linux-kernel - [PATCH RFC v2] Fix race window during idle cpu selection.

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Message-Id: <1512500947-24444-1-git-send-email-atish.patra@oracle.com>
Date:   Tue,  5 Dec 2017 13:09:06 -0600
From:   Atish Patra <atish.patra@...cle.com>
To:     linux-kernel@...r.kernel.org
Cc:     joelaf@...gle.com, jbacik@...com, mingo@...hat.com,
        peterz@...radead.org, efault@....de, urezki@...il.com,
        atish.patra@...cle.com
Subject: [PATCH RFC v2] Fix race window during idle cpu selection. 

This patch tries to fix a possible race window that lets multiple
tasks wakeup on the same cpu. schbench, uperf & Jackbench (Android)
mostly showed improvements while none of the other standard benchmarks
have shown any regression.

changes from v1->v2:
1. Added the performance numbers.
2. Did not include the debug patch.
   It can still be found at 
   https://lkml.org/lkml/2017/10/31/16

Atish Patra (1):
  sched: Minimize the idle cpu selection race window.

 kernel/sched/core.c      |  4 ++++
 kernel/sched/fair.c      | 12 +++++++++---
 kernel/sched/idle_task.c |  1 +
 kernel/sched/sched.h     |  1 +
 4 files changed, 15 insertions(+), 3 deletions(-)

-- 
2.7.4