linux-kernel - [PATCH 0/6] move update blocked load outside newidle

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Date:   Fri,  5 Feb 2021 12:48:24 +0100
From:   Vincent Guittot <vincent.guittot@...aro.org>
To:     mingo@...hat.com, peterz@...radead.org, juri.lelli@...hat.com,
        dietmar.eggemann@....com, rostedt@...dmis.org, bsegall@...gle.com,
        mgorman@...e.de, fweisbec@...il.com, tglx@...utronix.de,
        bristot@...hat.com, linux-kernel@...r.kernel.org,
        joel@...lfernandes.org
Cc:     qais.yousef@....com, Vincent Guittot <vincent.guittot@...aro.org>
Subject: [PATCH 0/6] move update blocked load outside newidle_balance

Joel reported long preempt and irq off sequence in newidle_balance because
of a large number of cgroups in used and having to be updated. This
patchset moves the update outside newidle_imblance in order to enable
early abort during the updates in case of pending irq as an example.

Instead of kicking a normal ILB that will wakes up CPU which is already
idle, patch 5 triggers the update of statistics in the idle thread of
the CPU before selecting and entering an idle state.

Vincent Guittot (6):
  sched/fair: remove update of blocked load from newidle_balance
  sched/fair: remove unused parameter of update_nohz_stats
  sched/fair: merge for each idle cpu loop of ILB
  sched/fair: reorder newidle_balance pulled_task test
  sched/fair: trigger the update of blocked load on newly idle cpu
  sched/fair: reduce the window for duplicated update

 include/linux/sched/nohz.h |   2 +
 kernel/sched/fair.c        | 100 +++++++++++--------------------------
 kernel/sched/idle.c        |   6 +++
 3 files changed, 38 insertions(+), 70 deletions(-)

-- 
2.17.1