[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: [Qemu-devel] [PATCH v4 00/11] simplify usage of tracepoints, and con
From: |
Eric Blake |
Subject: |
Re: [Qemu-devel] [PATCH v4 00/11] simplify usage of tracepoints, and connect them to logging |
Date: |
Thu, 7 Jan 2016 10:04:56 -0700 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.4.0 |
On 01/07/2016 06:55 AM, Denis V. Lunev wrote:
> This series does three things:
>
> 1) add a "-trace [enable=]foo" option to enable one or more trace
> events, and a "-trace help" option to show the list of tracepoints
> (patches 4-5)
>
> 2) change the stderr tracing backend so that it prints to the
> -D log file, and enable it by default. "-trace file=..." is
> now a synonym of -D if the log backend is enabled (patches 7-8)
>
> 3) add a "-d trace:foo" option that is a synonym for "-trace foo";
> this makes the new functionality more discoverable to people used
> to "-d", makes it available for user-mode emulation (which does
> not have -trace), and is somewhat nice if you want to enable both
> tracepoints and some other "-d" flag (patch 9). When globbing
> it is also less susceptible to unwanted shell expansion.
>
> For example, you can trace block device I/O and save the result
> to a file just by adding "-trace bdrv_aio_*,file=trace.txt", or
> correlate it to guest PCs with "-d exec,nochain,trace:bdrv_aio_*".
>
> Opinions? I would like to have this in 2.5 if there is agreement.
Stale sentence :)
--
Eric Blake eblake redhat com +1-919-301-3266
Libvirt virtualization library http://libvirt.org
signature.asc
Description: OpenPGP digital signature
- [Qemu-devel] [PATCH 04/11] trace: no need to call trace_backend_init in different branches now, (continued)
- [Qemu-devel] [PATCH 04/11] trace: no need to call trace_backend_init in different branches now, Denis V. Lunev, 2016/01/07
- [Qemu-devel] [PATCH 05/11] trace: add "-trace enable=...", Denis V. Lunev, 2016/01/07
- [Qemu-devel] [PATCH 06/11] trace: add "-trace help", Denis V. Lunev, 2016/01/07
- [Qemu-devel] [PATCH 08/11] log: move qemu-log.c into util/ directory, Denis V. Lunev, 2016/01/07
- [Qemu-devel] [PATCH 03/11] trace: split trace_init_file out of trace_init_backends, Denis V. Lunev, 2016/01/07
- [Qemu-devel] [PATCH 02/11] trace: split trace_init_events out of trace_init_backends, Denis V. Lunev, 2016/01/07
- [Qemu-devel] [PATCH 10/11] trace: switch default backend to "log", Denis V. Lunev, 2016/01/07
- [Qemu-devel] [PATCH 11/11] log: add "-d trace:PATTERN", Denis V. Lunev, 2016/01/07
- [Qemu-devel] [PATCH 09/11] trace: convert stderr backend to log, Denis V. Lunev, 2016/01/07
- [Qemu-devel] [PATCH 07/11] log: do not unnecessarily include qom/cpu.h, Denis V. Lunev, 2016/01/07
- Re: [Qemu-devel] [PATCH v4 00/11] simplify usage of tracepoints, and connect them to logging,
Eric Blake <=
- Re: [Qemu-devel] [PATCH v4 00/11] simplify usage of tracepoints, and connect them to logging, Denis V. Lunev, 2016/01/14
- Re: [Qemu-devel] [PATCH v4 00/11] simplify usage of tracepoints, and connect them to logging, Stefan Hajnoczi, 2016/01/15