Re: How to let `profiler-report` show more info for `redisplay_internal`?

[Eli Zaretskii]

> Date: Mon, 2 Sep 2024 11:02:50 +0800
> From: Eval EXEC <execvy@gmail.com>
> 
>           103  94% - redisplay_internal (C function)
>             3   2%  - eval
>             2   1%   - minions--prominent-modes
>             2   1%    - cl-remove-if-not
>             2   1%     - cl-remove
>             1   0%        cl-ldiff
>             1   0%   - mode--line-format-right-align
>             1   0%    - eval
>             1   0%     - minions--prominent-modes
>             1   0%      - cl-remove-if-not
>             1   0%         cl-remove
>             6   5% - timer-event-handler
>             6   5%  - apply
>             6   5%   - #<native-comp-function 
> F616e6f6e796d6f75732d6c616d626461_anonymous_lambda_23>
>             6   5%      jit-lock-context-fontify
>             0   0%   ...
> ```
> 
> 
> I noticed that `redisplay_internal` is consuming 94% of the CPU, but the 
> sum of the child items below `redisplay_internal` is less than 2%. Where 
> is the remaining 92% going? I'd like to see a more detailed CPU profile 
> for `redisplay_internal`.
> 
> Is it possible to get a detailed CPU profile for `redisplay_internal`?

No, you cannot, because redisplay_internal is written in C, and
profiler.el can only analyze profiles of Lisp code.

You need to use a tool like prof for profiling C code.

Sorry.