linux-kernel - [PATCH -mm take2] 64bit-futex - provide new commands instead of new syscall

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Date:	Tue, 24 Apr 2007 10:07:23 +0200
From:	Pierre Peiffer <pierre.peiffer@...l.net>
To:	Ulrich Drepper <drepper@...il.com>
Cc:	Jakub Jelinek <jakub@...hat.com>, akpm@...ux-foundation.org,
	mingo@...e.hu, drepper@...hat.com, linux-kernel@...r.kernel.org,
	jean-pierre.dion@...l.net
Subject: [PATCH -mm take2] 64bit-futex - provide new commands instead of new
 syscall

Ulrich Drepper a écrit :
> 
> It looks mostly good.  I wouldn't use the high bit to differentiate
> the 64-bit operations, though.  Since we do not allow to apply it to
> all operations the only effect will be that the compiler has a harder
> time generating the code for the switch statement.  If you use
> continuous values a simple jump table can be used and no conditionals.
> Smaller and faster.
> 

Something like that may be...

Signed-off-by: Pierre Peiffer <pierre.peiffer@...l.net>


-- 
Pierre

View attachment "futex-64bits-command.patch" of type "text/x-patch" (22912 bytes)