[Xen-devel] Re: [PATCH] Avoid triggering the softlockup BUG when offline for too long.

[Keir Fraser <keir@xxxxxxxxxxxxx>]

On 29/11/06 12:08, "Glauber de Oliveira Costa" <gcosta@xxxxxxxxxx> wrote:

> [LINUX] Avoid triggering the softlockup BUG when offline for too long.
> 
> After being offline for a long time, the softlockup  watchdog triggers
> a BUG() on our faces. This is expected, as in fact, we spent more than
> a fixed 10*HZ amount of time without touching the watchdog.
> 
> However, by inspecting the contents of stolen inside timer irq handler,
> we can gain awareness of the fact, and do better than that.
> This patch fixes it.

Thanks. I changed the threshold to 5*HZ just to avoid marginal cases where
we might be offlined for just less than 10 seconds, and then if the per-cpu
watchdog process hasn't run for a second or two before we were offlined then
that would push us over the edge to print a warning. 5*HZ is much more
comfortable.

 -- Keir


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