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Re: [Qemu-devel] [PATCH 11/11] log: add "-d trace:PATTERN"
From: |
Eric Blake |
Subject: |
Re: [Qemu-devel] [PATCH 11/11] log: add "-d trace:PATTERN" |
Date: |
Mon, 26 Oct 2015 11:07:55 -0600 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.3.0 |
On 10/26/2015 07:12 AM, Lluís Vilanova wrote:
> Denis V Lunev writes:
>
>> From: Paolo Bonzini <address@hidden>
>> This is a bit easier to use than "-trace" if you are also enabling
>> other kinds of logging. It is also more discoverable for experienced
>> QEMU users, and accessible from user-mode emulators.
>
> I'm not sure this should be added, since the same functionality is also
> available through "-trace enable=<pattern>" (and the shortcut "-trace
> <pattern>").
Having more than one way to do something is not necessarily bad; it does
imply more maintenance to keep both ways working, but if one way is more
discoverable than the other it may be worth it.
>
> Also, I'd rather fold event name discovery into "-trace enable=?" (and the
> shortcut "-trace ?"), mimicking the format already available for CPUs ("-cpu
> ?").
>
If we do that, we should also support '-trace enable=help', because ? is
a shell metacharacter, and we have been moving towards using 'help'
rather than '?' to minimize the need for shell quoting when asking for help.
--
Eric Blake eblake redhat com +1-919-301-3266
Libvirt virtualization library http://libvirt.org
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- Re: [Qemu-devel] [PATCH 01/11] trace: fix documentation, (continued)
- [Qemu-devel] [PATCH 08/11] log: move qemu-log.c into util/ directory, Denis V. Lunev, 2015/10/26
- [Qemu-devel] [PATCH 06/11] trace: add "-trace help", Denis V. Lunev, 2015/10/26
- [Qemu-devel] [PATCH 09/11] trace: convert stderr backend to log, Denis V. Lunev, 2015/10/26
- [Qemu-devel] [PATCH 07/11] log: do not unnecessarily include qom/cpu.h, Denis V. Lunev, 2015/10/26
- [Qemu-devel] [PATCH 10/11] trace: switch default backend to "log", Denis V. Lunev, 2015/10/26
Re: [Qemu-devel] [PATCH v2 00/11] simplify usage of tracepoints, and connect them to logging, Stefan Hajnoczi, 2015/10/29