linux-kernel - Re: 2.6.21-rc3-mm1 RSDL results

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Message-ID: <87irdasnz4.fsf@depni.sinp.msu.ru>
Date:	Fri, 09 Mar 2007 13:36:15 +0300
From:	Serge Belyshev <belyshev@...ni.sinp.msu.ru>
To:	William Lee Irwin III <wli@...omorphy.com>
Cc:	Matt Mackall <mpm@...enic.com>, Con Kolivas <kernel@...ivas.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	akpm@...ux-foundation.org
Subject: Re: 2.6.21-rc3-mm1 RSDL results

William Lee Irwin III <wli@...omorphy.com> writes:

> On Fri, Mar 09, 2007 at 12:07:06PM +0300, Serge Belyshev wrote:
>> If you see sched_yield() when stracing any 3d program, I suggest you
>> to try this bruteforce workaround, which works fine for me,
>> disable sched_yield():
>
> May I suggest LD_PRELOAD of a library consisting of only a nopped
> sched_yield() function in userspace?
>

Sure. This is definitely clearer way to do. You just need to put
export LD_PRELOAD=/path/to/your/lib.so somewhere early enough.

cat > yield.c << EOF
int sched_yield (void)
{
	return 0;
}
EOF
gcc yield.c -o yield.so -shared -O2 -fPIC -g
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