linux-kernel - [RFC patch 0/7] futex: Add support for attached futexes

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Date:	Sat, 02 Apr 2016 11:09:15 -0000
From:	Thomas Gleixner <tglx@...utronix.de>
To:	LKML <linux-kernel@...r.kernel.org>
Cc:	Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
	Darren Hart <darren@...art.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...nel.org>,
	Michael Kerrisk <mtk.manpages@...glemail.com>,
	Davidlohr Bueso <dave@...olabs.net>, Chris Mason <clm@...com>,
	Carlos O'Donell <carlos@...hat.com>,
	Torvald Riegel <triegel@...hat.com>,
	Eric Dumazet <edumazet@...gle.com>
Subject: [RFC patch 0/7] futex: Add support for attached futexes

The standard futex mechanism in the Linux kernel uses a global hash to store
transient state. Collisions on that hash can lead to performance degradation
and on real-time enabled kernels to unbound priority inversions.

To guarantee futexes without collisions on the global kernel hash, we provide
a mechanism to attach to a futex. This creates futex private state which
avoids hash collisions and on NUMA systems also cross node memory accesses.

The full explanation of the mechanism is in the changelog of 
patch 4/7 'futex: Add support for attached futexes'.

The last two patches in the series contain a first update to the futex man
page and initial glibc support.

For your conveniance the kernel part is available at:

git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git WIP.futex

Thanks,

	tglx