Modern production environment could use hundreds of cgroup to control the resources for different workloads, along with the complicated resource binding. On NUMA platforms where we have multiple nodes, things become even more complicated, we hope there are more local memory access to improve the performance, and NUMA Balancing keep working hard to achieve that, however, wrong memory policy or node binding could easily waste the effort, result a lot of remote page accessing. We need to perceive such problems, then we got chance to fix it before there are too much damages, however, there are no good approach yet to help catch the mouse who introduced the remote access. This patch set is trying to fill in the missing pieces， by introduce the per-cgroup NUMA locality/exectime statistics, and expose the per-task page migration failure counter, with these statistics, we could achieve the daily monitoring on NUMA efficiency, to give warning when things going too wrong. Please check the third patch for more details. Thanks to Peter, Mel and Michal for the good advices :-) Michael Wang (3): sched/numa: advanced per-cgroup numa statistic sched/numa: expose per-task pages-migration-failure counter sched/numa: documentation for per-cgroup numa stat Documentation/admin-guide/cg-numa-stat.rst | 161 ++++++++++++++++++++++++ Documentation/admin-guide/kernel-parameters.txt | 4 + Documentation/admin-guide/sysctl/kernel.rst | 9 ++ include/linux/sched.h | 18 ++- include/linux/sched/sysctl.h | 6 + init/Kconfig | 9 ++ kernel/sched/core.c | 91 ++++++++++++++ kernel/sched/debug.c | 1 + kernel/sched/fair.c | 33 +++++ kernel/sched/sched.h | 17 +++ kernel/sysctl.c | 11 ++ 11 files changed, 359 insertions(+), 1 deletion(-) create mode 100644 Documentation/admin-guide/cg-numa-stat.rst -- 2.14.4.44.g2045bb6
