From: Duncan Sands <baldrick@wanadoo.fr>
To: "Martin J. Bligh" <mbligh@aracnet.com>, Andrew Morton <akpm@digeo.com>
Cc: linux-kernel <linux-kernel@vger.kernel.org>
Subject: Re: BUGed to death
Date: Mon, 14 Apr 2003 22:40:41 +0200 [thread overview]
Message-ID: <200304142240.41999.baldrick@wanadoo.fr> (raw)
In-Reply-To: <80690000.1050351598@flay>
On Monday 14 April 2003 22:19, Martin J. Bligh wrote:
> Seems all these bug checks are fairly expensive. I can get 1%
> back on system time for kernel compiles by changing BUG to
> "do {} while (0)" to make them all compile away. Profiles aren't
> very revealing though ... seems to be within experimental error ;-(
>
> I was pondering CONFIG_RUN_WILD_NAKED_AND_FREE, but maybe we can
> just nail a few of the hottest path ones instead (I think you did
> a couple already recently). I guess that suggestion isn't much
> use without more profile data though ;-)
You would think that the compiler would consider a branch leading to
ud2 (i.e. BUG()) to be "unlikely", but it doesn't seem to. Maybe some
improvement can be made there.
All the best,
Duncan.
PS: gcc 3.2.3
next prev parent reply other threads:[~2003-04-14 20:29 UTC|newest]
Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-04-14 20:19 BUGed to death Martin J. Bligh
2003-04-14 20:40 ` Duncan Sands [this message]
2003-04-14 21:02 ` Dave Jones
2003-04-14 21:10 ` Duncan Sands
2003-04-14 21:17 ` Dave Jones
2003-04-15 11:57 ` Duncan Sands
2003-04-15 12:05 ` Dave Jones
2003-04-15 14:39 ` Martin J. Bligh
2003-04-23 15:08 ` Duncan Sands
2003-04-14 21:00 ` Dave Jones
2003-04-14 20:55 ` Martin J. Bligh
2003-04-14 21:08 ` Dave Jones
2003-04-14 21:50 ` Andrew Morton
2003-04-14 21:55 ` Dave Jones
2003-04-15 0:23 ` H. Peter Anvin
2003-04-15 12:01 ` Duncan Sands
2003-04-15 12:31 ` Jens Axboe
2003-04-15 12:36 ` Dave Jones
2003-04-15 12:40 ` Jens Axboe
2003-04-15 12:49 ` Sean Neakums
2003-04-15 12:52 ` Sean Neakums
2003-04-15 13:01 ` Roman Zippel
2003-04-15 13:17 ` Jens Axboe
2003-04-15 13:55 ` Duncan Sands
2003-04-15 14:22 ` Jens Axboe
2003-04-15 14:35 ` Martin J. Bligh
2003-04-15 14:39 ` Duncan Sands
2003-04-15 14:45 ` Martin J. Bligh
2003-04-15 14:58 ` Duncan Sands
-- strict thread matches above, loose matches on Subject: below --
2003-04-15 14:30 rwhron
2003-04-15 15:57 ` Dave Jones
2003-04-15 16:11 ` Nick Piggin
2003-04-15 16:42 ` Michael Buesch
2003-04-15 16:45 ` Dave Jones
2003-04-15 18:33 Chuck Ebbert
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