On Thu, 7 Nov 2013, Frederic Weisbecker wrote: > usermodehelper works are created via workqueues, right? And workqueues are an > issue as > well for those who want CPU isolation.
AFAICT usermodehelper can be called from a variety of contexts. > So this looks like a more general problem than just call_usermodehelper. Well the code explicitly sets the the affinity mask to all cpus which creates a problem for low latency processors. It does not inherit the affinity from any calling process. > Last time I checked, it seemed to me that this is an unbound workqueue? If so > can't we tune > the affinity of this workqueue? If not perhaps that's something we want to > solve and which > could be useful for all the users who don't want their CPU to be disturbed. There are various contexts from which usermodehelper can be called. Drivers use it etc. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
