On Sat, 05 Jan 2008 21:18:52 +1100 Benjamin Herrenschmidt <[EMAIL PROTECTED]> wrote:
> On Sat, 2008-01-05 at 02:04 -0800, Robin H. Johnson wrote: > > On Sat, Jan 05, 2008 at 01:30:37AM -0800, Andrew Morton wrote: > > > >From that I'd suspect that kwindfarm is being a bad citizen. > > > If a process is consistently stuck in D state, run > > Windfarm. > > It's an unfortunate artifact that kernel threads that do > non-interruptible sleep are counted as load... > > In the case of windfarm, it does a lot (a _LOT_) of accesses to various > i2c busses and the SMU (the system management unit which controls the > fans). All those are done in the form of short requests during which the > process is doing a wait_for_completion() or similar. > > I don't see a better way to do that, I think we could have good use of > something that stops counting those in the load average... Maybe, but we can usually work around it pretty comfortably. If smu_set_fan() is only ever called by a kernel thread then we can simply flip it over to using wait_for_completion_interruptible(). If smu_set_fan() is also called from user processes then things aren't so easy... -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/