On Fri, Dec 28, 2012 at 12:35:36PM -0800, Tejun Heo wrote: > cfq_group_slice() calculates slice by taking a fraction of > cfq_target_latency according to the ratio of cfqg->weight against > service_tree->total_weight. This currently works only because all > cfqgs are treated to be at the same level. > > To prepare for proper hierarchy support, convert cfq_group_slice() to > base the calculation on cfqg->vfraction. As cfqg->vfraction is always > a fraction of 1 and represents the fraction allocated to the cfqg with > hierarchy considered, the slice can be simply calculated by > multiplying cfqg->vfraction to cfq_target_latency (with fixed point > shift factored in). > > As vfraction calculation currently treats all non-root cfqgs as > children of the root cfqg, this patch doesn't introduce noticeable > behavior difference. > > Signed-off-by: Tejun Heo <t...@kernel.org>
Acked-by: Vivek Goyal <vgo...@redhat.com> Vivek -- 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/
