Hi Luca, On 17/12/14 10:50, Luca Abeni wrote: > Hi all, > > I noticed some discrepancies between the schedule produced > by SCHED_DEADLINE and the expectations from real-time > scheduling theory. After some investigations, it turned out > that such discrepancies are due to two bugs in deadline.c, > which are particularly visible when using global scheduling > on multiple CPUs (see the two patches for more details). > > I think the first bug (fixed in patch 0001) is particularly > critical, because it causes a violation of the SCHED_DEADLINE > guarantee (if the total load is smaller than the number of > CPUs, there is an upper bound for the response times. This is > a well known property for global EDF, but is not respected by > SCHED_DEADLINE - see patch 0001 for more details). > The second patch is IMHO also important, but less critical. >
I already reviewed and tested them. They looks ok and are important fixes. ACK for both. :) Thanks a lot! - Juri > Luca Abeni (2): > Fix migration of SCHED_DEADLINE tasks > Avoid double-accounting in case of missed deadlines > > kernel/sched/deadline.c | 25 ++++--------------------- > 1 file changed, 4 insertions(+), 21 deletions(-) > -- 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/
