linux-kernel - Re: [PATCH] Increase MAX_STACK_TRACE

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Date:	Tue, 22 Sep 2009 13:29:22 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	John Kacur <jkacur@...hat.com>
Cc:	mingo@...e.hu, tglx@...uxtronix.de, linux-kernel@...r.kernel.org,
	Clark Williams <williams@...hat.com>
Subject: Re: [PATCH] Increase MAX_STACK_TRACE_ENTRIES

On Mon, 2009-09-21 at 19:13 +0200, John Kacur wrote:
> Ingo: please consider this patch if there are no negative consequences to 
> increasing this value. It fixes a problem that we have seen in the past on
> (at least) the real-time kernel. (BUG: MAX_STACK_TRACE_ENTRIES).
> 
> This patch applies to the current tip/master

Hrmm,.. this is growing to be very large indeed.

It would be nice to know where all these extra entries are coming from.
How large are:

# cat /proc/lockdep | grep -v -e "\->" -e "^$" | wc -l
437

# cat /proc/lockdep | grep -v -e "\->" -e "^$" | awk '{print $6}' | 
                      tr -d ".:" | grep -v "^$" | wc -c
1031

On your machine?

> -#define MAX_STACK_TRACE_ENTRIES	262144UL
> +#define MAX_STACK_TRACE_ENTRIES	393216UL

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