Re: [PATCH v3 5/5] bitmap: add trace2 outputs during open "bitmap" file

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On 6/23/22 5:38 AM, Teng Long wrote:
On Wed, 22 Jun 2022 08:51:18 -0400, Jeff Hostetler wrote:

[...]
I remove the changes of "repo_config_bool" from my v4 patch
then I try to know about "GIT_TRACE2_CONFIG_PARAMS" and
"trace2.configparams". Thereby, when I:

Execute "GIT_TRACE2_PERF=1 GIT_TRACE2_CONFIG_PARAMS=core.multipackIndex git rev-list  --test-bitmap HEAD"

15:21:38.812782 git.c:461                    | d0 | main                     | def_param    |     |           |           |              | core.multipackindex:false
15:21:38.812797 git.c:461                    | d0 | main                     | def_param    |     |           |           |              | core.multipackindex:false

I checked my configs, I found if there exists multiple level configs.
it'll print multiple times. Like If I config all the global, system
and local on "core.multipackIndex=false" , the output will be:

15:41:50.614108 git.c:462                    | d0 | main                     | def_param    |     |           |           |              | core.multipackindex:false
15:41:50.614123 git.c:462                    | d0 | main                     | def_param    |     |           |           |              | core.multipackindex:false
15:41:50.614136 git.c:462                    | d0 | main                     | def_param    |     |           |           |              | core.multipackindex:false

And if I modified the local scope of core.multipackIndex to "true",
the output will be:

15:45:39.200172 git.c:462                    | d0 | main                     | def_param    |     |           |           |              | core.multipackindex:false
15:45:39.200186 git.c:462                    | d0 | main                     | def_param    |     |           |           |              | core.multipackindex:false
15:45:39.200200 git.c:462                    | d0 | main                     | def_param    |     |           |           |              | core.multipackindex:true

I'm not sure it's an intentional design or here should be only
print the final value that takes effect or should print all the
values if config multiple scopes on the same config.

Hence, I made a temporary patch below to try to add some
identifying information to know why we output these lines, like:

I had intended it to only print the final "effective" value
that the command would actually use.  I don't remember if I
ever experimented with config values that are set at multiple
levels, but testing it now shows that you're right it does
print a "def_param" message for each level.

I would suggest we fix it to only print the final value
since we really just want to know whether the command will
or will not use a feature.  The inheritance is somewhat
irrelevant.

But the change to do that may be quite a mess, so printing
the scope name as you have here is fine.  And may help with
support when debugging users having confusing problems, so
I'm fine with it.

Thanks,
Jeff




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