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From: Adrian Bunk <bunk@kernel.org>
To: Andi Kleen <andi@firstfloor.org>
Cc: Andrew Morton <akpm@linux-foundation.org>,
	Kyle McMartin <kyle@mcmartin.ca>,
	linux-kernel@vger.kernel.org, linux-arch@vger.kernel.org
Subject: Re: RFC: remove __read_mostly
Date: Mon, 17 Dec 2007 13:40:23 +0100	[thread overview]
Message-ID: <20071217124023.GB30389@stusta.de> (raw)
In-Reply-To: <20071217121556.GA31999@one.firstfloor.org>

On Mon, Dec 17, 2007 at 01:15:56PM +0100, Andi Kleen wrote:
> > So...  once we've moved all read-mostly variables into __read_mostly, what
> > is left behind in bss?
> 
> I had already covered that in the next paragraph which you conveniently
> snipped :)
> 
> Anyways I suspect the right solution for that would be more classes
> of variables for even better grouping.
>...

Is there any way to tell gcc that it's still allowed to omit the 
variable when it's able to prove it's read-only?

My basic fear with all the __read_mostly, immediate values,... stuff is 
that it might interfere with gcc optimizations.

> -Andi

cu
Adrian

-- 

       "Is there not promise of rain?" Ling Tan asked suddenly out
        of the darkness. There had been need of rain for many days.
       "Only a promise," Lao Er said.
                                       Pearl S. Buck - Dragon Seed


  reply	other threads:[~2007-12-17 12:40 UTC|newest]

Thread overview: 21+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2007-12-13 22:20 RFC: remove __read_mostly Adrian Bunk
2007-12-13 22:29 ` Andi Kleen
2007-12-13 22:41   ` Adrian Bunk
2007-12-14 16:16     ` Arnd Bergmann
2007-12-14 16:31       ` Eric Dumazet
2007-12-13 22:32 ` David Miller
2007-12-13 22:44   ` Harvey Harrison
2007-12-13 23:06     ` Andi Kleen
2007-12-13 22:48 ` Eric Dumazet
2007-12-13 23:00   ` Adrian Bunk
2007-12-13 23:54 ` Kyle McMartin
2007-12-14  0:33   ` Andi Kleen
2007-12-17 10:33     ` Andrew Morton
2007-12-17 10:53       ` Eric Dumazet
2007-12-17 11:07         ` Andrew Morton
2007-12-17 12:19           ` Andi Kleen
2007-12-17 12:15       ` Andi Kleen
2007-12-17 12:40         ` Adrian Bunk [this message]
2007-12-14 15:24 ` Matt Mackall
2007-12-14 15:38   ` Eric Dumazet
2007-12-14 15:42     ` Matt Mackall

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