Re: msleep_interruptible vs msleep

[Arnd Bergmann]

Am Monday 04 September 2006 21:29 schrieb matthieu castet:
>
> But why if I have a kernel thread that do [1] :
>
> while (true) {
> Do some stuff
> msleep(1000)
> }
>
> the load average is high (near 100%).
>
> and if I use msleep_interruptible the load average is normal.

These are the traditional semantics of incorruptible vs. noninterruptible
sleep. A process that sleep noninterruptible contributes to the load
average but does not consume actual CPU cycles.

I guess you can take that as a hint that the code you're describing
above is a bad thing to do.

> Does the same applies to wait_event_timeout vs
> wait_event_interruptible_timeout ?

yes.

	Arnd <><
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/