linux-kernel - Re: [PATCH, take4] FUTEX : new PRIVATE futexes

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Date:	Sat, 07 Apr 2007 19:30:14 +1000
From:	Nick Piggin <nickpiggin@...oo.com.au>
To:	Eric Dumazet <dada1@...mosbay.com>
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	Dave Jones <davej@...hat.com>,
	Ulrich Drepper <drepper@...il.com>,
	Ingo Molnar <mingo@...e.hu>, Andi Kleen <ak@...e.de>,
	Ravikiran G Thirumalai <kiran@...lex86.org>,
	"Shai Fultheim (Shai@...lex86.org)" <shai@...lex86.org>,
	pravin b shelar <pravin.shelar@...softinc.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH, take4] FUTEX : new PRIVATE futexes

Eric Dumazet wrote:
> Hi all
> 
> Updates on this take4 :
> 
> - All remarks from Nick were addressed I hope

Yeah looks very nice. Thanks for doing that.

> 
> - Current mm code have a problem with 64bit futexes, as spoted by Nick :
> 
> get_futex_key() does a check against sizeof(u32) regardless of futex being 64bits or not.
> So it is possible a 64bit futex spans two pages of memory...
> I had to change get_futex_key() prototype to be able to do a correct test.

I wonder if it should be encfocing alignment to keep in on 1 page?

Otherwise,
Acked-by: Nick Piggin <npiggin@...e.de>

I'll be away for a couple of days, but I'll look at running some performance
tests when I get back.

Thanks,
Nick

-- 
SUSE Labs, Novell Inc.
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