Second iteration of the core-scheduling feature. This version fixes apparent bugs and performance issues in v1. This doesn't fully address the issue of core sharing between processes with different tags. Core sharing still happens 1% to 5% of the time based on the nature of workload and timing of the runnable processes.
Changes in v2 ------------- - rebased on mainline commit: 6d906f99817951e2257d577656899da02bb33105 - Fixes for couple of NULL pointer dereference crashes - Subhra Mazumdar - Tim Chen - Improves priority comparison logic for process in different cpus - Peter Zijlstra - Aaron Lu - Fixes a hard lockup in rq locking - Vineeth Pillai - Julien Desfossez - Fixes a performance issue seen on IO heavy workloads - Vineeth Pillai - Julien Desfossez - Fix for 32bit build - Aubrey Li Issues ------ - Processes with different tags can still share the core - A crash when disabling cpus with core-scheduling on - https://paste.debian.net/plainh/fa6bcfa8 --- Peter Zijlstra (16): stop_machine: Fix stop_cpus_in_progress ordering sched: Fix kerneldoc comment for ia64_set_curr_task sched: Wrap rq::lock access sched/{rt,deadline}: Fix set_next_task vs pick_next_task sched: Add task_struct pointer to sched_class::set_curr_task sched/fair: Export newidle_balance() sched: Allow put_prev_task() to drop rq->lock sched: Rework pick_next_task() slow-path sched: Introduce sched_class::pick_task() sched: Core-wide rq->lock sched: Basic tracking of matching tasks sched: A quick and dirty cgroup tagging interface sched: Add core wide task selection and scheduling. sched/fair: Add a few assertions sched: Trivial forced-newidle balancer sched: Debug bits... Vineeth Remanan Pillai (1): sched: Wake up sibling if it has something to run include/linux/sched.h | 9 +- kernel/Kconfig.preempt | 7 +- kernel/sched/core.c | 800 +++++++++++++++++++++++++++++++++++++-- kernel/sched/cpuacct.c | 12 +- kernel/sched/deadline.c | 99 +++-- kernel/sched/debug.c | 4 +- kernel/sched/fair.c | 137 +++++-- kernel/sched/idle.c | 42 +- kernel/sched/pelt.h | 2 +- kernel/sched/rt.c | 96 +++-- kernel/sched/sched.h | 185 ++++++--- kernel/sched/stop_task.c | 35 +- kernel/sched/topology.c | 4 +- kernel/stop_machine.c | 2 + 14 files changed, 1145 insertions(+), 289 deletions(-) -- 2.17.1
