From: Glauber Costa Date: Mon, 28 Nov 2011 16:45:19 +0000 (-0200) Subject: sched/accounting: Re-use scheduler statistics for the root cgroup X-Git-Tag: v3.3-rc1~191^2~9^2~9 X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=54c707e98de9ca899e6552a47c797c62c45885ee;p=pandora-kernel.git sched/accounting: Re-use scheduler statistics for the root cgroup Right now, after we collect tick statistics for user and system and store them in a well known location, we keep the same statistics again for cpuacct. Since cpuacct is hierarchical, the numbers for the root cgroup should be absolutely equal to the system-wide numbers. So it would be better to just use it: this patch changes cpuacct accounting in a way that the cpustat statistics are kept in a struct kernel_cpustat percpu array. In the root cgroup case, we just point it to the main array. The rest of the hierarchy walk can be totally disabled later with a static branch - but I am not doing it here. Signed-off-by: Glauber Costa Signed-off-by: Peter Zijlstra Cc: Paul Tuner Link: http://lkml.kernel.org/r/1322498719-2255-4-git-send-email-glommer@parallels.com Signed-off-by: Ingo Molnar --- Reading git-diff-tree failed