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

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Message-ID: <4CEC33F6.9090808@zytor.com>
Date:	Tue, 23 Nov 2010 13:36:54 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Jason Baron <jbaron@...hat.com>
CC:	rostedt@...dmis.org, 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 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.

	-hpa
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