linux-kernel - Re: [Futex RFC] was Re: [BUG FIX] Make x86

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Message-Id: <200905282100.03577.lkml@morethan.org>
Date:	Thu, 28 May 2009 21:00:01 -0500
From:	"Michael S. Zick" <lkml@...ethan.org>
To:	Pavel Machek <pavel@....cz>
Cc:	"H. Peter Anvin" <hpa@...or.com>,
	Harald Welte <HaraldWelte@...tech.com>,
	Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>,
	linux-kernel@...r.kernel.org, Alan Cox <alan@...rguk.ukuu.org.uk>
Subject: Re: [Futex RFC] was Re: [BUG FIX] Make x86_32 uni-processor Atomic ops, Atomic

On Thu May 28 2009, Michael S. Zick wrote:
> 
> Please, somebody apply an experienced eye-ball to this;
> It does seem to make a difference, but tests have not run
> for very long yet.
> 
> diff --git a/arch/x86/include/asm/futex.h b/arch/x86/include/asm/futex.h
> index 1f11ce4..da3c801 100644
> --- a/arch/x86/include/asm/futex.h
> +++ b/arch/x86/include/asm/futex.h
> @@ -19,7 +19,8 @@
>                      "\t.previous\n"                            \
>                      _ASM_EXTABLE(1b, 3b)                       \
>                      : "=r" (oldval), "=r" (ret), "+m" (*uaddr) \
> -                    : "i" (-EFAULT), "0" (oparg), "1" (0))
> +                    : "i" (-EFAULT), "0" (oparg), "1" (0)      \
> +                    : "memory")
> 
>  #define __futex_atomic_op2(insn, ret, oldval, uaddr, oparg)    \
>         asm volatile("1:\tmovl  %2, %0\n"                       \
> @@ -35,7 +36,8 @@
>                      _ASM_EXTABLE(2b, 4b)                       \
>                      : "=&a" (oldval), "=&r" (ret),             \
>                        "+m" (*uaddr), "=&r" (tem)               \
> -                    : "r" (oparg), "i" (-EFAULT), "1" (0))
> +                    : "r" (oparg), "i" (-EFAULT), "1" (0)      \
> +                    : "memory")
> 
> 
> Mike

Without the above annotations: C7-M/CX700 uptime while running 
pulse-audio: 1 1/2 hrs.

With the above annotations: C7-M/CX700 uptime, same test setup,
maximum unknown, test terminated after 3 hours.

On the C7-M/CN896 - maximum unknown, test terminated after 12 hrs.

Sample build to be available tomorrow.

Mike
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