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From: Nick Piggin <nickpiggin@yahoo.com.au>
To: Ingo Molnar <mingo@elte.hu>
Subject: Re: sched_yield: delete sysctl_sched_compat_yield
Date: Mon, 3 Dec 2007 15:27:56 +1100
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Cc: "Zhang, Yanmin" <yanmin_zhang@linux.intel.com>,
       Arjan van de Ven <arjan@infradead.org>,
       Andrew Morton <akpm@linux-foundation.org>,
       LKML <linux-kernel@vger.kernel.org>
References: <1196155985.25646.31.camel@ymzhang> <200711301429.15664.nickpiggin@yahoo.com.au> <20071130100845.GB2201@elte.hu>
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On Friday 30 November 2007 21:08, Ingo Molnar wrote:
> * Nick Piggin <nickpiggin@yahoo.com.au> wrote:
> > Haven't we been asking JVMs to use futexes or posix locking for years
> > and years now? [...]
>
> i'm curious, with what JVM was it tested and where's the source so i can
> fix their locking for them? Can the problem be reproduced with:

Sure, but why shouldn't the compat behaviour be the default, and the
sysctl go away?

It makes older JVMs work better, it is slightly closer to the old
behaviour, and it is arguably a less surprising result.

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