From: Tejun Heo Date: Wed, 9 Jan 2013 16:05:11 +0000 (-0800) Subject: cfq-iosched: convert cfq_group_slice() to use cfqg->vfraction X-Git-Tag: v3.9-rc1~44^2~12^2~11 X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=41cad6ab2cb9ccb3b11546ad56b8b285e47c6279;p=pandora-kernel.git cfq-iosched: convert cfq_group_slice() to use cfqg->vfraction 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 Acked-by: Vivek Goyal --- Reading git-diff-tree failed