linux-kernel - Re: [PATCH -v7][RFC]: mutex: implement adaptive spinning

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Date:	Fri, 09 Jan 2009 14:25:18 -0800
From:	Harvey Harrison <harvey.harrison@...il.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Ingo Molnar <mingo@...e.hu>, "H. Peter Anvin" <hpa@...or.com>,
	Andi Kleen <andi@...stfloor.org>,
	Chris Mason <chris.mason@...cle.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	paulmck@...ux.vnet.ibm.com, Gregory Haskins <ghaskins@...ell.com>,
	Matthew Wilcox <matthew@....cx>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	linux-fsdevel <linux-fsdevel@...r.kernel.org>,
	linux-btrfs <linux-btrfs@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Nick Piggin <npiggin@...e.de>,
	Peter Morreale <pmorreale@...ell.com>,
	Sven Dietrich <SDietrich@...ell.com>
Subject: Re: [PATCH -v7][RFC]: mutex: implement adaptive spinning

On Fri, 2009-01-09 at 14:09 -0800, Linus Torvalds wrote:
> Actually, the nice part about "inline_hint" would be that then we could 
> have some nice config option like
> 
>   #ifdef CONFIG_FULL_CALL_TRACE
>    #define inline_hint noinline
>   #elif defined(CONFIG_TRUST_COMPILER)
>    #define inline_hint /* */
>   #else
>    #define inline_hint __inline
>   #endif
> 
> and now the _only_ thing we need to do is to remove the
> 
> 	#define __inline	__force_inline
> 
> thing, and just agree that "__inline" is the "native compiler meaning". 
> 
> We have a few users of "__inline", but not very many. We can leave them 
> alone, or just convert them to __inline__ or inline.
> 

Oh yeah, and figure out what actually breaks on alpha such that they added
the following (arch/alpha/include/asm/compiler.h)

#ifdef __KERNEL__
/* Some idiots over in <linux/compiler.h> thought inline should imply
   always_inline.  This breaks stuff.  We'll include this file whenever
   we run into such problems.  */

#include <linux/compiler.h>
#undef inline
#undef __inline__
#undef __inline
#undef __always_inline
#define __always_inline		inline __attribute__((always_inline))

#endif /* __KERNEL__ */

Cheers,

Harvey

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