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

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Message-ID: <46F12ED7.3060605@us.ibm.com>
Date:	Wed, 19 Sep 2007 07:14:47 -0700
From:	David Wilder <dwilder@...ibm.com>
To:	Andi Kleen <andi@...stfloor.org>
CC:	linux-kernel@...r.kernel.org, akpm@...ux-foundation.org
Subject: Re: [Patch 1/2] Trace code and documentation (updated)

Andi Kleen wrote:
> "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.

I agree with you; however, this is in the example code in the 
Documentation directory,  It is not part of the trace code.  The example 
was just meant to be a demonstration of how the interface works.
> 
> -Andi
> 

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