linux-kernel - [PATCH v2 0/1] wait_task_inactive() spend too much time on system startup

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Message-Id: <20200305095948.10873-1-cl@rock-chips.com>
Date:   Thu,  5 Mar 2020 17:59:47 +0800
From:   <cl@...k-chips.com>
To:     heiko@...ech.de
Cc:     mingo@...hat.com, peterz@...radead.org, juri.lelli@...hat.com,
        vincent.guittot@...aro.org, dietmar.eggemann@....com,
        rostedt@...dmis.org, bsegall@...gle.com, mgorman@...e.de,
        akpm@...ux-foundation.org, tglx@...utronix.de, mpe@...erman.id.au,
        surenb@...gle.com, ben.dooks@...ethink.co.uk,
        anshuman.khandual@....com, catalin.marinas@....com,
        will@...nel.org, keescook@...omium.org, luto@...capital.net,
        wad@...omium.org, mark.rutland@....com, geert+renesas@...der.be,
        george_davis@...tor.com, sudeep.holla@....com,
        linux@...linux.org.uk, gregkh@...uxfoundation.org, info@...ux.net,
        kstewart@...uxfoundation.org, allison@...utok.net,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        huangtao@...k-chips.com, Liang Chen <cl@...k-chips.com>
Subject: [PATCH v2 0/1] wait_task_inactive() spend too much time on system startup

From: Liang Chen <cl@...k-chips.com>

Changelog:
v1: wait_task_inactive() frequently call schedule_hrtimeout() and spend a lot of time,
i am trying to optimize it on rockchip platform.
v2: Use atomic_flags(PFA) instead of TIF flag, and add some comments.

Liang Chen (1):
  sched/fair: do not preempt current task if it is going to call
    schedule()

 include/linux/sched.h |  5 +++++
 kernel/kthread.c      |  4 ++++
 kernel/sched/fair.c   | 13 +++++++++++++
 3 files changed, 22 insertions(+)

-- 
2.17.1