linux-kernel - Re: [patch V2 3/7] futex: Add op for hash preallocation

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Message-ID: <20160520045056.GZ3193@twins.programming.kicks-ass.net>
Date:	Fri, 20 May 2016 06:50:56 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Darren Hart <dvhart@...radead.org>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	LKML <linux-kernel@...r.kernel.org>,
	Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Darren Hart <darren@...art.com>,
	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: Re: [patch V2 3/7] futex: Add op for hash preallocation

On Thu, May 19, 2016 at 12:38:19PM -0700, Darren Hart wrote:
> On Thu, May 19, 2016 at 02:24:57PM +0200, Peter Zijlstra wrote:
> > OK, so no on-line rehashing possible?
> 
> It doesn't do it currently... did you see something that makes it impossible to
> add?

No, just tons of tricky.