linux-kernel - Re: [PATCH 4/4] sched,fair: Fix PELT integrity for new tasks

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Message-ID: <1470043872.5903.5.camel@gmail.com>
Date:	Mon, 01 Aug 2016 11:31:12 +0200
From:	Mike Galbraith <umgwanakikbuti@...il.com>
To:	Wanpeng Li <kernellwp@...il.com>,
	Peter Zijlstra <peterz@...radead.org>
Cc:	Yuyang Du <yuyang.du@...el.com>, Ingo Molnar <mingo@...nel.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Benjamin Segall <bsegall@...gle.com>,
	Paul Turner <pjt@...gle.com>,
	Morten Rasmussen <morten.rasmussen@....com>,
	Dietmar Eggemann <dietmar.eggemann@....com>,
	Matt Fleming <matt@...eblueprint.co.uk>,
	Vincent Guittot <vincent.guittot@...aro.org>
Subject: Re: [PATCH 4/4] sched,fair: Fix PELT integrity for new tasks

On Mon, 2016-08-01 at 15:30 +0800, Wanpeng Li wrote:

> What's the meaning of "the task is hashed before we call
> wake_up_new_task()"?

See fork.c::copy_process()

        /*
         * Make it visible to the rest of the system, but dont wake it up yet.
         * Need tasklist lock for parent etc handling!
         */
        write_lock_irq(&tasklist_lock);
        ....