Re: [PATCH v7 0/2] perf: add support for logging debug messages to file

[Andi Kleen]

Changbin Du <changbin.du@xxxxxxxxx> writes:

> When in TUI mode, it is impossible to show all the debug messages to
> console. This make it hard to debug perf issues using debug messages.
> This patch adds support for logging debug messages to file to resolve
> this problem.

This was already solved in

commit f78eaef0e0493f6068777a246b9c4d9d5cf2b7aa
Author: Andi Kleen <ak@xxxxxxxxxxxxxxx>
Date:   Fri Nov 21 13:38:00 2014 -0800

    perf tools: Allow to force redirect pr_debug to stderr.

    When debugging the tui browser I find it useful to redirect the
    debug
        log into a file. Currently it's always forced to the message
    line.

    Add an option to force it to stderr. Then it can be easily
    redirected.
    
You can do

perf report --debug stderr 2> file ...

-Andi