Re: [PATCH 0/4] [GIT PULL] memory saving ring buffer for tip/tracing/ftrace

[Neil Horman <nhorman@redhat.com>]

On Thu, Mar 12, 2009 at 08:07:58AM +0100, Pierre Ossman wrote:
> On Wed, 11 Mar 2009 22:37:20 -0400
> Steven Rostedt <rostedt@goodmis.org> wrote:
> 
> > Ingo,
> > 
> > This patch series implements a better memory management by the
> > ring buffer. It only allocates the buffers for the online CPUS, as well
> > as keeps the buffers to a minimum size until they are used.
> > 
> > Please pull the latest tip/tracing/ftrace tree, which can be found at:
> > 
> >   git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-2.6-trace.git
> > tip/tracing/ftrace
> > 
> > 
> > Steven Rostedt (4):
> >       tracing: keep ring buffer to minimum size till used
> >       tracing: expand the ring buffers when an event is activated
> >       tracing: fix trace_wait to know to wait on all cpus or just one
> >       ring-buffer: only allocate buffers for online cpus
> > 
> 
> How difficult is it to apply this to 2.6.27? Fedora is still on that
> kernel and it would be nice if I could get my memory back on a
> distribution kernel. :)

I'm looking into it currently.  I'll post a test kernel when I have something
for you.
Neil