linux-kernel - Re: [PATCH 0/3] jump label: updates for 2.6.37

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Message-ID: <1290553914.30543.408.camel@gandalf.stny.rr.com>
Date:	Tue, 23 Nov 2010 18:11:54 -0500
From:	Steven Rostedt <rostedt@...dmis.org>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Jason Baron <jbaron@...hat.com>, mingo@...e.hu,
	peterz@...radead.org, mathieu.desnoyers@...ymtl.ca,
	tglx@...utronix.de, andi@...stfloor.org, roland@...hat.com,
	rth@...hat.com, masami.hiramatsu.pt@...achi.com,
	fweisbec@...il.com, avi@...hat.com, davem@...emloft.net,
	sam@...nborg.org, ddaney@...iumnetworks.com,
	michael@...erman.id.au, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/3] jump label: updates for 2.6.37

On Tue, 2010-11-23 at 13:36 -0800, H. Peter Anvin wrote:
> On 11/23/2010 01:27 PM, Jason Baron wrote:
> > Hi,
> > 
> > A few jump label patches that I want considered for 2.6.37. Patches are against
> > the latest -tip tree.
> > 
> > The first one, which adds 'state' to the jump label mechanism is the most
> > important. Essentially, it ensures that if jump labels are enabled/disabled in
> > the core kernel but the actual call sites are in modules, we properly honor the
> > state of the jump label. This also works for jump labels which may be defined in
> > one module but made use of in another module.
> > 
> > There has been some discussion about using the 'key' variable to store the
> > enabled/disabled state for each jump label. However, I think a better design
> > will be to use the 'key' variable to store a pointer to the appropriate jump
> > label tables. In this way, we can enable/disable jump labels, without the
> > hashing that I'm currently doing. However, I didn't want to propose these more
> > invasive changes until 2.6.38. 
> > 
> 
> I would also like to see a change in the API, preferrably something
> closer to the "SWITCH_POINT" interface I discussed with Stephen before
> Kernel Summit.
> 

Could you explain in more detail what you would like to see.

Thanks,

-- Steve


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