From mboxrd@z Thu Jan  1 00:00:00 1970
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Date: Sat, 15 Apr 2006 18:02:07 +0200
From: Jan Kiszka <jan.kiszka@domain.hid>
MIME-Version: 1.0
Subject: Re: [Xenomai-core] [PATCH] detect problematic kernel configs
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To: Gilles Chanteperdrix <gilles.chanteperdrix@xenomai.org>
Cc: xenomai-core <xenomai@xenomai.org>

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Gilles Chanteperdrix wrote:
> Jan Kiszka wrote:
>  > Hi,
>  >=20
>  > this patch tries to reduce the traps newbies may tap by leaving (for=
 us)
>  > well-known problematic kernel switches on. And are there any futher =
I
>  > forgot, e.g. on other archs?
>  >=20
>  > Jan
>  > Index: ksrc/arch/i386/Kconfig
>  > =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
>  > --- ksrc/arch/i386/Kconfig	(revision 924)
>  > +++ ksrc/arch/i386/Kconfig	(working copy)
>  > @@ -194,3 +194,19 @@ depends on XENO_OPT_NUCLEUS
>  >  source "drivers/xenomai/Kconfig"
>  > =20
>  >  endmenu
>  > +
>  > +if XENOMAI =3D y
>  > +
>  > +comment "WARNING: Potential latency killers detected!"
>  > +        depends on PM || ACPI || CPU_FREQ
>  > +
>  > +comment "Power Management (PM)"
>  > +        depends on PM
>  > +
>  > +comment "ACPI"
>  > +        depends on ACPI
>=20
> Only ACPI_PROCESSOR is a latency killer.
>=20

Good point. Are there also some more fine-grained switches under
CONFIG_PM? Never tried this in details, always picked the safe way.

Jan


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