linux-kernel - [PATCH 0/2] Per-task wait_queue

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Message-Id: <1402403359-6023-1-git-send-email-linux@rasmusvillemoes.dk>
Date:	Tue, 10 Jun 2014 14:29:17 +0200
From:	Rasmus Villemoes <linux@...musvillemoes.dk>
To:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Ingo Molnar <mingo@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Oleg Nesterov <oleg@...hat.com>,
	Rik van Riel <riel@...hat.com>,
	David Rientjes <rientjes@...gle.com>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Davidlohr Bueso <davidlohr@...com>,
	Michal Simek <michal.simek@...inx.com>
Cc:	linux-kernel@...r.kernel.org,
	Rasmus Villemoes <linux@...musvillemoes.dk>
Subject: [PATCH 0/2] Per-task wait_queue_t

This is an attempt to reduce the stack footprint of various functions
(those using any of the wait_event_* macros), by removing the need to
allocate a wait_queue_t on the stack and instead use a single instance
embedded in task_struct. I'm not really sure where the best place to
put it is; I just placed it next to other list bookkeeping fields.

For now, there is a little unconditional debugging. This could later
be removed or maybe be made dependent on some CONFIG_* variable. The
idea of using ->flags is taken from Pavel [1] (I originally stored
(void*)1 into ->private).

Compiles, but not actually tested.

[1] http://thread.gmane.org/gmane.linux.kernel/1720670

Rasmus Villemoes (2):
  wait: Introduce per-task wait_queue_t
  wait: Use the per-task wait_queue_t in ___wait_event macro

 include/linux/sched.h | 23 +++++++++++++++++++++++
 include/linux/wait.h  | 18 ++++++++++--------
 kernel/fork.c         |  1 +
 3 files changed, 34 insertions(+), 8 deletions(-)

-- 
1.9.2

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