linux-kernel - Re: string_selftest_init needs 636 ms to run

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Date:   Mon, 12 Mar 2018 15:17:23 +0100
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Paul Menzel <pmenzel@...gen.mpg.de>
Cc:     Matthew Wilcox <mawilcox@...rosoft.com>,
        Shuah Khan <shuah@...nel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: string_selftest_init needs 636 ms to run

Hi Paul,

On Mon, Mar 12, 2018 at 2:45 PM, Paul Menzel <pmenzel@...gen.mpg.de> wrote:
> Sorry for writing you directory, but I saw you created the module
> *string_selftest* in commit d6b28e09 (lib: add module support to string
> tests).
>
> I believe, I only did `make olddefconfig`, and the option is selected.
>
> ```
> $ grep STRING_SELFTEST .config
> CONFIG_STRING_SELFTEST=y
> ```
>
> But booting with `initcall_debug` and looking at the systemd-bootchart
> output in `/run/log`, doing this lasts 600 ms on my ASRock E350M1 with Linux
> 4.16-rc5 (probably since the 4.15 cycle).
>
>> string_selftest_init 636.2ms
>
> If I didn’t do anything incorrectly, should the module be disable by
> default?

lib/Kconfig:

    config STRING_SELFTEST
            tristate "Test string functions"

In the absence of any "default" statement, the default is "n", so the module
should be already disabled by default.

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds