From: "Zhang Haoyu" <zhanghy@sangfor.com>
To: "Peter Crosthwaite" <peter.crosthwaite@xilinx.com>,
"William Dauchy" <wdauchy@gmail.com>
Cc: "Alex Bennée" <alex.bennee@linaro.org>,
Andreas_Färber <afaerber@suse.de>,
qemu-devel <qemu-devel@nongnu.org>
Subject: Re: [Qemu-devel] [questions] about qemu log
Date: Wed, 6 Aug 2014 09:23:26 +0800 [thread overview]
Message-ID: <201408060923243574967@sangfor.com> (raw)
In-Reply-To: CAEgOgz4=9a0xOQa=zRi69HE3ienKWoMRuBwc7nbB9Y8Xj9UGAA@mail.gmail.com
>>> The output is on qemu's stderr. You are in control of what that stderr is.
>>
>> I don't get why we can configure
>> -D /path/to/unique/file/name.log
>>
>> but we also have to redirect stderr (I didn't checked if the daemonize
>> option was closing it). What's the purpose of this logfile option?
>>
>
>Well -D will log to file only loggable (i.e. qemu_log()) information
>(which has all sorts of options and switches). Stderr, is a little
>more static and should in theory be limited to genuine errors. But if
>you want a combined log of both you can simply omit -D to default
>qemu_log output to stderr. This gives you a combined log that you can
>redirect anywhere. To be honest, this is what I do as a matter of
>course (2> foo rather than -D foo).
>
Maybe we can introduce a new qemu option to specify a error logfile where stderr be redirected, like below,
DEF("elogfile", HAS_ARG, QEMU_OPTION_elogfile, \
"-elogfile logfile redirect stderr log to logfile(default /var/log/qemu/<vm name>##.log)\n",
QEMU_ARCH_ALL)
STEXI
@item -elogfile @var{logfile}
@findex -elogfile
redirect stderr in @var{logfile}
ETEXI
then we can set the error log file through qemu command, /var/log/qemu/<vm name>##.log as default.
Thanks,
Zhang Haoyu
>There's plently of tree wide work to clean up the cases where stderr
>is used where qemu_log should be. If you are finding that log
>information is going to stderr instead of the log, patches would be
>welcome.
>
>Regards,
>Peter
next prev parent reply other threads:[~2014-08-06 1:25 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-07-25 6:42 [Qemu-devel] [questions] about qemu log Zhang Haoyu
2014-07-25 10:22 ` Alex Bennée
2014-07-25 11:07 ` Zhang Haoyu
2014-07-25 13:20 ` Andreas Färber
2014-07-26 2:28 ` Zhang Haoyu
2014-07-26 3:03 ` [Qemu-devel] [questions]_about_qemu_log Zhang Haoyu
2014-07-29 19:51 ` [Qemu-devel] [questions] about qemu log Eric Blake
2014-08-05 20:48 ` William Dauchy
2014-08-05 22:40 ` Peter Crosthwaite
2014-08-06 1:23 ` Zhang Haoyu [this message]
2014-08-06 2:49 ` Peter Crosthwaite
2014-08-06 3:41 ` Zhang Haoyu
2014-08-06 6:20 ` Markus Armbruster
2014-08-06 7:00 ` Zhang Haoyu
2014-08-06 7:42 ` Markus Armbruster
2014-08-06 12:04 ` Peter Crosthwaite
2014-08-06 10:43 ` William Dauchy
2014-08-06 20:42 ` William Dauchy
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