Re: [PATCH v3 0/8] [RfC] fix tracing for modules

[Gerd Hoffmann]

  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