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

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Message-ID: <1470052348.5903.6.camel@gmail.com>
Date:	Mon, 01 Aug 2016 13:52:28 +0200
From:	Mike Galbraith <umgwanakikbuti@...il.com>
To:	Wanpeng Li <kernellwp@...il.com>
Cc:	Peter Zijlstra <peterz@...radead.org>,
	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 17:56 +0800, Wanpeng Li wrote:
> 2016-08-01 17:31 GMT+08:00 Mike Galbraith <umgwanakikbuti@...il.com>:
> > 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);
> >         ....
> 
> Thanks Mike, so here "is hashed" means that add to list instead of 
> real hashing.

Yeah.

	-Mike