From: Andi Kleen <ak@muc.de>
To: Andrew Morton <akpm@osdl.org>
Cc: Jeremy Fitzhardinge <jeremy@goop.org>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH] Put the BUG __FILE__ and __LINE__ info out of line
Date: 28 Sep 2006 12:15:55 +0200
Date: Thu, 28 Sep 2006 12:15:55 +0200 [thread overview]
Message-ID: <20060928101555.GA99906@muc.de> (raw)
In-Reply-To: <20060928002610.05e61321.akpm@osdl.org>
On Thu, Sep 28, 2006 at 12:26:10AM -0700, Andrew Morton wrote:
> On 28 Sep 2006 09:17:31 +0200
> Andi Kleen <ak@muc.de> wrote:
>
> > > Plan #17 is to just put the BUG inline and then put the EIP+file*+line into
> > > a separate section, then search that section at BUG time to find the record
> > > whose EIP points back at this ud2a.
> > >
> > > It's a bit messy for modules, but it minimises the .text impact and keeps
> > > disassembly happy, no?
> > >
> > > And if done right it can probably be used by other architectures.
> >
> >
> > The way x86-64 solved it was to turn the inline code into valid
> > instructions. This can be done with two additional bytes.
> > IMHO that's the right solution for the problem on i386 too
> >
>
> That uses even more text.
But no out of line section. So overall it's smaller, although the cache footprint
is 2 bytes larger. But then is 2 bytes larger really an issue? We don't have
_that_ many BUGs anyways.
I'll port the x86-64 way over to i386
-Andi
next prev parent reply other threads:[~2006-09-28 10:15 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-09-28 6:00 [PATCH] Put the BUG __FILE__ and __LINE__ info out of line Jeremy Fitzhardinge
2006-09-28 6:35 ` Andrew Morton
2006-09-28 6:49 ` Jeremy Fitzhardinge
2006-09-28 7:00 ` Andrew Morton
2006-09-28 7:17 ` Andi Kleen
2006-09-28 7:26 ` Andrew Morton
2006-09-28 10:15 ` Andi Kleen [this message]
2006-09-28 10:30 ` Jeremy Fitzhardinge
2006-09-28 10:38 ` Andi Kleen
2006-09-28 15:30 ` Hugh Dickins
2006-09-28 19:44 ` Andi Kleen
2006-09-28 10:27 ` Jeremy Fitzhardinge
2006-09-28 16:18 ` Andrew Morton
2006-09-28 16:32 ` Jeremy Fitzhardinge
2006-09-28 7:16 ` Andi Kleen
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