linux-kernel - Re: big allocation failure during tracing init.

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Message-ID: <20120628022218.GA30698@redhat.com>
Date:	Wed, 27 Jun 2012 22:22:18 -0400
From:	Dave Jones <davej@...hat.com>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: big allocation failure during tracing init.

On Wed, Jun 27, 2012 at 08:52:43PM -0400, Steven Rostedt wrote:
 > On Fri, 2012-06-22 at 15:36 -0400, Dave Jones wrote:
 > 
 > > I guess the problem is on kernels built with CONFIG_MAXCPUS, struct trace_iterator
 > > can be pretty large due to this embedded in it..
 > > 
 > > 	struct ring_buffer_iter *buffer_iter[NR_CPUS];
 > > 
 > > Any thoughts on how to change that to a smaller dynamic data structure,
 > > without adding too much overhead to tracing ? (I'm assuming a linked-list walk
 > > for eg would be excessive?)
 > > 
 > 
 > Does this patch fix it for you?

I'm not sure what I did to trigger the allocation failure last time,
but I'll run with this for a while, and see if anything falls out.

thanks!

	Dave
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