linux-kernel - Re: [RFC patch 0/5] futex: Allow lockless empty check of hashbucket plist in futex

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Message-ID: <1386093564.5377.55.camel@dvhart-mobl4.amr.corp.intel.com>
Date:	Tue, 03 Dec 2013 09:59:24 -0800
From:	Darren Hart <dvhart@...ux.intel.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Eric Dumazet <eric.dumazet@...il.com>,
	Ingo Molnar <mingo@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Davidlohr Bueso <davidlohr@...com>,
	Thomas Gleixner <tglx@...utronix.de>,
	LKML <linux-kernel@...r.kernel.org>,
	Jason Low <jason.low2@...com>, Mike Galbraith <efault@....de>,
	Jeff Mahoney <jeffm@...e.com>,
	Scott Norton <scott.norton@...com>,
	Tom Vaden <tom.vaden@...com>,
	Aswin Chandramouleeswaran <aswin@...com>,
	Waiman Long <Waiman.Long@...com>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [RFC patch 0/5] futex: Allow lockless empty check of hashbucket
 plist in futex_wake()

On Sun, 2013-12-01 at 13:46 -0800, Linus Torvalds wrote:
> On Sun, Dec 1, 2013 at 12:39 PM, Eric Dumazet <eric.dumazet@...il.com> wrote:
> >
> > Last time I checked, private futexes were used when appropriate.
> >
> > "strace -e futex" mainly show _PRIVATE uses.
> 
> Yeah, pthread mutexes seem to do it.

Yes, the default was changed to _PRIVATE for pthreads in glibc several
years back (2007 iirc). The performance benefits were significant.

-- 
Darren Hart
Intel Open Source Technology Center
Yocto Project - Linux Kernel


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