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From: Gerd Hoffmann <kraxel@redhat.com>
To: "Daniel P. Berrangé" <berrange@redhat.com>
Cc: "Dr. David Alan Gilbert" <dgilbert@redhat.com>,
	Markus Armbruster <armbru@redhat.com>,
	Stefan Hajnoczi <stefanha@redhat.com>,
	qemu-devel@nongnu.org
Subject: Re: [PATCH v3 0/8] [RfC] fix tracing for modules
Date: Fri, 26 Mar 2021 13:47:00 +0100	[thread overview]
Message-ID: <20210326124700.taujcpo2xqbn2pzj@sirius.home.kraxel.org> (raw)
In-Reply-To: <YFiHnr/uguP8/Vtz@redhat.com>

  Hi,

> eg a trace point "dma_map_wait" gets mapped to probes in many
> .stp files, once per target, because we need to match based on
> the executable path:
> 
>   probe qemu.system.x86_64.dma_map_wait = process("/usr/libexec/qemu-system-x86_64").mark("dma_map_wait")
>   probe qemu.system.x86_64.dma_map_wait = process("/usr/libexec/qemu-system-ppc64").mark("dma_map_wait")

Probe qemu.system.ppc64.dma_map_wait = ...

Can I trace qemu started from build directory?
Seems scripts/qemu-trace-stap doesn't support that.

>   qxl.destroy_primary(int qid) "%d"
>   qxl.enter_vga_mode(int qid) "%d"
>   qxl.exit_vga_mode(int qid) "%d"
> 
> this would be backwards compatible, as we can turn the "." back into
> a "_" for all existing trace backends, except stp.

Hmm, not sure I like this inconsistency.  I think names should be the
same no matter which trace backend is used.

take care,
  Gerd



  reply	other threads:[~2021-03-26 12:48 UTC|newest]

Thread overview: 34+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-01-21 12:50 [PATCH v3 0/8] [RfC] fix tracing for modules Gerd Hoffmann
2021-01-21 12:50 ` [PATCH v3 1/8] meson: add trace_events_config[] Gerd Hoffmann
2021-01-27 14:48   ` Stefan Hajnoczi
2021-01-21 12:50 ` [PATCH v3 2/8] meson: move up hw subdir (specifically before trace subdir) Gerd Hoffmann
2021-01-27 14:49   ` Stefan Hajnoczi
2021-01-21 12:50 ` [PATCH v3 3/8] meson: add module_trace & module_trace_src Gerd Hoffmann
2021-01-27 15:03   ` Stefan Hajnoczi
2021-01-21 12:50 ` [PATCH v3 4/8] meson: move qxl trace events to separate file Gerd Hoffmann
2021-01-27 15:33   ` Stefan Hajnoczi
2021-03-22 11:43   ` Daniel P. Berrangé
2021-01-21 12:50 ` [PATCH v3 5/8] trace: iter init tweaks Gerd Hoffmann
2021-02-03 16:13   ` Stefan Hajnoczi
2021-01-21 12:50 ` [PATCH v3 6/8] trace: add trace_event_iter_init_group Gerd Hoffmann
2021-02-03 16:16   ` Stefan Hajnoczi
2021-01-21 12:50 ` [PATCH v3 7/8] trace/simple: pass iter to st_write_event_mapping Gerd Hoffmann
2021-02-03 16:17   ` Stefan Hajnoczi
2021-01-21 12:50 ` [PATCH v3 8/8] trace/simple: add st_init_group Gerd Hoffmann
2021-02-03 16:22   ` Stefan Hajnoczi
2021-02-03 16:32 ` [PATCH v3 0/8] [RfC] fix tracing for modules Stefan Hajnoczi
2021-02-22 15:13   ` Gerd Hoffmann
2021-03-22 11:36     ` Stefan Hajnoczi
2021-03-22 11:46       ` Daniel P. Berrangé
2021-03-29 16:32         ` Stefan Hajnoczi
2021-03-22 12:03     ` Daniel P. Berrangé
2021-03-26 12:47       ` Gerd Hoffmann [this message]
2021-03-29  9:23         ` Daniel P. Berrangé
2021-03-29  9:48           ` Gerd Hoffmann
2021-03-29 10:02             ` Daniel P. Berrangé
2021-03-31 10:55               ` Gerd Hoffmann
2021-04-09  9:10               ` Gerd Hoffmann
2021-04-09 13:12       ` Gerd Hoffmann
2021-04-09 13:17         ` Daniel P. Berrangé
2021-04-12 13:07           ` Gerd Hoffmann
2021-04-15 13:10             ` Daniel P. Berrangé

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