linux-kernel - [RFC PATCH v2 00/17] Core scheduling v2

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Date:   Tue, 23 Apr 2019 16:18:05 +0000
From:   Vineeth Remanan Pillai <vpillai@...italocean.com>
To:     Nishanth Aravamudan <naravamudan@...italocean.com>,
        Julien Desfossez <jdesfossez@...italocean.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Tim Chen <tim.c.chen@...ux.intel.com>, mingo@...nel.org,
        tglx@...utronix.de, pjt@...gle.com, torvalds@...ux-foundation.org
Cc:     Vineeth Remanan Pillai <vpillai@...italocean.com>,
        linux-kernel@...r.kernel.org, subhra.mazumdar@...cle.com,
        fweisbec@...il.com, keescook@...omium.org, kerrnel@...gle.com,
        Phil Auld <pauld@...hat.com>, Aaron Lu <aaron.lwe@...il.com>,
        Aubrey Li <aubrey.intel@...il.com>,
        Valentin Schneider <valentin.schneider@....com>,
        Mel Gorman <mgorman@...hsingularity.net>,
        Pawan Gupta <pawan.kumar.gupta@...ux.intel.com>,
        Paolo Bonzini <pbonzini@...hat.com>
Subject: [RFC PATCH v2 00/17] Core scheduling v2

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