linux-kernel - [PATCH/RFC 0/2] jump label: simplify API

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Date:	Thu, 16 Dec 2010 13:25:11 -0500
From:	Jason Baron <jbaron@...hat.com>
To:	peterz@...radead.org, hpa@...or.com, rostedt@...dmis.org,
	mingo@...e.hu
Cc:	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: [PATCH/RFC 0/2] jump label: simplify API

Hi,

The first patch uses the storage space of the jump label key address
as a pointer into the update table. In this way, we can find all
the addresses that need to be updated without hashing.

The second patch introduces:

static __always_inline bool unlikely_switch(struct jump_label_key *key);

instead of the old JUMP_LABEL(key, label) macro.

In this way, jump labels become really easy to use:

Define:

	struct jump_label_key jump_key;

Can be used as:

	if (unlikely_switch(&jump_key))
		do unlikely code

enable/disale via:

	jump_label_enable(&jump_key);
	jump_label_disable(&jump_key);

that's it!

Thanks to H. Peter Anvin for suggesting the simpler 'unlikely_switch()'
function.

thanks,

-Jason


Jason Baron (2):
  jump label: make enable/disable o(1)
  jump label: introduce unlikely_switch()

 arch/x86/include/asm/jump_label.h |   22 +++--
 arch/x86/kernel/jump_label.c      |    2 +-
 include/linux/dynamic_debug.h     |   24 ++----
 include/linux/jump_label.h        |   72 ++++++++++-------
 include/linux/jump_label_ref.h    |   41 ++++++----
 include/linux/perf_event.h        |   25 +++---
 include/linux/tracepoint.h        |    8 +-
 kernel/jump_label.c               |  159 ++++++++++++++++++++++++++++++-------
 kernel/perf_event.c               |    4 +-
 kernel/tracepoint.c               |   22 ++---
 10 files changed, 243 insertions(+), 136 deletions(-)

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