linux-kernel - [PATCH 0/4][RFC] jump label: introduce default true branch

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Date:	Wed, 21 Dec 2011 14:09:01 -0500
From:	Jason Baron <jbaron@...hat.com>
To:	a.p.zijlstra@...llo.nl
Cc:	rostedt@...dmis.org, mathieu.desnoyers@...icios.com, hpa@...or.com,
	mingo@...e.hu, davem@...emloft.net, ddaney.cavm@...il.com,
	pjt@...gle.com, rth@...hat.com, linux-kernel@...r.kernel.org
Subject: [PATCH 0/4][RFC] jump label: introduce default true branch

Hi Peter,

I've introduced a new static_branch_def_true() construct, such that the straight
line path is the true branch, and we patch a jump to get to the false branch.
In order to make jump_label_inc()/dec() work as 'make true'/'make false' with
counting, I've had to update some of the core jump label code. This patchset also
introduces: JUMP_LABEL_INIT_TRUE/FALSE, so that keys should be initialized as:

struct jump_label_key true_key = JUMP_LABEL_INIT_TRUE;

           or

struct jump_label_key false_key = JUMP_LABEL_INIT_FALSE;

I think this patch series should address the issues that came up with sched_feat()
implementation.

Thanks,

-Jason

Jason Baron (4):
  jump label: Introduce default true branch + API update
  perf: Make use of updated jump label API.
  tracepoints: update to use new jump label API.
  sched: Make use of new jump label API.

 include/linux/jump_label.h |   77 ++++++++++++++++++++++++++++++++++++-------
 include/linux/perf_event.h |    6 ++--
 include/linux/tracepoint.h |    4 +-
 kernel/jump_label.c        |   66 +++++++++++++++++++++++++------------
 kernel/sched/core.c        |   12 +++---
 kernel/sched/fair.c        |    2 +-
 kernel/sched/sched.h       |   11 +------
 kernel/tracepoint.c        |   12 +++---
 8 files changed, 128 insertions(+), 62 deletions(-)

-- 
1.7.7.3

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