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

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Message-ID: <1340852306.16702.74.camel@gandalf.stny.rr.com>
Date:	Wed, 27 Jun 2012 22:58:26 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Dave Jones <davej@...hat.com>
Cc:	Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: big allocation failure during tracing init.

On Wed, 2012-06-27 at 22:22 -0400, Dave Jones wrote:
> 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.

You probably need to do some tracing to trigger it. As it requires
opening of the trace files.

-- Steve


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