On Tue 11-11-14 16:04:48, Steven Rostedt wrote:
> On Tue, 11 Nov 2014 21:15:39 +0100
> Jan Kara <[email protected]> wrote:
>
>
> > So I was looking into this but I have to say I don't understand where is
> > the problem. The registers clearly show that x_intercept - bdi_setpoint + 1
> > == 0 (in 32-bit arithmetics). Given:
> > x_intercept = bdi_setpoint + span
> >
> > We have that span + 1 == 0 and that means that:
> > ((thresh - bdi_thresh + 8 * write_bw) * (u64)x >> 16) == -1 (again in
> > 32-bit arithmetics). But I don't see how that can realistically happen...
> >
> > Is this reproducible at all?
> >
>
> Unfortunately not. It only happened once, and I haven't been able to
> reproduce it again.
BTW, how much memory does the machine have and what is
/proc/sys/vm/dirty_ratio and /proc/sys/vm/dirty_background_ratio (or
corresponding dirty_bytes, dirty_background_bytes if you are using them)?
Honza
--
Jan Kara <[email protected]>
SUSE Labs, CR
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