linux-kernel - Re: [Patch 1/2] Trace code and documentation (updated)

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Message-ID: <p736427vz00.fsf@bingen.suse.de>
Date:	19 Sep 2007 10:30:07 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	"David J. Wilder" <dwilder@...ibm.com>
Cc:	linux-kernel@...r.kernel.org, akpm@...ux-foundation.org
Subject: Re: [Patch 1/2] Trace code and documentation (updated)

"David J. Wilder" <dwilder@...ibm.com> writes:

Not having read the whole thing; just something I noticed.

Gut feeling is that you have too many knobs and options and 
some overengineering though -- simplifying it would be a good thing.

> +
> +#define TRACE_PRINTF_TMPBUF_SIZE (1024)
> +static char trace_tmpbuf[NR_CPUS][TRACE_PRINTF_TMPBUF_SIZE];

That definitely needs to be a per CPU variable. Imagine
what happens on a NR_CPUS==4096 kernel.  In general when 
you have a NR_CPUS indexed array you're likely doing something
wrong. Yes there are still places in the main tree who do that,
but most of them need to be fixed.

-Andi
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