On Mon, Jun 12, 2023 at 02:38:44PM -0500, Eric Blake wrote:
> On Mon, Jun 12, 2023 at 07:27:53PM +0100, Richard W.M. Jones wrote:
> > Logging state transitions in debug mode produces huge amounts of
> > output which is not especially helpful. This change removes this
> > debugging output. This reduces the debug output by approximately two
> > thirds.
> > ---
> > generator/state_machine_generator.ml | 12 ------------
> > 1 file changed, 12 deletions(-)
> >
> > diff --git a/generator/state_machine_generator.ml
> > b/generator/state_machine_generator.ml
> > index 274e290952..52c497646d 100644
> > --- a/generator/state_machine_generator.ml
> > +++ b/generator/state_machine_generator.ml
> > @@ -380,9 +380,6 @@ let
> > pr " h, &next, blocked\n";
> > pr " );\n";
> > pr " if (get_next_state (h) != next) {\n";
> > - pr " debug (h, \"transition: %%s -> %%s\",\n";
> > - pr " \"%s\",\n" display_name;
> > - pr " nbd_internal_state_short_string (next));\n";
> > pr " set_next_state (h, next);\n";
> > pr " }\n";
> > pr " return r;\n";
> > @@ -423,15 +420,6 @@ let
> > pr " case %s:\n" (c_string_of_external_event e);
> > if state != next_state then (
> > pr " set_next_state (h, %s);\n"
> > next_state.parsed.state_enum;
> > - pr " debug (";
> > - let print_debug_args () =
> > - pr "h, \"event %%s: %%s -> %%s\", ";
> > - pr "\"%s\", \"%s\", \"%s\");"
> > - (string_of_external_event e)
> > - display_name next_state.parsed.display_name;
> > - in
> > - pr_wrap ',' print_debug_args;
> > - pr "\n"
>
> All that work Laszlo did to nicely wrap these lines. If we decide to
> go with a multi-level debug (DEBUG=1 being the default for 'make
> check', DEBUG=2 for extra-verbose debugging), we'd probably implement
> that by either adding an argument to the existing debug() macro, or
> adding yet another macro that takes an explicit level (and the
> existing debug() macro forwards to the other macro with a level of 1),
> so it's not too hard to choose which lines are super-verbose-only.
>
> But I'm fine with this patch as-is, if we don't have a strong reason
> to keep the state transitions in the debug logs.
>
> Reviewed-by: Eric Blake <[email protected]>
Thanks!
So what I did in the end is to add your suggestion of using
./configure CFLAGS="-DLIBNBD_STATE_VERBOSE=1" to enable these
messages, which also keeps Laszlo's work intact.
Commit b66f383fae532bf502a5687ab93639a5273a3dfd
Rich.
--
Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones
Read my programming and virtualization blog: http://rwmj.wordpress.com
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