From: Thomas Gleixner <tglx@linutronix.de>
To: LKML <linux-kernel@vger.kernel.org>
Cc: Sebastian Andrzej Siewior <bigeasy@linutronix.de>,
Darren Hart <darren@dvhart.com>,
Peter Zijlstra <peterz@infradead.org>,
Ingo Molnar <mingo@kernel.org>,
Michael Kerrisk <mtk.manpages@googlemail.com>,
Davidlohr Bueso <dave@stgolabs.net>, Chris Mason <clm@fb.com>,
"Carlos O'Donell" <carlos@redhat.com>,
Torvald Riegel <triegel@redhat.com>,
Eric Dumazet <edumazet@google.com>
Subject: [RFC patch 0/7] futex: Add support for attached futexes
Date: Sat, 02 Apr 2016 11:09:15 -0000 [thread overview]
Message-ID: <20160402095108.894519835@linutronix.de> (raw)
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
next reply other threads:[~2016-04-02 11:11 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-04-02 11:09 Thomas Gleixner [this message]
2016-04-02 11:09 ` [RFC patch 1/7] futex: Provide helpers for hash bucket add/remove Thomas Gleixner
2016-04-02 11:09 ` [RFC patch 2/7] futex: Add some more function commentry Thomas Gleixner
2016-04-02 11:09 ` [RFC patch 3/7] futex: Make key init a helper function Thomas Gleixner
2016-04-02 11:09 ` [RFC patch 4/7] futex: Add support for attached futexes Thomas Gleixner
2016-04-02 16:26 ` Peter Zijlstra
2016-04-02 18:01 ` Thomas Gleixner
2016-04-02 16:29 ` Peter Zijlstra
2016-04-03 9:59 ` Thomas Gleixner
2016-04-02 18:19 ` Andy Lutomirski
2016-04-03 9:57 ` Thomas Gleixner
2016-04-03 13:18 ` Andy Lutomirski
2016-04-03 15:56 ` Thomas Gleixner
2016-04-03 16:11 ` Andy Lutomirski
2016-04-02 23:48 ` Rasmus Villemoes
2016-04-03 10:05 ` Thomas Gleixner
2016-04-03 11:16 ` Ingo Molnar
2016-04-03 11:30 ` Linus Torvalds
2016-04-05 7:44 ` Torvald Riegel
2016-04-05 15:58 ` Carlos O'Donell
2016-04-02 11:09 ` [RFC patch 5/7] perf/bench/futex-hash: Support " Thomas Gleixner
2016-04-02 11:09 ` [RFC patch 6/7] futex.2: Document attached mode Thomas Gleixner
2016-04-02 11:09 ` [RFC patch 7/7] [PATCH] glibc: nptl: Add support for attached pthread_mutexes Thomas Gleixner
2016-04-02 16:30 ` Peter Zijlstra
2016-04-02 16:32 ` Peter Zijlstra
2016-04-03 10:08 ` Thomas Gleixner
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