linux-kernel - [RFC][PATCH]: sched/fair: search a task from the tail of the queue

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Message-Id: <20170824104445.16827-1-urezki@gmail.com>
Date:   Thu, 24 Aug 2017 12:44:44 +0200
From:   "Uladzislau Rezki (Sony)" <urezki@...il.com>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Ingo Molnar <mingo@...hat.com>, Mike Galbraith <efault@....de>,
        Oleksiy Avramchenko <oleksiy.avramchenko@...ymobile.com>,
        Paul Turner <pjt@...gle.com>, Oleg Nesterov <oleg@...hat.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Mike Galbraith <umgwanakikbuti@...il.com>,
        Kirill Tkhai <tkhai@...dex.ru>,
        Tim Chen <tim.c.chen@...ux.intel.com>,
        Nicolas Pitre <nicolas.pitre@...aro.org>,
        "Uladzislau Rezki (Sony)" <urezki@...il.com>
Subject: [RFC][PATCH]: sched/fair: search a task from the tail of the queue

Hi,

while doing a load balancing (plus active) if we change a direction
of task search we may benefit when it comes to performance. See below
results of running hackbench with following parameters: 1000 samples 40 groups

[1] ftp://vps418301.ovh.net/incoming/hackbench_40_groups_1000_samples_default_patched_i5-3320M.png

Uladzislau Rezki (1):
  sched/fair: search a task from the tail of the queue

 kernel/sched/fair.c | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

-- 
2.11.0