linux-kernel - Re: [PATCH RESEND] sched: prefer an idle cpu vs an idle sibling for BALANCE

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <1434588939.3444.25.camel@gmail.com>
Date:	Thu, 18 Jun 2015 02:55:39 +0200
From:	Mike Galbraith <umgwanakikbuti@...il.com>
To:	Josef Bacik <jbacik@...com>
Cc:	Peter Zijlstra <peterz@...radead.org>, riel@...hat.com,
	mingo@...hat.com, linux-kernel@...r.kernel.org,
	morten.rasmussen@....com
Subject: Re: [PATCH RESEND] sched: prefer an idle cpu vs an idle sibling for
 BALANCE_WAKE

On Wed, 2015-06-17 at 11:06 -0700, Josef Bacik wrote:
> On 06/11/2015 10:35 PM, Mike Galbraith wrote:
> > On Thu, 2015-05-28 at 13:05 +0200, Peter Zijlstra wrote:

> > If sd == NULL, we fall through and try to pull wakee despite nacked-by
> > tsk_cpus_allowed() or wake_affine().
> >
> 
> So maybe add a check in the if (sd_flag & SD_BALANCE_WAKE) for something 
> like this
> 
> if (tmp >= 0) {
> 	new_cpu = tmp;
> 	goto unlock;
> } else if (!want_affine) {
> 	new_cpu = prev_cpu;
> }
> 
> so we can make sure we're not being pushed onto a cpu that we aren't 
> allowed on?  Thanks,

The buglet is a messenger methinks.  You saying the patch helped without
SD_BALANCE_WAKE being set is why I looked.  The buglet would seem to say
that preferring cache is not harming your load after all.  It now sounds
as though wake_wide() may be what you're squabbling with.

Things aren't adding up all that well.

	-Mike

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/