovgalyuk'" <pavel.dovgaluk@gmail.com>
Cc: peter.maydell@linaro.org, pavel.dovgaluk@ispras.ru,
	quintela@redhat.com, ciro.santilli@gmail.com,
	jasowang@redhat.com, crosthwaite.peter@gmail.com,
	qemu-devel@nongnu.org, armbru@redhat.com, alex.bennee@linaro.org,
	maria.klimushenkova@ispras.ru, mst@redhat.com, kraxel@redhat.com,
	boost.lists@gmail.com, thomas.dullien@googlemail.com,
	pbonzini@redhat.com, mreitz@redhat.com,
	artem.k.pisarenko@gmail.com, dgilbert@redhat.com,
	rth@twiddle.net
Subject: Re: [Qemu-devel] [for-4.2 PATCH 3/6] replay: update docs for record/replay with block devices
Date: Wed, 18 Sep 2019 12:22:38 +0300	[thread overview]
Message-ID: <001201d56e02$9d88b5f0$d89a21d0$@ru> (raw)
In-Reply-To: <20190918091831.GD5207@localhost.localdomain>

> From: Kevin Wolf [mailto:kwolf@redhat.com]
> Am 17.09.2019 um 13:58 hat Pavel Dovgalyuk geschrieben:
> > From: Pavel Dovgalyuk <Pavel.Dovgaluk@ispras.ru>
> >
> > This patch updates the description of the command lines for using
> > record/replay with attached block devices.
> >
> > Signed-off-by: Pavel Dovgalyuk <Pavel.Dovgaluk@ispras.ru>
> > ---
> >  docs/replay.txt |   12 +++++++++---
> >  1 file changed, 9 insertions(+), 3 deletions(-)
> >
> > diff --git a/docs/replay.txt b/docs/replay.txt
> > index ee6aee9861..ce97c3f72f 100644
> > --- a/docs/replay.txt
> > +++ b/docs/replay.txt
> > @@ -27,7 +27,7 @@ Usage of the record/replay:
> >   * First, record the execution with the following command line:
> >      qemu-system-i386 \
> >       -icount shift=7,rr=record,rrfile=replay.bin \
> > -     -drive file=disk.qcow2,if=none,id=img-direct \
> > +     -drive file=disk.qcow2,if=none,snapshot,id=img-direct \
> >       -drive driver=blkreplay,if=none,image=img-direct,id=img-blkreplay \
> >       -device ide-hd,drive=img-blkreplay \
> >       -netdev user,id=net1 -device rtl8139,netdev=net1 \
> > @@ -35,7 +35,7 @@ Usage of the record/replay:
> >   * After recording, you can replay it by using another command line:
> >      qemu-system-i386 \
> >       -icount shift=7,rr=replay,rrfile=replay.bin \
> > -     -drive file=disk.qcow2,if=none,id=img-direct \
> > +     -drive file=disk.qcow2,if=none,snapshot,id=img-direct \
> >       -drive driver=blkreplay,if=none,image=img-direct,id=img-blkreplay \
> >       -device ide-hd,drive=img-blkreplay \
> >       -netdev user,id=net1 -device rtl8139,netdev=net1 \
> > @@ -223,7 +223,7 @@ Block devices record/replay module intercepts calls of
> >  bdrv coroutine functions at the top of block drivers stack.
> >  To record and replay block operations the drive must be configured
> >  as following:
> > - -drive file=disk.qcow2,if=none,id=img-direct
> > + -drive file=disk.qcow2,if=none,snapshot,id=img-direct
> >   -drive driver=blkreplay,if=none,image=img-direct,id=img-blkreplay
> >   -device ide-hd,drive=img-blkreplay
> >
> > @@ -252,6 +252,12 @@ This snapshot is created at start of recording and restored at start
> >  of replaying. It also can be loaded while replaying to roll back
> >  the execution.
> >
> > +'snapshot' flag of the disk image must be removed to save the snapshots
> > +in the overlay (or original image) instead of using the temporary overlay.
> > + -drive file=disk.ovl,if=none,id=img-direct
> > + -drive driver=blkreplay,if=none,image=img-direct,id=img-blkreplay
> > + -device ide-hd,drive=img-blkreplay
> 
> Wait, didn't patch 2 just make -snapshot unconditionally incompatible
> with replay? So isn't saving the snapshot in the original image the only
> supported mode now?

There are two ways to run record/replay:
1. Disk with snapshot option and any image to make it unchanged
2. Disk with overlay without snapshot option to save VM snapshots on it

Pavel Dovgalyuk



  reply	other threads:[~2019-09-18  9:24 UTC|newest]

Thread overview: 36+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-09-17 11:57 [Qemu-devel] [for-4.2 PATCH 0/6] Block-related record/replay fixes Pavel Dovgalyuk
2019-09-17 11:57 ` [Qemu-devel] [for-4.2 PATCH 1/6] block: implement bdrv_snapshot_goto for blkreplay Pavel Dovgalyuk
2019-09-17 11:57 ` [Qemu-devel] [for-4.2 PATCH 2/6] replay: disable default snapshot for record/replay Pavel Dovgalyuk
2019-09-17 11:58 ` [Qemu-devel] [for-4.2 PATCH 3/6] replay: update docs for record/replay with block devices Pavel Dovgalyuk
2019-09-18  9:18   ` Kevin Wolf
2019-09-18  9:22     ` Pavel Dovgalyuk [this message]
2019-09-18  9:33       ` Kevin Wolf
2019-09-18  9:37         ` Pavel Dovgalyuk
2019-09-18  9:44           ` Kevin Wolf
2019-09-18  9:52             ` Pavel Dovgalyuk
2019-09-19  8:53               ` Kevin Wolf
2019-09-19  9:05                 ` Pavel Dovgalyuk
2019-09-19 11:27                   ` Kevin Wolf
2019-09-19 12:10                     ` Pavel Dovgalyuk
2019-09-19 13:00                       ` Kevin Wolf
2019-09-20  7:25                         ` Pavel Dovgalyuk
2019-09-20 10:01                           ` Kevin Wolf
2019-09-23  6:15                             ` Pavel Dovgalyuk
2019-09-25  9:02                             ` Pavel Dovgalyuk
2019-10-01  8:22                               ` Pavel Dovgalyuk
2019-10-10 15:28                               ` Kevin Wolf
2019-10-11  6:10                                 ` Pavel Dovgalyuk
2019-10-11  9:12                                   ` Kevin Wolf
2019-10-18 12:06                                     ` Pavel Dovgalyuk
2019-10-18 14:16                                       ` Kevin Wolf
2019-09-17 11:58 ` [Qemu-devel] [for-4.2 PATCH 4/6] replay: don't drain/flush bdrv queue while RR is working Pavel Dovgalyuk
2019-09-17 11:58 ` [Qemu-devel] [for-4.2 PATCH 5/6] replay: finish record/replay before closing the disks Pavel Dovgalyuk
2019-09-17 11:58 ` [Qemu-devel] [for-4.2 PATCH 6/6] replay: add BH oneshot event for block layer Pavel Dovgalyuk
2019-09-17 18:09 ` [Qemu-devel] [for-4.2 PATCH 0/6] Block-related record/replay fixes no-reply
2019-09-17 18:10 ` no-reply
2019-09-17 19:01 ` Alex Bennée
2019-09-18  8:26   ` Pavel Dovgalyuk
2019-09-18 10:42     ` Alex Bennée
2019-09-18 11:32       ` Pavel Dovgalyuk
2019-10-11  9:17 ` Kevin Wolf
  -- strict thread matches above, loose matches on Subject: below --
2019-07-29  6:29 [Qemu-devel] " Pavel Dovgalyuk
2019-07-29  6:29 ` [Qemu-devel] [for-4.2 PATCH 3/6] replay: update docs for record/replay with block devices Pavel Dovgalyuk

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='001201d56e02$9d88b5f0$d89a21d0$@ru' \
    --to=dovgaluk@ispras.ru \
    --cc=alex.bennee@linaro.org \
    --cc=armbru@redhat.com \
    --cc=artem.k.pisarenko@gmail.com \
    --cc=boost.lists@gmail.com \
    --cc=ciro.santilli@gmail.com \
    --cc=crosthwaite.peter@gmail.com \
    --cc=dgilbert@redhat.com \
    --cc=jasowang@redhat.com \
    --cc=kraxel@redhat.com \
    --cc=kwolf@redhat.com \
    --cc=maria.klimushenkova@ispras.ru \
    --cc=mreitz@redhat.com \
    --cc=mst@redhat.com \
    --cc=pavel.dovgaluk@gmail.com \
    --cc=pavel.dovgaluk@ispras.ru \
    --cc=pbonzini@redhat.com \
    --cc=peter.maydell@linaro.org \
    --cc=qemu-devel@nongnu.org \
    --cc=quintela@redhat.com \
    --cc=rth@twiddle.net \
    --cc=thomas.dullien@googlemail.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 a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).