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

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Message-ID: <20090312104721.GA6005@shamino.rdu.redhat.com>
Date:	Thu, 12 Mar 2009 06:47:21 -0400
From:	Neil Horman <nhorman@...hat.com>
To:	Pierre Ossman <drzeus@...eus.cx>
Cc:	Steven Rostedt <rostedt@...dmis.org>, linux-kernel@...r.kernel.org,
	Ingo Molnar <mingo@...e.hu>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Wu Fengguang <fengguang.wu@...el.com>,
	Pekka Paalanen <pq@....fi>
Subject: Re: [PATCH 0/4] [GIT PULL] memory saving ring buffer for
	tip/tracing/ftrace

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@...dmis.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


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