linux-kernel - Re: [PATCH 2/2] Markers Implementation for Preempt RCU Boost Tracing

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Date:	Wed, 2 Jan 2008 21:10:32 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	"Frank Ch. Eigler" <fche@...hat.com>
Cc:	"K. Prasad" <prasad@...ux.vnet.ibm.com>,
	linux-kernel@...r.kernel.org, linux-rt-users@...r.kernel.org,
	dipankar@...ibm.com, ego@...ibm.com, mathieu.desnoyers@...ymtl.ca,
	paulmck@...ux.vnet.ibm.com,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [PATCH 2/2] Markers Implementation for Preempt RCU Boost
	Tracing


* Frank Ch. Eigler <fche@...hat.com> wrote:

> Hi -
> 
> On Wed, Jan 02, 2008 at 06:01:57PM +0100, Ingo Molnar wrote:
> > [...]
> > well, -freorder-blocks seems to be default-enabled at -O2 on gcc 4.2, so 
> > we should already be getting that, right?
> 
> Right.
> 
> > [...]  So it would be nice if we could collect all this offline code
> > and stuff it away into another portion of the kernel image. (or,
> > into another portion of the object file - which would still be good
> > enough in practice)
> 
> That would be the -freorder-blocks-and-partition flag, as proposed by 
> Arjan two Februarys ago.  I don't see any traces of Andi's overriding 
> "-fno-reorder-blocks" in the current linus tree, so maybe it's time to 
> resurrect this one:
> 
> http://readlist.com/lists/vger.kernel.org/linux-kernel/39/196123.html

hm, that gives:

                                   Forbidden

   You don't have permission to access
   /lists/vger.kernel.org/linux-kernel/39/196123.html on this server.

but yeah, i had the impression that gcc couldnt yet do this. Not a 
showstopper, but it would be nice to initiate the gcc side of things ...

	Ingo
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