From: Richard Henderson <rth@twiddle.net>
To: Al Viro <viro@ftp.linux.org.uk>
Cc: Linus Torvalds <torvalds@osdl.org>,
Roman Zippel <zippel@linux-m68k.org>,
Willy Tarreau <willy@w.ods.org>, Robert Love <rml@novell.com>,
Russell King <rmk+lkml@arm.linux.org.uk>,
Linux Kernel List <linux-kernel@vger.kernel.org>
Subject: Re: p = kmalloc(sizeof(*p), )
Date: Mon, 19 Sep 2005 23:31:58 -0700 [thread overview]
Message-ID: <20050920063158.GA3171@twiddle.net> (raw)
In-Reply-To: <20050918230733.GA29869@ftp.linux.org.uk>
On Mon, Sep 19, 2005 at 12:07:33AM +0100, Al Viro wrote:
> What's happening might be (and no, I haven't looked into the gcc codegenerator
> yet) as simple as too early conversion of assignment to memcpy() call, losing
> the "we don't really use the address of this sucker after initialization"
> in process.
Not quite. But failure to copy-propagate structures is a known problem.
It's on the to-do list. Hopefully the improved alias analysis to be done
for gcc 4.2 will make this task not suck.
*shrug*
r~
next prev parent reply other threads:[~2005-09-20 6:32 UTC|newest]
Thread overview: 49+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-09-18 10:06 p = kmalloc(sizeof(*p), ) Russell King
2005-09-18 11:04 ` Alan Cox
2005-09-18 14:39 ` Al Viro
2005-09-18 16:25 ` Denis Vlasenko
2005-09-18 17:30 ` Al Viro
2005-09-18 18:00 ` Willy Tarreau
2005-09-18 17:47 ` Alan Cox
2005-09-18 16:32 ` Robert Love
2005-09-18 16:52 ` Willy Tarreau
2005-09-18 17:18 ` Al Viro
2005-09-18 17:31 ` Linus Torvalds
2005-09-18 17:45 ` Al Viro
2005-09-18 20:34 ` Roman Zippel
2005-09-18 21:12 ` Al Viro
2005-09-18 21:52 ` Al Viro
2005-09-18 22:25 ` Linus Torvalds
2005-09-18 23:07 ` Al Viro
2005-09-20 6:31 ` Richard Henderson [this message]
2005-09-19 21:20 ` Matthias Urlichs
2005-09-19 21:28 ` Matthias Urlichs
2005-09-18 19:07 ` Al Viro
2005-09-18 21:30 ` Alan Cox
2005-09-18 21:14 ` Al Viro
2005-09-19 6:09 ` Coywolf Qi Hunt
2005-09-21 2:18 ` Miles Bader
2005-09-18 17:32 ` Randy.Dunlap
2005-09-19 6:47 ` Coywolf Qi Hunt
2005-09-20 8:53 ` Pekka Enberg
2005-09-20 9:39 ` Al Viro
2005-09-20 9:47 ` Pekka J Enberg
2005-09-20 9:53 ` Al Viro
2005-09-20 10:07 ` Pekka J Enberg
2005-09-20 15:14 ` Randy.Dunlap
2005-09-20 11:18 ` Pekka Enberg
2005-09-20 11:40 ` Russell King
2005-09-20 11:56 ` Denis Vlasenko
2005-09-20 12:20 ` Pekka J Enberg
2005-09-20 12:31 ` Russell King
2005-09-20 12:35 ` Pekka J Enberg
2005-09-20 15:21 ` Randy.Dunlap
2005-09-20 12:53 ` Pekka J Enberg
2005-09-20 17:11 ` Andrew Morton
2005-09-20 17:17 ` Russell King
2005-09-20 18:02 ` Alan Cox
2005-09-20 17:59 ` Andrew Morton
2005-09-20 18:11 ` Russell King
2005-09-20 18:41 ` Jeff Garzik
2005-09-20 20:41 ` Alan Cox
2005-09-20 19:41 ` Horst von Brand
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