linux-kernel - Re: frequent lockups in 3.18rc4

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Message-ID: <547E5895.9040405@oracle.com>
Date:	Tue, 02 Dec 2014 19:25:57 -0500
From:	Sasha Levin <sasha.levin@...cle.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...nel.org>
CC:	Dave Jones <davej@...hat.com>, Chris Mason <clm@...com>,
	Dâniel Fraga <fragabr@...il.com>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: frequent lockups in 3.18rc4

On 12/02/2014 07:09 PM, Linus Torvalds wrote:
> On Tue, Dec 2, 2014 at 3:32 PM, Sasha Levin <sasha.levin@...cle.com> wrote:
>> >
>> > I've disabled lock debugging to see if anything new will show up, and hit
>> > something that may be related:
> Very interesting. But your source code doesn't match mine - can you
> say what that
> 
>     kernel/sched/fair.c:4541:17
> 
> line is?


Sorry about that, I'm testing on the -next kernel. The relevant code snippet is
in wake_affine:

        prev_eff_load = 100 + (sd->imbalance_pct - 100) / 2;
        prev_eff_load *= capacity_of(this_cpu);

        if (this_load > 0) {
                this_eff_load *= this_load +
                        effective_load(tg, this_cpu, weight, weight);  <==== This one

                prev_eff_load *= load + effective_load(tg, prev_cpu, 0, weight);
        }


Thanks,
Sasha
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