Re: [patch] as-iosched divide by zero fix

From: Steven Cole (
Date: Wed Jun 11 2003 - 20:54:31 EST

On Wed, 2003-06-11 at 19:10, Robert Love wrote:
> On Wed, 2003-06-11 at 17:24, Andrew Morton wrote:
> > Do you know what the actual oops is?
> I got it all figured out now.
> It is a divide by zero in update_write_batch() called from
> as_completed_request().
> > Odd that starting the X server triggers it. Be interesting if your patch
> > fixes things for Brian.
> I reproduced it without X.
> The divide by zero is on line 959 with the divide by 'write_time'. It
> can obviously be zero (see line 950). The divide by 'batch' on line 953
> seems safe.
> The correct patch is below.
> Most important question: why are only some of us seeing this?
> Robert Love

With regards to the last, here is an anti-AOL! for the oops. I ran
2.5.70-mm8 for several hours today, doing kernel compiles and running
dbench 64 on ext3, xfs, and jfs. No oops.

All while running X (although that now seems moot). Base distro is RH9
if that could matter. System is UP (PIII), PREEMPT, IDE, i810 chipset.


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