From mboxrd@z Thu Jan  1 00:00:00 1970
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Date: Sat, 23 Feb 2008 13:35:12 +0100
From: Jan Kiszka <jan.kiszka@domain.hid>
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Subject: Re: [Adeos-main] [PATCH] tracer: use per-cpu trace buffers
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To: Gilles Chanteperdrix <gilles.chanteperdrix@xenomai.org>
Cc: Jan Kiszka <jan.kiszka@domain.hid>, adeos-main <adeos-main@gna.org>, Philippe Gerum <rpm@xenomai.org>

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Gilles Chanteperdrix wrote:
> Jan Kiszka wrote:
>  > This patch addresses two issues:
>  >=20
>  >  - fixes boot hang with CONFIG_IPIPE_TRACE, !CONFIG_IPIPE_TRACE_VMAL=
LOC,
>  >    and large CONFIG_NR_CPUS (due to the huge trace buffers this impl=
ies,
>  >    even if the system has only a few CPUs in fact)
>=20
> This is something I observed even on UP systems: the kernel does not
> boot on ARM if CONFIG_IPIPE_TRACE_VMALLOC is not selected.
>=20

Yeah, well known, that's why we have vmalloc'ed trace buffers.

I just wondered again if this is an arch-specific issue, or if it
depends on the RAM size. If it is arch-specific, you are welcome to
change the default of IPIPE_TRACE_VMALLOC ("default y if ARM || ...").
Or reduce IPIPE_TRACE_SHIFT for ARM, given there is a reasonable value
(/wrt to the tracer) your boards still boot with.

Jan


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